backport: re PR target/87532 (bad results from vec_extract(unsigned char, foo) dependent upon function inline)
gcc/ChangeLog:
2019-04-22 Kelvin Nilsen <kelvin@gcc.gnu.org>
Backport from mainline
2019-03-15 Kelvin Nilsen <kelvin@gcc.gnu.org>
PR target/87532
* config/rs6000/rs6000-c.c (altivec_resolve_overloaded_builtin):
When handling vec_extract, use modular arithmetic to allow
constant selectors greater than vector length.
* config/rs6000/rs6000.c (rs6000_expand_vector_extract): Allow
V1TImode vectors to have constant selector values greater than 0.
Use modular arithmetic to compute vector index.
(rs6000_split_vec_extract_var): Use modular arithmetic to compute
index for in-memory vectors. Correct code generation for
in-register vectors. Use inner mode of vector rather than mode of
destination for move instruction.
(altivec_expand_vec_ext_builtin): Use modular arithmetic to
compute index.
2019-04-12 Kelvin Nilsen <kelvin@gcc.gnu.org>
PR target/87532
* config/rs6000/vsx.md (*vsx_extract_<mode>_<VS_scalar>mode_var):
Use QI inner mode with V16QI vector mode.
gcc/testsuite/ChangeLog:
2019-04-22 Kelvin Nilsen <kelvin@gcc.gnu.org>
Backport from mainline
2019-03-15 Kelvin Nilsen <kelvin@gcc.gnu.org>
PR target/87532
* gcc.target/powerpc/pr87532-mc.c: New test.
* gcc.target/powerpc/pr87532.c: New test.
* gcc.target/powerpc/vec-extract-v16qiu-v2.h: New test.
* gcc.target/powerpc/vec-extract-v16qiu-v2a.c: New test.
* gcc.target/powerpc/vec-extract-v16qiu-v2b.c: New test.
* gcc.target/powerpc/vsx-builtin-10a.c: New test.
* gcc.target/powerpc/vsx-builtin-10b.c: New test.
* gcc.target/powerpc/vsx-builtin-11a.c: New test.
* gcc.target/powerpc/vsx-builtin-11b.c: New test.
* gcc.target/powerpc/vsx-builtin-12a.c: New test.
* gcc.target/powerpc/vsx-builtin-12b.c: New test.
* gcc.target/powerpc/vsx-builtin-13a.c: New test.
* gcc.target/powerpc/vsx-builtin-13b.c: New test.
* gcc.target/powerpc/vsx-builtin-14a.c: New test.
* gcc.target/powerpc/vsx-builtin-14b.c: New test.
* gcc.target/powerpc/vsx-builtin-15a.c: New test.
* gcc.target/powerpc/vsx-builtin-15b.c: New test.
* gcc.target/powerpc/vsx-builtin-16a.c: New test.
* gcc.target/powerpc/vsx-builtin-16b.c: New test.
* gcc.target/powerpc/vsx-builtin-17a.c: New test.
* gcc.target/powerpc/vsx-builtin-17b.c: New test.
* gcc.target/powerpc/vsx-builtin-18a.c: New test.
* gcc.target/powerpc/vsx-builtin-18b.c: New test.
* gcc.target/powerpc/vsx-builtin-19a.c: New test.
* gcc.target/powerpc/vsx-builtin-19b.c: New test.
* gcc.target/powerpc/vsx-builtin-20a.c: New test.
* gcc.target/powerpc/vsx-builtin-20b.c: New test.
* gcc.target/powerpc/vsx-builtin-9a.c: New test.
* gcc.target/powerpc/vsx-builtin-9b.c: New test.
2019-03-19 Kelvin Nilsen <kelvin@gcc.gnu.org>
PR target/89736
* gcc.target/powerpc/pr87532-mc.c: Modify dejagnu directives to
restrict this test to vsx targets.
Xiong Hu Luo [Fri, 19 Apr 2019 03:30:33 +0000 (03:30 +0000)]
backport r257541, r259936, r260294, r260623, r261098, r261333, r268585 from trunk
These patches are followed changes for r255555 on testcases
vsx-vector-6*.c. Backport them to update file names and fix regressions
for GCC7 on power9.
