/* This file contains the definitions and documentation for the
machine modes used in the GNU compiler.
- Copyright (C) 1987, 1992, 1994, 1997, 1998, 2000, 2003
- Free Software Foundation, Inc.
+ Copyright (C) 1987-2019 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 2, or (at your option) any later
+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
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* This file defines all the MACHINE MODES used by GCC.
A CLASS argument must be one of the constants defined in
mode-classes.def, less the leading MODE_ prefix; some statements
- that take CLASS arguments have restructions on which classes are
+ that take CLASS arguments have restrictions on which classes are
acceptable. For instance, INT.
A MODE argument must be the printable name of a machine mode,
without quotation marks or trailing "mode". For instance, SI.
- A BITSIZE, BYTESIZE, or COUNT argument must be a positive integer
+ A PRECISION, BYTESIZE, or COUNT argument must be a positive integer
constant.
A FORMAT argument must be one of the real_mode_format structures
declares MODE to be of class INT and BYTESIZE bytes wide.
All of the bits of its representation are significant.
- FRACTIONAL_INT_MODE (MODE, BITSIZE, BYTESIZE);
+ FRACTIONAL_INT_MODE (MODE, PRECISION, BYTESIZE);
declares MODE to be of class INT, BYTESIZE bytes wide in
- storage, but with only BITSIZE significant bits.
+ storage, but with only PRECISION significant bits.
FLOAT_MODE (MODE, BYTESIZE, FORMAT);
declares MODE to be of class FLOAT and BYTESIZE bytes wide,
using floating point format FORMAT.
All of the bits of its representation are significant.
- FRACTIONAL_FLOAT_MODE (MODE, BITSIZE, BYTESIZE, FORMAT);
+ FRACTIONAL_FLOAT_MODE (MODE, PRECISION, BYTESIZE, FORMAT);
declares MODE to be of class FLOAT, BYTESIZE bytes wide in
- storage, but with only BITSIZE significant bits, using
+ storage, but with only PRECISION significant bits, using
floating point format FORMAT.
+ DECIMAL_FLOAT_MODE (MODE, BYTESIZE, FORMAT);
+ declares MODE to be of class DECIMAL_FLOAT and BYTESIZE bytes
+ wide. All of the bits of its representation are significant.
+
+ FRACTIONAL_DECIMAL_FLOAT_MODE (MODE, BYTESIZE, FORMAT);
+ declares MODE to be of class DECIMAL_FLOAT and BYTESIZE bytes
+ wide. All of the bits of its representation are significant.
+
+ FRACT_MODE (MODE, BYTESIZE, FBIT);
+ declares MODE to be of class FRACT and BYTESIZE bytes wide
+ with FBIT fractional bits. There may be padding bits.
+
+ UFRACT_MODE (MODE, BYTESIZE, FBIT);
+ declares MODE to be of class UFRACT and BYTESIZE bytes wide
+ with FBIT fractional bits. There may be padding bits.
+
+ ACCUM_MODE (MODE, BYTESIZE, IBIT, FBIT);
+ declares MODE to be of class ACCUM and BYTESIZE bytes wide
+ with IBIT integral bits and FBIT fractional bits.
+ There may be padding bits.
+
+ UACCUM_MODE (MODE, BYTESIZE, IBIT, FBIT);
+ declares MODE to be of class UACCUM and BYTESIZE bytes wide
+ with IBIT integral bits and FBIT fractional bits.
+ There may be padding bits.
+
RESET_FLOAT_FORMAT (MODE, FORMAT);
changes the format of MODE, which must be class FLOAT,
to FORMAT. Use in an ARCH-modes.def to reset the format
of one of the float modes defined in this file.
- PARTIAL_INT_MODE (MODE);
+ PARTIAL_INT_MODE (MODE, PRECISION, NAME);
declares a mode of class PARTIAL_INT with the same size as
- MODE (which must be an INT mode). The name of the new mode
- is made by prefixing a P to the name MODE. This statement
- may grow a BITSIZE argument in the future.
