+++ /dev/null
-/* Constant folding for calls to built-in and internal functions.
- Copyright (C) 1988-2015 Free Software Foundation, Inc.
-
-This file is part of GCC.
-
-GCC is free software; you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by the Free
-Software Foundation; either version 3, or (at your option) any later
-version.
-
-GCC is distributed in the hope that it will be useful, but WITHOUT ANY
-WARRANTY; without even the implied warranty of MERCHANTABILITY or
-FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
-for more details.
-
-You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING3. If not see
-<http://www.gnu.org/licenses/>. */
-
-#include "config.h"
-#include "system.h"
-#include "coretypes.h"
-#include "realmpfr.h"
-#include "tree.h"
-#include "stor-layout.h"
-#include "options.h"
-#include "fold-const.h"
-#include "fold-const-call.h"
-#include "tm.h" /* For C[LT]Z_DEFINED_AT_ZERO. */
-
-/* Functions that test for certain constant types, abstracting away the
- decision about whether to check for overflow. */
-
-static inline bool
-integer_cst_p (tree t)
-{
- return TREE_CODE (t) == INTEGER_CST && !TREE_OVERFLOW (t);
-}
-
-static inline bool
-real_cst_p (tree t)
-{
- return TREE_CODE (t) == REAL_CST && !TREE_OVERFLOW (t);
-}
-
-static inline bool
-complex_cst_p (tree t)
-{
- return TREE_CODE (t) == COMPLEX_CST;
-}
-
-/* Return true if ARG is a constant in the range of the host size_t.
- Store it in *SIZE_OUT if so. */
-
-static inline bool
-host_size_t_cst_p (tree t, size_t *size_out)
-{
- if (integer_cst_p (t)
- && wi::min_precision (t, UNSIGNED) <= sizeof (size_t) * CHAR_BIT)
- {
- *size_out = tree_to_uhwi (t);
- return true;
- }
- return false;
-}
-
-/* RES is the result of a comparison in which < 0 means "less", 0 means
- "equal" and > 0 means "more". Canonicalize it to -1, 0 or 1 and
- return it in type TYPE. */
-
-static inline tree
-build_cmp_result (tree type, int res)
-{
- return build_int_cst (type, res < 0 ? -1 : res > 0 ? 1 : 0);
-}
-
-/* M is the result of trying to constant-fold an expression (starting
- with clear MPFR flags) and INEXACT says whether the result in M is
- exact or inexact. Return true if M can be used as a constant-folded
- result in format FORMAT, storing the value in *RESULT if so. */
-
-static bool
-do_mpfr_ckconv (real_value *result, mpfr_srcptr m, bool inexact,
- const real_format *format)
-{
- /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
- overflow/underflow occurred. If -frounding-math, proceed iff the
- result of calling FUNC was exact. */
- if (!mpfr_number_p (m)
- || mpfr_overflow_p ()
- || mpfr_underflow_p ()
- || (flag_rounding_math && inexact))
- return false;
-
- REAL_VALUE_TYPE tmp;
- real_from_mpfr (&tmp, m, format, GMP_RNDN);
-
- /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values.
- If the REAL_VALUE_TYPE is zero but the mpft_t is not, then we
- underflowed in the conversion. */
- if (!real_isfinite (&tmp)
- || ((tmp.cl == rvc_zero) != (mpfr_zero_p (m) != 0)))
- return false;
-
- real_convert (result, format, &tmp);
- return real_identical (result, &tmp);
-}
-
-/* Try to evaluate:
-
- *RESULT = f (*ARG)
-
- in format FORMAT, given that FUNC is the MPFR implementation of f.
- Return true on success. */
-
-static bool
-do_mpfr_arg1 (real_value *result,
- int (*func) (mpfr_ptr, mpfr_srcptr, mpfr_rnd_t),
- const real_value *arg, const real_format *format)
-{
- /* To proceed, MPFR must exactly represent the target floating point
- format, which only happens when the target base equals two. */
- if (format->b != 2 || !real_isfinite (arg))
- return false;
-
- int prec = format->p;
- mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN;
- mpfr_t m;
-
- mpfr_init2 (m, prec);
- mpfr_from_real (m, arg, GMP_RNDN);
- mpfr_clear_flags ();
- bool inexact = func (m, m, rnd);
- bool ok = do_mpfr_ckconv (result, m, inexact, format);
- mpfr_clear (m);
-
- return ok;
-}
-
-/* Try to evaluate:
-
- *RESULT_SIN = sin (*ARG);
- *RESULT_COS = cos (*ARG);
-
- for format FORMAT. Return true on success. */
-
-static bool
-do_mpfr_sincos (real_value *result_sin, real_value *result_cos,
- const real_value *arg, const real_format *format)
-{
- /* To proceed, MPFR must exactly represent the target floating point
- format, which only happens when the target base equals two. */
- if (format->b != 2 || !real_isfinite (arg))
- return false;
-
- int prec = format->p;
- mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN;
- mpfr_t m, ms, mc;
-
- mpfr_inits2 (prec, m, ms, mc, NULL);
- mpfr_from_real (m, arg, GMP_RNDN);
- mpfr_clear_flags ();
- bool inexact = mpfr_sin_cos (ms, mc, m, rnd);
- bool ok = (do_mpfr_ckconv (result_sin, ms, inexact, format)
- && do_mpfr_ckconv (result_cos, mc, inexact, format));
- mpfr_clears (m, ms, mc, NULL);
-
- return ok;
-}
-
-/* Try to evaluate:
-
- *RESULT = f (*ARG0, *ARG1)
-
- in format FORMAT, given that FUNC is the MPFR implementation of f.
- Return true on success. */
-
-static bool
-do_mpfr_arg2 (real_value *result,
- int (*func) (mpfr_ptr, mpfr_srcptr, mpfr_srcptr, mpfr_rnd_t),
- const real_value *arg0, const real_value *arg1,
- const real_format *format)
-{
- /* To proceed, MPFR must exactly represent the target floating point
- format, which only happens when the target base equals two. */
- if (format->b != 2 || !real_isfinite (arg0) || !real_isfinite (arg1))
- return false;
-
- int prec = format->p;
- mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN;
- mpfr_t m0, m1;
-
- mpfr_inits2 (prec, m0, m1, NULL);
- mpfr_from_real (m0, arg0, GMP_RNDN);
- mpfr_from_real (m1, arg1, GMP_RNDN);
- mpfr_clear_flags ();
- bool inexact = func (m0, m0, m1, rnd);
- bool ok = do_mpfr_ckconv (result, m0, inexact, format);
- mpfr_clears (m0, m1, NULL);
-
- return ok;
-}
-
-/* Try to evaluate:
-
- *RESULT = f (ARG0, *ARG1)
-
- in format FORMAT, given that FUNC is the MPFR implementation of f.