See e.g. https://gcc.gnu.org/ml/gcc-testresults/2019-04/msg00159.html
for the failures this patch fixes; the patch is for GCC 7.
gcc/ChangeLog:
2019-04-19 Xiong Hu Luo <luoxhu@linux.ibm.com>
Backport from trunk
2018-05-23 Segher Boessenkool <segher@kernel.crashing.org>
* doc/sourcebuild.texi (Endianness): New subsubsection.
gcc/testsuite/ChangeLog:
2019-04-19 Xiong Hu Luo <luoxhu@linux.ibm.com>
Backport from trunk
2018-02-07 Will Schmidt <will_schmidt@vnet.ibm.com>
* gcc.target/powerpc/vsx-vector-6-le.c: Update CPU target.
* gcc.target/powerpc/vsx-vector-6-le.p9.c: New.
Backport from trunk
2018-05-04 Carl Love <cel@us.ibm.com>
* gcc.target/powerpc/vsx-vector-6.h (foo): Add test for vec_max,
vec_trunc.
* gcc.target/powerpc/vsx-vector-6-le.c (dg-final): Update xvcmpeqdp,
xvcmpgtdp, xvcmpgedp counts. Add xxsel counts.
* gcc.target/powerpc/vsx-vector-6-be.c (dg-final): Update xvcmpgtdp,
xvcmpgedp counts. Add xxsel counts.
Backport from trunk
2018-05-16 Carl Love <cel@us.ibm.com>
* gcc.target/powerpc/vsx-vector-6-be.c: Remove file.
* gcc.target/powerpc/vsx-vector-6-be.p7.c: New test file.
* gcc.target/powerpc/vsx-vector-6-be.p8.c: New test file.
* gcc.target/powerpc/vsx-vector-6-le.c (dg-final): Update counts for
xvcmpeqdp., xvcmpgtdp., xvcmpgedp., xxlxor, xvrdpi.
Backport from trunk
2018-05-23 Segher Boessenkool <segher@kernel.crashing.org>
Backport from trunk
2018-06-01 Carl Love <cel@us.ibm.com>
Commit 260294 on 2018-05-16 by Carl Love was supposed to add the
following files.
* gcc.target/powerpc/vsx-vector-6-be.p7.c: New test file.
* gcc.target/powerpc/vsx-vector-6-be.p8.c: New test file.
Backport from trunk
2018-06-08 Carl Love <cel@us.ibm.com>
* gcc.target/powerpc/vsx-vector-6-be.p7.c: Rename this file to
vsx-vector-6.p7.c.
* gcc.target/powerpc/vsx-vector-6-le.p9.c: Rename this file to
vsx-vector-6.p9.c.
* gcc.target/powerpc/vsx-vector-6-be.p8.c: Move instruction counts
for BE system that are different then for an LE system from this file
into vsx-vector-6-le.c using be target qualifier. Remove this file.
* gcc.target/powerpc/vsx-vector-6-le.c: Add le qualifiers as needed for
the various instruction counts. Rename file to vsx-vector-6.p8.c.
Backport from trunk
2019-02-06 Bill Seurer <seurer@linux.vnet.ibm.com>
* gcc.target/powerpc/vsx-vector-6.p7.c: Update instruction
counts and target.
* gcc.target/powerpc/vsx-vector-6.p8.c: Update instruction
counts and target.
* gcc.target/powerpc/vsx-vector-6.p9.c: Update instruction
counts and target.
Thomas Koenig [Sun, 14 Apr 2019 12:27:44 +0000 (12:27 +0000)]
re PR fortran/87352 (Large stack usage with new gfortran)
2019-04-14 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/87352
Backport from trunk
* gfortran.h (gfc_component): Add finalized field.
* class.c (finalize_component): If the component is already
finalized, return early. Set component->finalized on exit.
2019-04-14 Thomas Koenig <tkoenig@gcc.gnu.org>
Backport from trunk
PR fortran/87352
* gfortran.dg/finalize_28.f90: Adjust count of __builtin_free.