+ MODE (which must be an INT mode) and precision PREC.
+ Optionally, NAME is the new name of the mode. NAME is the
+ name of the mode.
VECTOR_MODE (CLASS, MODE, COUNT);
Declare a vector mode whose component mode is MODE (of class
than two bytes (if CLASS is FLOAT). CLASS must be INT or
FLOAT. The names follow the same rule as VECTOR_MODE uses.
+ VECTOR_MODES_WITH_PREFIX (PREFIX, CLASS, WIDTH);
+ Like VECTOR_MODES, but start the mode names with PREFIX instead
+ of the usual "V".
+
+ VECTOR_BOOL_MODE (NAME, COUNT, BYTESIZE)
+ Create a vector mode called NAME that contains COUNT boolean
+ elements and occupies BYTESIZE bytes in total. Each boolean
+ element occupies (COUNT * BITS_PER_UNIT) / BYTESIZE bits, with
+ the element at index 0 occupying the lsb of the first byte in
+ memory. Only the lowest bit of each element is significant.
+
COMPLEX_MODES (CLASS);
For all modes presently declared in class CLASS, construct
corresponding complex modes. Modes smaller than one byte
ADJUST_BYTESIZE (MODE, EXPR);
ADJUST_ALIGNMENT (MODE, EXPR);
ADJUST_FLOAT_FORMAT (MODE, EXPR);
- Arrange for the byte size, alignment, or floating point format
- of MODE to be adjustable at run time. EXPR will be executed
+ ADJUST_IBIT (MODE, EXPR);
+ ADJUST_FBIT (MODE, EXPR);
+ Arrange for the byte size, alignment, floating point format, ibit,
+ or fbit of MODE to be adjustable at run time. EXPR will be executed
once after processing all command line options, and should
- evaluate to the desired byte size, alignment, or format.
+ evaluate to the desired byte size, alignment, format, ibit or fbit.
Unlike a FORMAT argument, if you are adjusting a float format
you must put an & in front of the name of each format structure.
+ ADJUST_NUNITS (MODE, EXPR);
+ Like the above, but set the number of nunits of MODE to EXPR.
+ This changes the size and precision of the mode in proportion
+ to the change in the number of units; for example, doubling
+ the number of units doubles the size and precision as well.
+
Note: If a mode is ever made which is more than 255 bytes wide,
machmode.h and genmodes.c will have to be changed to allocate
more space for the mode_size and mode_alignment arrays. */
FRACTIONAL_INT_MODE (BI, 1, 1);
/* Basic integer modes. We go up to TI in generic code (128 bits).
- The name OI is reserved for a 256-bit type (needed by some back ends).
- FIXME TI shouldn't be generically available either. */
+ TImode is needed here because the some front ends now genericly
+ support __int128. If the front ends decide to generically support
+ larger types, then corresponding modes must be added here. The
+ name OI is reserved for a 256-bit type (needed by some back ends).
+ */
INT_MODE (QI, 1);
INT_MODE (HI, 2);
INT_MODE (SI, 4);
/* No partial integer modes are defined by default. */
+/* The target normally defines any target-specific __intN types and
+ their modes, but __int128 for TImode is fairly common so define it
+ here. The type will not be created unless the target supports
+ TImode. */
+
+INT_N (TI, 128);
+
/* Basic floating point modes. SF and DF are the only modes provided
by default. The names QF, HF, XF, and TF are reserved for targets
that need 1-word, 2-word, 80-bit, or 128-bit float types respectively.