- Return true on success. */
-
-static bool
-do_mpfr_arg2 (real_value *result,
- int (*func) (mpfr_ptr, long, mpfr_srcptr, mp_rnd_t),
- const wide_int_ref &arg0, const real_value *arg1,
- const real_format *format)
-{
- if (format->b != 2 || !real_isfinite (arg1))
- return false;
-
- int prec = format->p;
- mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN;
- mpfr_t m;
-
- mpfr_init2 (m, prec);
- mpfr_from_real (m, arg1, GMP_RNDN);
- mpfr_clear_flags ();
- bool inexact = func (m, arg0.to_shwi (), m, rnd);
- bool ok = do_mpfr_ckconv (result, m, inexact, format);
- mpfr_clear (m);
-
- return ok;
-}
-
-/* Try to evaluate:
-
- *RESULT = f (*ARG0, *ARG1, *ARG2)
-
- in format FORMAT, given that FUNC is the MPFR implementation of f.
- Return true on success. */
-
-static bool
-do_mpfr_arg3 (real_value *result,
- int (*func) (mpfr_ptr, mpfr_srcptr, mpfr_srcptr,
- mpfr_srcptr, mpfr_rnd_t),
- const real_value *arg0, const real_value *arg1,
- const real_value *arg2, const real_format *format)
-{
- /* To proceed, MPFR must exactly represent the target floating point
- format, which only happens when the target base equals two. */
- if (format->b != 2
- || !real_isfinite (arg0)
- || !real_isfinite (arg1)
- || !real_isfinite (arg2))
- return false;
-
- int prec = format->p;
- mp_rnd_t rnd = format->round_towards_zero ? GMP_RNDZ : GMP_RNDN;
- mpfr_t m0, m1, m2;
-
- mpfr_inits2 (prec, m0, m1, m2, NULL);
- mpfr_from_real (m0, arg0, GMP_RNDN);
- mpfr_from_real (m1, arg1, GMP_RNDN);
- mpfr_from_real (m2, arg2, GMP_RNDN);
- mpfr_clear_flags ();
- bool inexact = func (m0, m0, m1, m2, rnd);
- bool ok = do_mpfr_ckconv (result, m0, inexact, format);
- mpfr_clears (m0, m1, m2, NULL);
-
- return ok;
-}
-
-/* M is the result of trying to constant-fold an expression (starting
- with clear MPFR flags) and INEXACT says whether the result in M is
- exact or inexact. Return true if M can be used as a constant-folded
- result in which the real and imaginary parts have format FORMAT.
- Store those parts in *RESULT_REAL and *RESULT_IMAG if so. */
-
-static bool
-do_mpc_ckconv (real_value *result_real, real_value *result_imag,
- mpc_srcptr m, bool inexact, const real_format *format)
-{
- /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
- overflow/underflow occurred. If -frounding-math, proceed iff the
- result of calling FUNC was exact. */
- if (!mpfr_number_p (mpc_realref (m))
- || !mpfr_number_p (mpc_imagref (m))
- || mpfr_overflow_p ()
- || mpfr_underflow_p ()
- || (flag_rounding_math && inexact))
- return false;
-
- REAL_VALUE_TYPE tmp_real, tmp_imag;
- real_from_mpfr (&tmp_real, mpc_realref (m), format, GMP_RNDN);
- real_from_mpfr (&tmp_imag, mpc_imagref (m), format, GMP_RNDN);
-
- /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values.
- If the REAL_VALUE_TYPE is zero but the mpft_t is not, then we
- underflowed in the conversion. */
- if (!real_isfinite (&tmp_real)
- || !real_isfinite (&tmp_imag)
- || (tmp_real.cl == rvc_zero) != (mpfr_zero_p (mpc_realref (m)) != 0)
- || (tmp_imag.cl == rvc_zero) != (mpfr_zero_p (mpc_imagref (m)) != 0))
- return false;
-
- real_convert (result_real, format, &tmp_real);
- real_convert (result_imag, format, &tmp_imag);
-
- return (real_identical (result_real, &tmp_real)
- && real_identical (result_imag, &tmp_imag));
-}
-
-/* Try to evaluate:
-
- RESULT = f (ARG)
-
- in format FORMAT, given that FUNC is the mpc implementation of f.
- Return true on success. Both RESULT and ARG are represented as
- real and imaginary pairs. */
-
-static bool
-do_mpc_arg1 (real_value *result_real, real_value *result_imag,
- int (*func) (mpc_ptr, mpc_srcptr, mpc_rnd_t),
- const real_value *arg_real, const real_value *arg_imag,
- const real_format *format)
-{
- /* To proceed, MPFR must exactly represent the target floating point
- format, which only happens when the target base equals two. */
- if (format->b != 2
- || !real_isfinite (arg_real)
- || !real_isfinite (arg_imag))
- return false;
-
- int prec = format->p;
- mpc_rnd_t crnd = format->round_towards_zero ? MPC_RNDZZ : MPC_RNDNN;
- mpc_t m;
-
- mpc_init2 (m, prec);
- mpfr_from_real (mpc_realref (m), arg_real, GMP_RNDN);
- mpfr_from_real (mpc_imagref (m), arg_imag, GMP_RNDN);
- mpfr_clear_flags ();
- bool inexact = func (m, m, crnd);
- bool ok = do_mpc_ckconv (result_real, result_imag, m, inexact, format);
- mpc_clear (m);
-
- return ok;
-}
-
-/* Try to evaluate:
-
- RESULT = f (ARG0, ARG1)
-
- in format FORMAT, given that FUNC is the mpc implementation of f.