* gfortran.dg/finalize_34.f90: New test.
Martin Liska [Thu, 11 Apr 2019 08:59:48 +0000 (10:59 +0200)]
Backport r269492
2019-04-11 Martin Liska <mliska@suse.cz>
Backport from mainline
2019-03-08 Martin Liska <mliska@suse.cz>
PR target/86952
* config/i386/i386.c (ix86_option_override_internal): Disable
jump tables when retpolines are used.
2019-04-11 Martin Liska <mliska@suse.cz>
Backport from mainline
2019-03-08 Martin Liska <mliska@suse.cz>
PR target/86952
* gcc.target/i386/pr86952.c: New test.
* gcc.target/i386/indirect-thunk-7.c: Use jump tables to match
scanned pattern.
* gcc.target/i386/indirect-thunk-inline-7.c: Likewise.
The "*neon_mov<mode>" patterns for 128 bit sized quantities uses the "Dn"
constraint to match vmov.f32 and vmov.i<vec-width> patterns.
This constraint boils down to using the `neon_immediate_valid` function.
Once the constraint has matched, the output C statement asserts that function
passes.
The output C statement calls `neon_immediate_valid` with the mode taken from the
iterator, while the constraint takes the mode from the operand.
This can cause a discrepency when the operand is a CONST_INT, as the constraint
passes VOIDmode which `neon_immediate_valid` treats as DImode, while the C
statement passes the mode of the iterator which can be TImode.
When this happens, the `neon_immediate_valid` can fail in the second call (if
e.g. the CONST_INT is a valid immediate in DImode but not TImode) which would
trigger the assertion.
The testcase added with this patch triggers this when compiled with an arm cross
compiler using the command line below.
gcc -march=armv8-a -c neon-immediate-timode.c -O1 -mfloat-abi=hard -mfpu=neon-fp-armv8
This patch splits the original "Dn" constraint into three new constraints, "DN"
for TImode CONST_INT, "Dn" for DImode CONST_INT, and "Dm" for CONST_VECTOR.
Splitting things up this way requires using one extra alternative in the
"*neon_mov<mode>" patterns, but makes it clear from the constraint what mode is
being used.
We also remove the behaviour of treating VOIDmode as DImode in
`neon_valid_immediate` since the original "Dn" constraint was the only place
that functionality was used. VOIDmode is now never passed to that function.
An assertion has been added to the function to ensure this problem is caught
earlier on.
bootstrapped and regtested on arm-none-linux-gnueabihf
gcc/ChangeLog:
2019-04-10 Matthew Malcomson <matthew.malcomson@arm.com>
PR target/90024
* config/arm/arm.c (neon_valid_immediate): Disallow VOIDmode parameter.
* config/arm/constraints.md (Dm, DN, Dn): Split previous Dn constraint
into three.
* config/arm/neon.md (*neon_mov<mode>): Account for TImode and DImode
differences directly.
(*smax<mode>3_neon, vashl<mode>3, vashr<mode>3_imm): Use Dm constraint.
gcc/testsuite/ChangeLog:
2019-04-10 Matthew Malcomson <matthew.malcomson@arm.com>
PR target/90024
* gcc.dg/torture/neon-immediate-timode.c: New test.
Richard Biener [Tue, 26 Mar 2019 13:18:23 +0000 (13:18 +0000)]
backport: [multiple changes]
2019-02-26 Richard Biener <rguenther@suse.de>
Backport from mainline
2019-02-12 Richard Biener <rguenther@suse.de>
PR tree-optimization/89253
* tree-ssa-loop-split.c (tree_ssa_split_loops): Check we can
duplicate the loop.
* gfortran.dg/pr89253.f: New testcase.
2019-02-08 Richard Biener <rguenther@suse.de>
PR middle-end/89223
* tree-data-ref.c (initialize_matrix_A): Fail if constant
doesn't fit in HWI.
(analyze_subscript_affine_affine): Handle failure from
initialize_matrix_A.
* gcc.dg/torture/pr89223.c: New testcase.