These are the IEEE mappings. They can be overridden with
- RESET_FLOAT_FORMAT or at runtime (in OVERRIDE_OPTIONS). */
+ RESET_FLOAT_FORMAT or at runtime (in TARGET_OPTION_OVERRIDE). */
FLOAT_MODE (SF, 4, ieee_single_format);
FLOAT_MODE (DF, 8, ieee_double_format);
FIXME define this only for targets that need it. */
CC_MODE (CC);
+/* Fixed-point modes. */
+FRACT_MODE (QQ, 1, 7); /* s.7 */
+FRACT_MODE (HQ, 2, 15); /* s.15 */
+FRACT_MODE (SQ, 4, 31); /* s.31 */
+FRACT_MODE (DQ, 8, 63); /* s.63 */
+FRACT_MODE (TQ, 16, 127); /* s.127 */
+
+UFRACT_MODE (UQQ, 1, 8); /* .8 */
+UFRACT_MODE (UHQ, 2, 16); /* .16 */
+UFRACT_MODE (USQ, 4, 32); /* .32 */
+UFRACT_MODE (UDQ, 8, 64); /* .64 */
+UFRACT_MODE (UTQ, 16, 128); /* .128 */
+
+ACCUM_MODE (HA, 2, 8, 7); /* s8.7 */
+ACCUM_MODE (SA, 4, 16, 15); /* s16.15 */
+ACCUM_MODE (DA, 8, 32, 31); /* s32.31 */
+ACCUM_MODE (TA, 16, 64, 63); /* s64.63 */
+
+UACCUM_MODE (UHA, 2, 8, 8); /* 8.8 */
+UACCUM_MODE (USA, 4, 16, 16); /* 16.16 */
+UACCUM_MODE (UDA, 8, 32, 32); /* 32.32 */
+UACCUM_MODE (UTA, 16, 64, 64); /* 64.64 */
+
/* Allow the target to specify additional modes of various kinds. */
#if HAVE_EXTRA_MODES
# include EXTRA_MODES_FILE
/* Complex modes. */
COMPLEX_MODES (INT);
+COMPLEX_MODES (PARTIAL_INT);
COMPLEX_MODES (FLOAT);
-/* Vector modes. */
-VECTOR_MODES (INT, 2); /* V2QI */
-VECTOR_MODES (INT, 4); /* V4QI V2HI */
-VECTOR_MODES (INT, 8); /* V8QI V4HI V2SI */
-VECTOR_MODES (INT, 16); /* V16QI V8HI V4SI V2DI */
-/* VECTOR_MODES (INT, 32); V8SI V4DI */
-/* VECTOR_MODES (INT, 64); V8DI */
-
-VECTOR_MODE (INT, SI, 8)
-VECTOR_MODE (INT, DI, 4);
-VECTOR_MODE (INT, DI, 8);
-
-/* PPC uses this to distinguish between DImode passed in
- float registers and DImode passed in vector registers.
- It would be in rs6000-modes.def but it's referenced in
- c-common.c. FIXME. */
-
-VECTOR_MODE (INT, DI, 1);
-
-VECTOR_MODES (FLOAT, 4); /* V2HF */
-VECTOR_MODES (FLOAT, 8); /* V4HF V2SF */
-VECTOR_MODES (FLOAT, 16); /* V8HF V4SF V2DF */
-/* VECTOR_MODES (FLOAT, 32); V8SF V4DF */
-/* VECTOR_MODES (FLOAT, 64); V16SF V8DF */
-
-VECTOR_MODE (FLOAT, SF, 8);
-VECTOR_MODE (FLOAT, SF, 16);
-VECTOR_MODE (FLOAT, DF, 4);
-VECTOR_MODE (FLOAT, DF, 8);
+/* Decimal floating point modes. */
+DECIMAL_FLOAT_MODE (SD, 4, decimal_single_format);
+DECIMAL_FLOAT_MODE (DD, 8, decimal_double_format);
+DECIMAL_FLOAT_MODE (TD, 16, decimal_quad_format);
/* The symbol Pmode stands for one of the above machine modes (usually SImode).
The tm.h file specifies which one. It is not a distinct mode. */
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