- Return true on success. RESULT, ARG0 and ARG1 are represented as
- real and imaginary pairs. */
-
-static bool
-do_mpc_arg2 (real_value *result_real, real_value *result_imag,
- int (*func)(mpc_ptr, mpc_srcptr, mpc_srcptr, mpc_rnd_t),
- const real_value *arg0_real, const real_value *arg0_imag,
- const real_value *arg1_real, const real_value *arg1_imag,
- const real_format *format)
-{
- if (!real_isfinite (arg0_real)
- || !real_isfinite (arg0_imag)
- || !real_isfinite (arg1_real)
- || !real_isfinite (arg1_imag))
- return false;
-
- int prec = format->p;
- mpc_rnd_t crnd = format->round_towards_zero ? MPC_RNDZZ : MPC_RNDNN;
- mpc_t m0, m1;
-
- mpc_init2 (m0, prec);
- mpc_init2 (m1, prec);
- mpfr_from_real (mpc_realref (m0), arg0_real, GMP_RNDN);
- mpfr_from_real (mpc_imagref (m0), arg0_imag, GMP_RNDN);
- mpfr_from_real (mpc_realref (m1), arg1_real, GMP_RNDN);
- mpfr_from_real (mpc_imagref (m1), arg1_imag, GMP_RNDN);
- mpfr_clear_flags ();
- bool inexact = func (m0, m0, m1, crnd);
- bool ok = do_mpc_ckconv (result_real, result_imag, m0, inexact, format);
- mpc_clear (m0);
- mpc_clear (m1);
-
- return ok;
-}
-
-/* Try to evaluate:
-
- *RESULT = logb (*ARG)
-
- in format FORMAT. Return true on success. */
-
-static bool
-fold_const_logb (real_value *result, const real_value *arg,
- const real_format *format)
-{
- switch (arg->cl)
- {
- case rvc_nan:
- /* If arg is +-NaN, then return it. */
- *result = *arg;
- return true;
-
- case rvc_inf:
- /* If arg is +-Inf, then return +Inf. */
- *result = *arg;
- result->sign = 0;
- return true;
-
- case rvc_zero:
- /* Zero may set errno and/or raise an exception. */
- return false;
-
- case rvc_normal:
- /* For normal numbers, proceed iff radix == 2. In GCC,
- normalized significands are in the range [0.5, 1.0). We
- want the exponent as if they were [1.0, 2.0) so get the
- exponent and subtract 1. */
- if (format->b == 2)
- {
- real_from_integer (result, format, REAL_EXP (arg) - 1, SIGNED);
- return true;
- }
- return false;
- }
- gcc_unreachable ();
-}
-
-/* Try to evaluate:
-
- *RESULT = significand (*ARG)
-
- in format FORMAT. Return true on success. */
-
-static bool
-fold_const_significand (real_value *result, const real_value *arg,
- const real_format *format)
-{
- switch (arg->cl)
- {
- case rvc_zero:
- case rvc_nan:
- case rvc_inf:
- /* If arg is +-0, +-Inf or +-NaN, then return it. */
- *result = *arg;
- return true;
-
- case rvc_normal:
- /* For normal numbers, proceed iff radix == 2. */
- if (format->b == 2)
- {
- *result = *arg;
- /* In GCC, normalized significands are in the range [0.5, 1.0).
- We want them to be [1.0, 2.0) so set the exponent to 1. */
- SET_REAL_EXP (result, 1);
- return true;
- }
- return false;
- }
- gcc_unreachable ();
-}
-
-/* Try to evaluate:
-
- *RESULT = f (*ARG)
-
- where FORMAT is the format of *ARG and PRECISION is the number of
- significant bits in the result. Return true on success. */
-
-static bool
-fold_const_conversion (wide_int *result,
- void (*fn) (real_value *, format_helper,
- const real_value *),
- const real_value *arg, unsigned int precision,
- const real_format *format)
-{
- if (!real_isfinite (arg))
- return false;
-
- real_value rounded;
- fn (&rounded, format, arg);
-
- bool fail = false;
- *result = real_to_integer (&rounded, &fail, precision);
- return !fail;
-}
-
-/* Try to evaluate:
-
- *RESULT = pow (*ARG0, *ARG1)
-
- in format FORMAT. Return true on success. */
-
-static bool
-fold_const_pow (real_value *result, const real_value *arg0,
- const real_value *arg1, const real_format *format)
-{
- if (do_mpfr_arg2 (result, mpfr_pow, arg0, arg1, format))
- return true;
-
- /* Check for an integer exponent. */
- REAL_VALUE_TYPE cint1;
- HOST_WIDE_INT n1 = real_to_integer (arg1);
- real_from_integer (&cint1, VOIDmode, n1, SIGNED);
- /* Attempt to evaluate pow at compile-time, unless this should
- raise an exception. */
- if (real_identical (arg1, &cint1)
- && (n1 > 0
- || (!flag_trapping_math && !flag_errno_math)
- || !real_equal (arg0, &dconst0)))
- {
- bool inexact = real_powi (result, format, arg0, n1);
- if (flag_unsafe_math_optimizations || !inexact)
- return true;
- }
-
- return false;
-}
-
-/* Try to evaluate:
-
- *RESULT = ldexp (*ARG0, ARG1)
-
- in format FORMAT. Return true on success. */
-
-static bool
-fold_const_builtin_load_exponent (real_value *result, const real_value *arg0,
- const wide_int_ref &arg1,
- const real_format *format)
-{
- /* Bound the maximum adjustment to twice the range of the
- mode's valid exponents. Use abs to ensure the range is
- positive as a sanity check. */
- int max_exp_adj = 2 * labs (format->emax - format->emin);
-
- /* The requested adjustment must be inside this range. This
- is a preliminary cap to avoid things like overflow, we
- may still fail to compute the result for other reasons. */
- if (wi::les_p (arg1, -max_exp_adj) || wi::ges_p (arg1, max_exp_adj))
- return false;
-
- REAL_VALUE_TYPE initial_result;
- real_ldexp (&initial_result, arg0, arg1.to_shwi ());
-
- /* Ensure we didn't overflow. */
- if (real_isinf (&initial_result))
- return false;
-
- /* Only proceed if the target mode can hold the
- resulting value. */
- *result = real_value_truncate (format, initial_result);
- return real_equal (&initial_result, result);