2019-01-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/88739
* tree-ssa-sccvn.c (vn_reference_lookup_3): Avoid generating
BIT_FIELD_REFs of non-mode-precision integral operands.
Richard Biener [Tue, 26 Mar 2019 11:18:26 +0000 (11:18 +0000)]
backport: [multiple changes]
2019-03-26 Richard Biener <rguenther@suse.de>
Backport from mainline
2019-01-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/86554
* tree-ssa-sccvn.c (visit_nary_op): When value-numbering to
expressions with different overflow behavior make sure there's an
available expression on the path.
* gcc.dg/torture/pr86554-1.c: New testcase.
* gcc.dg/torture/pr86554-2.c: Likewise.
2018-11-20 Richard Biener <rguenther@suse.de>
PR tree-optimization/88105
* tree-ssa-dom.c (pass_dominator::execute): Do not walk
backedges.
* gcc.dg/gomp/pr88105.c: New testcase.
2018-03-08 Richard Biener <rguenther@suse.de>
PR middle-end/84552
* tree-scalar-evolution.c: Include tree-into-ssa.h.
(follow_copies_to_constant): Do not follow SSA names registered
for update.
Thomas Schwinge [Thu, 21 Mar 2019 18:57:56 +0000 (19:57 +0100)]
[testsuite, Fortran] Consistently set 'DEFAULT_FFLAGS'
In the same 'runtest' instance, 'global' variables persist from one '*.exp'
file to another.
All other '*.exp' files are using " -pedantic-errors" instead of the empty
string as the default for 'DEFAULT_FFLAGS'. Thus this setting of
'DEFAULT_FFLAGS' is not idempotent, depends on whether
'gfortran.dg/ieee/ieee.exp', or an other defining '*.exp' file is executed
first.
gcc/testsuite/
PR fortran/29383
* gfortran.dg/ieee/ieee.exp (DEFAULT_FFLAGS): Set the same as in
other '*.exp' files.
Matthias Klose [Thu, 21 Mar 2019 12:28:26 +0000 (12:28 +0000)]
backport: re PR tree-optimization/89505 (LibreOffice miscompilation starting with r260383)
2019-03-21 Matthias Klose <doko@ubuntu.com>
Backport from mainline
2019-02-26 Richard Biener <rguenther@suse.de>
PR tree-optimization/89505
* tree-ssa-structalias.c (compute_dependence_clique): Make sure
to handle restrict pointed-to vars with multiple subvars
correctly.
2019-03-21 Matthias Klose <doko@ubuntu.com>
Backport from mainline
2019-02-26 Richard Biener <rguenther@suse.de>
PR tree-optimization/89505
* gcc.dg/torture/pr89505.c: New testcase.
Thomas Koenig [Sun, 17 Mar 2019 12:54:29 +0000 (12:54 +0000)]
re PR fortran/84394 (compiler error when using modules with derived types in block data subprograms)
2019-03-17 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/84394
Backport from trunk
* symbol.c (gfc_add_subroutine): If we are encountering a
subrtoutine within a BLOCK DATA and the name starts with an
underscore, do not check.
2019-03-17 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/84394
Backport from trunk
* gfortran.dg/blockdata_11.f90: New test.
H.J. Lu [Sun, 17 Mar 2019 09:27:56 +0000 (09:27 +0000)]
x32: Add addr32 prefix to VSIB address
32-bit indices in VSIB address are sign-extended to 64 bits. In x32,
when 32-bit indices are used as addresses, like in
vgatherdps %ymm7, 0(,%ymm9,1), %ymm6
32-bit indices, 0xf7fa3010, is sign-extended to 0xfffffffff7fa3010 which
is invalid address. Add addr32 prefix to UNSPEC_VSIBADDR instructions
for x32 if there is no base register nor symbol.
This fixes 175.vpr and 254.gap in SPEC CPU 2000 on x32 with
-Ofast -funroll-loops -march=haswell
gcc/
Backport from mainline
2019-03-14 H.J. Lu <hongjiu.lu@intel.com>
PR target/89523
* config/i386/i386.c (ix86_print_operand): Handle 'M' to add
addr32 prefix to VSIB address for X32.