-}
-
-/* Fold a call to __builtin_nan or __builtin_nans with argument ARG and
- return type TYPE. QUIET is true if a quiet rather than signalling
- NaN is required. */
-
-static tree
-fold_const_builtin_nan (tree type, tree arg, bool quiet)
-{
- REAL_VALUE_TYPE real;
- const char *str = c_getstr (arg);
- if (str && real_nan (&real, str, quiet, TYPE_MODE (type)))
- return build_real (type, real);
- return NULL_TREE;
-}
-
-/* Try to evaluate:
-
- *RESULT = FN (*ARG)
-
- in format FORMAT. Return true on success. */
-
-static bool
-fold_const_call_ss (real_value *result, built_in_function fn,
- const real_value *arg, const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_SQRT):
- return (real_compare (GE_EXPR, arg, &dconst0)
- && do_mpfr_arg1 (result, mpfr_sqrt, arg, format));
-
- CASE_FLT_FN (BUILT_IN_CBRT):
- return do_mpfr_arg1 (result, mpfr_cbrt, arg, format);
-
- CASE_FLT_FN (BUILT_IN_ASIN):
- return (real_compare (GE_EXPR, arg, &dconstm1)
- && real_compare (LE_EXPR, arg, &dconst1)
- && do_mpfr_arg1 (result, mpfr_asin, arg, format));
-
- CASE_FLT_FN (BUILT_IN_ACOS):
- return (real_compare (GE_EXPR, arg, &dconstm1)
- && real_compare (LE_EXPR, arg, &dconst1)
- && do_mpfr_arg1 (result, mpfr_acos, arg, format));
-
- CASE_FLT_FN (BUILT_IN_ATAN):
- return do_mpfr_arg1 (result, mpfr_atan, arg, format);
-
- CASE_FLT_FN (BUILT_IN_ASINH):
- return do_mpfr_arg1 (result, mpfr_asinh, arg, format);
-
- CASE_FLT_FN (BUILT_IN_ACOSH):
- return (real_compare (GE_EXPR, arg, &dconst1)
- && do_mpfr_arg1 (result, mpfr_acosh, arg, format));
-
- CASE_FLT_FN (BUILT_IN_ATANH):
- return (real_compare (GE_EXPR, arg, &dconstm1)
- && real_compare (LE_EXPR, arg, &dconst1)
- && do_mpfr_arg1 (result, mpfr_atanh, arg, format));
-
- CASE_FLT_FN (BUILT_IN_SIN):
- return do_mpfr_arg1 (result, mpfr_sin, arg, format);
-
- CASE_FLT_FN (BUILT_IN_COS):
- return do_mpfr_arg1 (result, mpfr_cos, arg, format);
-
- CASE_FLT_FN (BUILT_IN_TAN):
- return do_mpfr_arg1 (result, mpfr_tan, arg, format);
-
- CASE_FLT_FN (BUILT_IN_SINH):
- return do_mpfr_arg1 (result, mpfr_sinh, arg, format);
-
- CASE_FLT_FN (BUILT_IN_COSH):
- return do_mpfr_arg1 (result, mpfr_cosh, arg, format);
-
- CASE_FLT_FN (BUILT_IN_TANH):
- return do_mpfr_arg1 (result, mpfr_tanh, arg, format);
-
- CASE_FLT_FN (BUILT_IN_ERF):
- return do_mpfr_arg1 (result, mpfr_erf, arg, format);
-
- CASE_FLT_FN (BUILT_IN_ERFC):
- return do_mpfr_arg1 (result, mpfr_erfc, arg, format);
-
- CASE_FLT_FN (BUILT_IN_TGAMMA):
- return do_mpfr_arg1 (result, mpfr_gamma, arg, format);
-
- CASE_FLT_FN (BUILT_IN_EXP):
- return do_mpfr_arg1 (result, mpfr_exp, arg, format);
-
- CASE_FLT_FN (BUILT_IN_EXP2):
- return do_mpfr_arg1 (result, mpfr_exp2, arg, format);
-
- CASE_FLT_FN (BUILT_IN_EXP10):
- CASE_FLT_FN (BUILT_IN_POW10):
- return do_mpfr_arg1 (result, mpfr_exp10, arg, format);
-
- CASE_FLT_FN (BUILT_IN_EXPM1):
- return do_mpfr_arg1 (result, mpfr_expm1, arg, format);
-
- CASE_FLT_FN (BUILT_IN_LOG):
- return (real_compare (GT_EXPR, arg, &dconst0)
- && do_mpfr_arg1 (result, mpfr_log, arg, format));
-
- CASE_FLT_FN (BUILT_IN_LOG2):
- return (real_compare (GT_EXPR, arg, &dconst0)
- && do_mpfr_arg1 (result, mpfr_log2, arg, format));
-
- CASE_FLT_FN (BUILT_IN_LOG10):
- return (real_compare (GT_EXPR, arg, &dconst0)
- && do_mpfr_arg1 (result, mpfr_log10, arg, format));
-
- CASE_FLT_FN (BUILT_IN_LOG1P):
- return (real_compare (GT_EXPR, arg, &dconstm1)
- && do_mpfr_arg1 (result, mpfr_log1p, arg, format));
-
- CASE_FLT_FN (BUILT_IN_J0):
- return do_mpfr_arg1 (result, mpfr_j0, arg, format);
-
- CASE_FLT_FN (BUILT_IN_J1):
- return do_mpfr_arg1 (result, mpfr_j1, arg, format);
-
- CASE_FLT_FN (BUILT_IN_Y0):
- return (real_compare (GT_EXPR, arg, &dconst0)
- && do_mpfr_arg1 (result, mpfr_y0, arg, format));
-
- CASE_FLT_FN (BUILT_IN_Y1):
- return (real_compare (GT_EXPR, arg, &dconst0)
- && do_mpfr_arg1 (result, mpfr_y1, arg, format));
-
- CASE_FLT_FN (BUILT_IN_FLOOR):
- if (!REAL_VALUE_ISNAN (*arg) || !flag_errno_math)
- {
- real_floor (result, format, arg);
- return true;
- }
- return false;
-
- CASE_FLT_FN (BUILT_IN_CEIL):
- if (!REAL_VALUE_ISNAN (*arg) || !flag_errno_math)
- {
- real_ceil (result, format, arg);
- return true;
- }
- return false;
-
- CASE_FLT_FN (BUILT_IN_TRUNC):
- real_trunc (result, format, arg);
- return true;
-
- CASE_FLT_FN (BUILT_IN_ROUND):
- if (!REAL_VALUE_ISNAN (*arg) || !flag_errno_math)
- {
- real_round (result, format, arg);
- return true;
- }
- return false;
-
- CASE_FLT_FN (BUILT_IN_LOGB):
- return fold_const_logb (result, arg, format);
-
- CASE_FLT_FN (BUILT_IN_SIGNIFICAND):
- return fold_const_significand (result, arg, format);
-
- default:
- return false;
- }
-}
-
-/* Try to evaluate:
-
- *RESULT = FN (*ARG)
-
- where FORMAT is the format of ARG and PRECISION is the number of
- significant bits in the result. Return true on success. */
-
-static bool
-fold_const_call_ss (wide_int *result, built_in_function fn,
- const real_value *arg, unsigned int precision,
- const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_SIGNBIT):
- if (real_isneg (arg))
- *result = wi::one (precision);
- else
- *result = wi::zero (precision);
- return true;
-
- CASE_FLT_FN (BUILT_IN_ILOGB):
- /* For ilogb we don't know FP_ILOGB0, so only handle normal values.
- Proceed iff radix == 2. In GCC, normalized significands are in
- the range [0.5, 1.0). We want the exponent as if they were
- [1.0, 2.0) so get the exponent and subtract 1. */
- if (arg->cl == rvc_normal && format->b == 2)
- {
- *result = wi::shwi (REAL_EXP (arg) - 1, precision);
- return true;
- }
- return false;
-
- CASE_FLT_FN (BUILT_IN_ICEIL):
- CASE_FLT_FN (BUILT_IN_LCEIL):
- CASE_FLT_FN (BUILT_IN_LLCEIL):
- return fold_const_conversion (result, real_ceil, arg,
- precision, format);
-
- CASE_FLT_FN (BUILT_IN_LFLOOR):
- CASE_FLT_FN (BUILT_IN_IFLOOR):
- CASE_FLT_FN (BUILT_IN_LLFLOOR):
- return fold_const_conversion (result, real_floor, arg,
- precision, format);
-
- CASE_FLT_FN (BUILT_IN_IROUND):
- CASE_FLT_FN (BUILT_IN_LROUND):
- CASE_FLT_FN (BUILT_IN_LLROUND):
- return fold_const_conversion (result, real_round, arg,
- precision, format);
-
- CASE_FLT_FN (BUILT_IN_IRINT):
- CASE_FLT_FN (BUILT_IN_LRINT):
- CASE_FLT_FN (BUILT_IN_LLRINT):
- /* Not yet folded to a constant. */
- return false;
-
- CASE_FLT_FN (BUILT_IN_FINITE):
- case BUILT_IN_FINITED32:
- case BUILT_IN_FINITED64:
- case BUILT_IN_FINITED128:
- case BUILT_IN_ISFINITE:
- *result = wi::shwi (real_isfinite (arg) ? 1 : 0, precision);
- return true;
-
- CASE_FLT_FN (BUILT_IN_ISINF):
- case BUILT_IN_ISINFD32:
- case BUILT_IN_ISINFD64:
- case BUILT_IN_ISINFD128:
- if (real_isinf (arg))
- *result = wi::shwi (arg->sign ? -1 : 1, precision);
- else
- *result = wi::shwi (0, precision);
- return true;
-
- CASE_FLT_FN (BUILT_IN_ISNAN):
- case BUILT_IN_ISNAND32:
- case BUILT_IN_ISNAND64:
- case BUILT_IN_ISNAND128:
- *result = wi::shwi (real_isnan (arg) ? 1 : 0, precision);
- return true;
-
- default:
- return false;
- }
-}
-
-/* Try to evaluate:
-
- *RESULT = FN (ARG)
-
- where ARG_TYPE is the type of ARG and PRECISION is the number of bits
- in the result. Return true on success. */
-
-static bool
-fold_const_call_ss (wide_int *result, built_in_function fn,
- const wide_int_ref &arg, unsigned int precision,
- tree arg_type)
-{
- switch (fn)
- {
- CASE_INT_FN (BUILT_IN_FFS):
- *result = wi::shwi (wi::ffs (arg), precision);
- return true;
-
- CASE_INT_FN (BUILT_IN_CLZ):
- {
- int tmp;
- if (wi::ne_p (arg, 0))
- tmp = wi::clz (arg);
- else if (! CLZ_DEFINED_VALUE_AT_ZERO (TYPE_MODE (arg_type), tmp))
- tmp = TYPE_PRECISION (arg_type);
- *result = wi::shwi (tmp, precision);
- return true;
- }
-
- CASE_INT_FN (BUILT_IN_CTZ):
- {
- int tmp;
- if (wi::ne_p (arg, 0))
- tmp = wi::ctz (arg);
- else if (! CTZ_DEFINED_VALUE_AT_ZERO (TYPE_MODE (arg_type), tmp))
- tmp = TYPE_PRECISION (arg_type);
- *result = wi::shwi (tmp, precision);
- return true;
- }
-
- CASE_INT_FN (BUILT_IN_CLRSB):
- *result = wi::shwi (wi::clrsb (arg), precision);
- return true;
-
- CASE_INT_FN (BUILT_IN_POPCOUNT):
- *result = wi::shwi (wi::popcount (arg), precision);
- return true;
-
- CASE_INT_FN (BUILT_IN_PARITY):
- *result = wi::shwi (wi::parity (arg), precision);
- return true;
-
- case BUILT_IN_BSWAP16:
- case BUILT_IN_BSWAP32:
- case BUILT_IN_BSWAP64:
- *result = wide_int::from (arg, precision, TYPE_SIGN (arg_type)).bswap ();
- return true;
-
- default:
- return false;
- }
-}
-
-/* Try to evaluate:
-
- RESULT = FN (*ARG)
-
- where FORMAT is the format of ARG and of the real and imaginary parts
- of RESULT, passed as RESULT_REAL and RESULT_IMAG respectively. Return
- true on success. */
-
-static bool
-fold_const_call_cs (real_value *result_real, real_value *result_imag,
- built_in_function fn, const real_value *arg,
- const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_CEXPI):
- /* cexpi(x+yi) = cos(x)+sin(y)*i. */
- return do_mpfr_sincos (result_imag, result_real, arg, format);
-
- default:
- return false;
- }
-}
-
-/* Try to evaluate:
-
- *RESULT = fn (ARG)
-
- where FORMAT is the format of RESULT and of the real and imaginary parts
- of ARG, passed as ARG_REAL and ARG_IMAG respectively. Return true on
- success. */
-
-static bool
-fold_const_call_sc (real_value *result, built_in_function fn,
- const real_value *arg_real, const real_value *arg_imag,
- const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_CABS):
- return do_mpfr_arg2 (result, mpfr_hypot, arg_real, arg_imag, format);
-
- default:
- return false;
- }
-}
-
-/* Try to evaluate:
-
- RESULT = fn (ARG)
-
- where FORMAT is the format of the real and imaginary parts of RESULT
- (RESULT_REAL and RESULT_IMAG) and of ARG (ARG_REAL and ARG_IMAG).
- Return true on success. */
-
-static bool
-fold_const_call_cc (real_value *result_real, real_value *result_imag,
- built_in_function fn, const real_value *arg_real,
- const real_value *arg_imag, const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_CCOS):
- return do_mpc_arg1 (result_real, result_imag, mpc_cos,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CCOSH):
- return do_mpc_arg1 (result_real, result_imag, mpc_cosh,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CPROJ):
- if (real_isinf (arg_real) || real_isinf (arg_imag))
- {
- real_inf (result_real);
- *result_imag = dconst0;
- result_imag->sign = arg_imag->sign;
- }
- else
- {
- *result_real = *arg_real;
- *result_imag = *arg_imag;
- }
- return true;
-
- CASE_FLT_FN (BUILT_IN_CSIN):
- return do_mpc_arg1 (result_real, result_imag, mpc_sin,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CSINH):
- return do_mpc_arg1 (result_real, result_imag, mpc_sinh,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CTAN):
- return do_mpc_arg1 (result_real, result_imag, mpc_tan,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CTANH):
- return do_mpc_arg1 (result_real, result_imag, mpc_tanh,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CLOG):
- return do_mpc_arg1 (result_real, result_imag, mpc_log,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CSQRT):
- return do_mpc_arg1 (result_real, result_imag, mpc_sqrt,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CASIN):
- return do_mpc_arg1 (result_real, result_imag, mpc_asin,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CACOS):
- return do_mpc_arg1 (result_real, result_imag, mpc_acos,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CATAN):
- return do_mpc_arg1 (result_real, result_imag, mpc_atan,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CASINH):
- return do_mpc_arg1 (result_real, result_imag, mpc_asinh,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CACOSH):
- return do_mpc_arg1 (result_real, result_imag, mpc_acosh,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CATANH):
- return do_mpc_arg1 (result_real, result_imag, mpc_atanh,
- arg_real, arg_imag, format);
-
- CASE_FLT_FN (BUILT_IN_CEXP):
- return do_mpc_arg1 (result_real, result_imag, mpc_exp,
- arg_real, arg_imag, format);
-
- default:
- return false;
- }
-}
-
-/* Subroutine of fold_const_call, with the same interface. Handle cases
- where the arguments and result are numerical. */
-
-static tree
-fold_const_call_1 (built_in_function fn, tree type, tree arg)
-{
- machine_mode mode = TYPE_MODE (type);
- machine_mode arg_mode = TYPE_MODE (TREE_TYPE (arg));
-
- if (integer_cst_p (arg))
- {
- if (SCALAR_INT_MODE_P (mode))
- {
- wide_int result;
- if (fold_const_call_ss (&result, fn, arg, TYPE_PRECISION (type),
- TREE_TYPE (arg)))
- return wide_int_to_tree (type, result);
- }
- return NULL_TREE;
- }
-
- if (real_cst_p (arg))
- {
- gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg_mode));
- if (mode == arg_mode)
- {
- /* real -> real. */
- REAL_VALUE_TYPE result;
- if (fold_const_call_ss (&result, fn, TREE_REAL_CST_PTR (arg),
- REAL_MODE_FORMAT (mode)))
- return build_real (type, result);
- }
- else if (COMPLEX_MODE_P (mode)
- && GET_MODE_INNER (mode) == arg_mode)
- {
- /* real -> complex real. */
- REAL_VALUE_TYPE result_real, result_imag;
- if (fold_const_call_cs (&result_real, &result_imag, fn,
- TREE_REAL_CST_PTR (arg),
- REAL_MODE_FORMAT (arg_mode)))
- return build_complex (type,
- build_real (TREE_TYPE (type), result_real),
- build_real (TREE_TYPE (type), result_imag));
- }
- else if (INTEGRAL_TYPE_P (type))
- {
- /* real -> int. */
- wide_int result;
- if (fold_const_call_ss (&result, fn,
- TREE_REAL_CST_PTR (arg),
- TYPE_PRECISION (type),
- REAL_MODE_FORMAT (arg_mode)))
- return wide_int_to_tree (type, result);
- }
- return NULL_TREE;
- }
-
- if (complex_cst_p (arg))
- {
- gcc_checking_assert (COMPLEX_MODE_P (arg_mode));
- machine_mode inner_mode = GET_MODE_INNER (arg_mode);
- tree argr = TREE_REALPART (arg);
- tree argi = TREE_IMAGPART (arg);
- if (mode == arg_mode
- && real_cst_p (argr)
- && real_cst_p (argi))
- {
- /* complex real -> complex real. */
- REAL_VALUE_TYPE result_real, result_imag;
- if (fold_const_call_cc (&result_real, &result_imag, fn,
- TREE_REAL_CST_PTR (argr),
- TREE_REAL_CST_PTR (argi),
- REAL_MODE_FORMAT (inner_mode)))
- return build_complex (type,
- build_real (TREE_TYPE (type), result_real),
- build_real (TREE_TYPE (type), result_imag));
- }
- if (mode == inner_mode
- && real_cst_p (argr)
- && real_cst_p (argi))
- {
- /* complex real -> real. */
- REAL_VALUE_TYPE result;
- if (fold_const_call_sc (&result, fn,
- TREE_REAL_CST_PTR (argr),
- TREE_REAL_CST_PTR (argi),
- REAL_MODE_FORMAT (inner_mode)))
- return build_real (type, result);
- }
- return NULL_TREE;
- }
-
- return NULL_TREE;
-}
-
-/* Try to fold FN (ARG) to a constant. Return the constant on success,
- otherwise return null. TYPE is the type of the return value. */
-
-tree
-fold_const_call (built_in_function fn, tree type, tree arg)
-{
- switch (fn)
- {
- case BUILT_IN_STRLEN:
- if (const char *str = c_getstr (arg))
- return build_int_cst (type, strlen (str));
- return NULL_TREE;
-
- CASE_FLT_FN (BUILT_IN_NAN):
- case BUILT_IN_NAND32:
- case BUILT_IN_NAND64:
- case BUILT_IN_NAND128:
- return fold_const_builtin_nan (type, arg, true);
-
- CASE_FLT_FN (BUILT_IN_NANS):
- return fold_const_builtin_nan (type, arg, false);
-
- default:
- return fold_const_call_1 (fn, type, arg);
- }
-}
-
-/* Try to evaluate:
-
- *RESULT = FN (*ARG0, *ARG1)
-
- in format FORMAT. Return true on success. */
-
-static bool
-fold_const_call_sss (real_value *result, built_in_function fn,
- const real_value *arg0, const real_value *arg1,
- const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_DREM):
- CASE_FLT_FN (BUILT_IN_REMAINDER):
- return do_mpfr_arg2 (result, mpfr_remainder, arg0, arg1, format);
-
- CASE_FLT_FN (BUILT_IN_ATAN2):
- return do_mpfr_arg2 (result, mpfr_atan2, arg0, arg1, format);
-
- CASE_FLT_FN (BUILT_IN_FDIM):
- return do_mpfr_arg2 (result, mpfr_dim, arg0, arg1, format);
-
- CASE_FLT_FN (BUILT_IN_HYPOT):
- return do_mpfr_arg2 (result, mpfr_hypot, arg0, arg1, format);
-
- CASE_FLT_FN (BUILT_IN_COPYSIGN):
- *result = *arg0;
- real_copysign (result, arg1);
- return true;
-
- CASE_FLT_FN (BUILT_IN_FMIN):
- return do_mpfr_arg2 (result, mpfr_min, arg0, arg1, format);
-
- CASE_FLT_FN (BUILT_IN_FMAX):
- return do_mpfr_arg2 (result, mpfr_max, arg0, arg1, format);
-
- CASE_FLT_FN (BUILT_IN_POW):
- return fold_const_pow (result, arg0, arg1, format);
-
- default:
- return false;
- }
-}
-
-/* Try to evaluate:
-
- *RESULT = FN (*ARG0, ARG1)
-
- where FORMAT is the format of *RESULT and *ARG0. Return true on
- success. */
-
-static bool
-fold_const_call_sss (real_value *result, built_in_function fn,
- const real_value *arg0, const wide_int_ref &arg1,
- const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_LDEXP):
- return fold_const_builtin_load_exponent (result, arg0, arg1, format);
-
- CASE_FLT_FN (BUILT_IN_SCALBN):
- CASE_FLT_FN (BUILT_IN_SCALBLN):
- return (format->b == 2
- && fold_const_builtin_load_exponent (result, arg0, arg1,
- format));
-
- CASE_FLT_FN (BUILT_IN_POWI):
- real_powi (result, format, arg0, arg1.to_shwi ());
- return true;
-
- default:
- return false;
- }
-}
-
-/* Try to evaluate:
-
- *RESULT = FN (ARG0, *ARG1)
-
- where FORMAT is the format of *RESULT and *ARG1. Return true on
- success. */
-
-static bool
-fold_const_call_sss (real_value *result, built_in_function fn,
- const wide_int_ref &arg0, const real_value *arg1,
- const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_JN):
- return do_mpfr_arg2 (result, mpfr_jn, arg0, arg1, format);
-
- CASE_FLT_FN (BUILT_IN_YN):
- return (real_compare (GT_EXPR, arg1, &dconst0)
- && do_mpfr_arg2 (result, mpfr_yn, arg0, arg1, format));
-
- default:
- return false;
- }
-}
-
-/* Try to evaluate:
-
- RESULT = fn (ARG0, ARG1)
-
- where FORMAT is the format of the real and imaginary parts of RESULT
- (RESULT_REAL and RESULT_IMAG), of ARG0 (ARG0_REAL and ARG0_IMAG)
- and of ARG1 (ARG1_REAL and ARG1_IMAG). Return true on success. */
-
-static bool
-fold_const_call_ccc (real_value *result_real, real_value *result_imag,
- built_in_function fn, const real_value *arg0_real,
- const real_value *arg0_imag, const real_value *arg1_real,
- const real_value *arg1_imag, const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_CPOW):
- return do_mpc_arg2 (result_real, result_imag, mpc_pow,
- arg0_real, arg0_imag, arg1_real, arg1_imag, format);
-
- default:
- return false;
- }
-}
-
-/* Subroutine of fold_const_call, with the same interface. Handle cases
- where the arguments and result are numerical. */
-
-static tree
-fold_const_call_1 (built_in_function fn, tree type, tree arg0, tree arg1)
-{
- machine_mode mode = TYPE_MODE (type);
- machine_mode arg0_mode = TYPE_MODE (TREE_TYPE (arg0));
- machine_mode arg1_mode = TYPE_MODE (TREE_TYPE (arg1));
-
- if (arg0_mode == arg1_mode
- && real_cst_p (arg0)
- && real_cst_p (arg1))
- {
- gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg0_mode));
- if (mode == arg0_mode)
- {
- /* real, real -> real. */
- REAL_VALUE_TYPE result;
- if (fold_const_call_sss (&result, fn, TREE_REAL_CST_PTR (arg0),
- TREE_REAL_CST_PTR (arg1),
- REAL_MODE_FORMAT (mode)))
- return build_real (type, result);
- }
- return NULL_TREE;
- }
-
- if (real_cst_p (arg0)
- && integer_cst_p (arg1))
- {
- gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg0_mode));
- if (mode == arg0_mode)
- {
- /* real, int -> real. */
- REAL_VALUE_TYPE result;
- if (fold_const_call_sss (&result, fn, TREE_REAL_CST_PTR (arg0),
- arg1, REAL_MODE_FORMAT (mode)))
- return build_real (type, result);
- }
- return NULL_TREE;
- }
-
- if (integer_cst_p (arg0)
- && real_cst_p (arg1))
- {
- gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg1_mode));
- if (mode == arg1_mode)
- {
- /* int, real -> real. */
- REAL_VALUE_TYPE result;
- if (fold_const_call_sss (&result, fn, arg0,
- TREE_REAL_CST_PTR (arg1),
- REAL_MODE_FORMAT (mode)))
- return build_real (type, result);
- }
- return NULL_TREE;
- }
-
- if (arg0_mode == arg1_mode
- && complex_cst_p (arg0)
- && complex_cst_p (arg1))
- {
- gcc_checking_assert (COMPLEX_MODE_P (arg0_mode));
- machine_mode inner_mode = GET_MODE_INNER (arg0_mode);
- tree arg0r = TREE_REALPART (arg0);
- tree arg0i = TREE_IMAGPART (arg0);
- tree arg1r = TREE_REALPART (arg1);
- tree arg1i = TREE_IMAGPART (arg1);
- if (mode == arg0_mode
- && real_cst_p (arg0r)
- && real_cst_p (arg0i)
- && real_cst_p (arg1r)
- && real_cst_p (arg1i))
- {
- /* complex real, complex real -> complex real. */
- REAL_VALUE_TYPE result_real, result_imag;
- if (fold_const_call_ccc (&result_real, &result_imag, fn,
- TREE_REAL_CST_PTR (arg0r),
- TREE_REAL_CST_PTR (arg0i),
- TREE_REAL_CST_PTR (arg1r),
- TREE_REAL_CST_PTR (arg1i),
- REAL_MODE_FORMAT (inner_mode)))
- return build_complex (type,
- build_real (TREE_TYPE (type), result_real),
- build_real (TREE_TYPE (type), result_imag));
- }
- return NULL_TREE;
- }
-
- return NULL_TREE;
-}
-
-/* Try to fold FN (ARG0, ARG1) to a constant. Return the constant on success,
- otherwise return null. TYPE is the type of the return value. */
-
-tree
-fold_const_call (built_in_function fn, tree type, tree arg0, tree arg1)
-{
- const char *p0, *p1;
- switch (fn)
- {
- case BUILT_IN_STRSPN:
- if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1)))
- return build_int_cst (type, strspn (p0, p1));
- return NULL_TREE;
-
- case BUILT_IN_STRCSPN:
- if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1)))
- return build_int_cst (type, strcspn (p0, p1));
- return NULL_TREE;
-
- case BUILT_IN_STRCMP:
- if ((p0 = c_getstr (arg0)) && (p1 = c_getstr (arg1)))
- return build_cmp_result (type, strcmp (p0, p1));
- return NULL_TREE;
-
- default:
- return fold_const_call_1 (fn, type, arg0, arg1);
- }
-}
-
-/* Try to evaluate:
-
- *RESULT = FN (*ARG0, *ARG1, *ARG2)
-
- in format FORMAT. Return true on success. */
-
-static bool
-fold_const_call_ssss (real_value *result, built_in_function fn,
- const real_value *arg0, const real_value *arg1,
- const real_value *arg2, const real_format *format)
-{
- switch (fn)
- {
- CASE_FLT_FN (BUILT_IN_FMA):
- return do_mpfr_arg3 (result, mpfr_fma, arg0, arg1, arg2, format);
-
- default:
- return false;
- }
-}
-
-/* Subroutine of fold_const_call, with the same interface. Handle cases
- where the arguments and result are numerical. */
-
-static tree
-fold_const_call_1 (built_in_function fn, tree type, tree arg0, tree arg1,
- tree arg2)
-{
- machine_mode mode = TYPE_MODE (type);
- machine_mode arg0_mode = TYPE_MODE (TREE_TYPE (arg0));
- machine_mode arg1_mode = TYPE_MODE (TREE_TYPE (arg1));
- machine_mode arg2_mode = TYPE_MODE (TREE_TYPE (arg2));
-
- if (arg0_mode == arg1_mode
- && arg0_mode == arg2_mode
- && real_cst_p (arg0)
- && real_cst_p (arg1)
- && real_cst_p (arg2))
- {
- gcc_checking_assert (SCALAR_FLOAT_MODE_P (arg0_mode));
- if (mode == arg0_mode)
- {
- /* real, real, real -> real. */
- REAL_VALUE_TYPE result;
- if (fold_const_call_ssss (&result, fn, TREE_REAL_CST_PTR (arg0),
- TREE_REAL_CST_PTR (arg1),
- TREE_REAL_CST_PTR (arg2),
- REAL_MODE_FORMAT (mode)))
- return build_real (type, result);
- }
- return NULL_TREE;
- }
-
- return NULL_TREE;
-}
-
-/* Try to fold FN (ARG0, ARG1, ARG2) to a constant. Return the constant on
- success, otherwise return null. TYPE is the type of the return value. */
-
-tree
-fold_const_call (built_in_function fn, tree type, tree arg0, tree arg1,
- tree arg2)
-{
- const char *p0, *p1;
- size_t s2;
- switch (fn)
- {
- case BUILT_IN_STRNCMP:
- if ((p0 = c_getstr (arg0))
- && (p1 = c_getstr (arg1))
- && host_size_t_cst_p (arg2, &s2))
- return build_int_cst (type, strncmp (p0, p1, s2));
- return NULL_TREE;
-
- case BUILT_IN_BCMP:
- case BUILT_IN_MEMCMP:
- if ((p0 = c_getstr (arg0))
- && (p1 = c_getstr (arg1))
- && host_size_t_cst_p (arg2, &s2)
- && s2 <= strlen (p0)
- && s2 <= strlen (p1))
- return build_cmp_result (type, memcmp (p0, p1, s2));
- return NULL_TREE;
-
- default:
- return fold_const_call_1 (fn, type, arg0, arg1, arg2);
- }
-}
-
-/* Fold a fma operation with arguments ARG[012]. */
-
-tree
-fold_fma (location_t, tree type, tree arg0, tree arg1, tree arg2)
-{
- REAL_VALUE_TYPE result;
- if (real_cst_p (arg0)
- && real_cst_p (arg1)
- && real_cst_p (arg2)
- && do_mpfr_arg3 (&result, mpfr_fma, TREE_REAL_CST_PTR (arg0),
- TREE_REAL_CST_PTR (arg1), TREE_REAL_CST_PTR (arg2),
- REAL_MODE_FORMAT (TYPE_MODE (type))))
- return build_real (type, result);
-
- return NULL_TREE;
-}
projects / thirdparty / gcc.git / blobdiff