* config/i386/sse.md (*avx512pf_gatherpf<mode>sf_mask): Prepend
"%M2" to opcode.
(*avx512pf_gatherpf<mode>df_mask): Likewise.
(*avx512pf_scatterpf<mode>sf_mask): Likewise.
(*avx512pf_scatterpf<mode>df_mask): Likewise.
(*avx2_gathersi<mode>): Prepend "%M3" to opcode.
(*avx2_gathersi<mode>_2): Prepend "%M2" to opcode.
(*avx2_gatherdi<mode>): Prepend "%M3" to opcode.
(*avx2_gatherdi<mode>_2): Prepend "%M2" to opcode.
(*avx2_gatherdi<mode>_3): Prepend "%M3" to opcode.
(*avx2_gatherdi<mode>_4): Prepend "%M2" to opcode.`
(*avx512f_gathersi<mode>): Prepend "%M4" to opcode.
(*avx512f_gathersi<mode>_2): Prepend "%M3" to opcode.
(*avx512f_gatherdi<mode>): Prepend "%M4" to opcode.
(*avx512f_gatherdi<mode>_2): Prepend "%M3" to opcode.
(*avx512f_scattersi<mode>): Prepend "%M0" to opcode.
(*avx512f_scatterdi<mode>): Likewise.
gcc/testsuite/
Backport from mainline
2019-03-14 H.J. Lu <hongjiu.lu@intel.com>
Thomas Koenig [Sat, 16 Mar 2019 14:03:00 +0000 (14:03 +0000)]
re PR fortran/66089 (elemental dependency mishandling when class array are involved)
2019-03-16 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/66089
Backport from trunk
* trans-array.c (gfc_scalar_elemental_arg_saved_as_reference):
Return false if a scalar tempoary is needed.
(gfc_walk_variable_expr): Fix up class refs.
2019-03-16 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/66089
Backport from trunk
* gfortran.dg/dependency_53.f90: New test.
* gfortran.dg/assumed_type_2.f90: Adapted tree dumps.
* gfortran.dg/no_arg_check_2.f90: Likewise.
Thomas Koenig [Sat, 16 Mar 2019 13:24:40 +0000 (13:24 +0000)]
re PR fortran/66695 ([F03] ICE with binding-name equal to the name of a use-associated procedure)
2019-03-16 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/66695
PR fortran/77746
PR fortran/79485
Backport from trunk
* gfortran.h (gfc_symbol): Add bind_c component.
(gfc_get_gsymbol): Add argument bind_c.
* decl.c (add_global_entry): Add bind_c argument to
gfc_get_symbol.
* parse.c (parse_block_data): Likewise.
(parse_module): Likewise.
(add_global_procedure): Likewise.
(add_global_program): Likewise.
* resolve.c (resolve_common_blocks): Likewise.
(resolve_global_procedure): Likewise.
(gfc_verify_binding_labels): Likewise.
* symbol.c (gfc_get_gsymbol): Add argument bind_c. Set bind_c
in gsym.
* trans-decl.c (gfc_get_module_backend_decl): Add bind_c argument
to gfc_get_symbol.
(gfc_get_extern_function_decl): If the sym has a binding label
and it cannot be found in the global symbol tabel, it is the wrong
one and vice versa.
2019-03-16 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/66695
PR fortran/77746
PR fortran/79485
Backport from trunk
* gfortran.dg/binding_label_tests_30.f90: New test.
* gfortran.dg/binding_label_tests_31.f90: New test.
* gfortran.dg/binding_label_tests_32.f90: New test.
* gfortran.dg/binding_label_tests_33.f90: New test.
Richard Biener [Thu, 14 Mar 2019 09:18:07 +0000 (09:18 +0000)]
backport: re PR target/84272 (AddressSanitizer: heap-use-after-free ../../gcc/config/aarch64/cortex-a57-fma-steering.c:519 in fma_node::get_parity())
2019-03-14 Richard Biener <rguenther@suse.de>
Backport from mainline
2018-02-16 Jakub Jelinek <jakub@redhat.com>
PR target/84272
* config/aarch64/cortex-a57-fma-steering.c (fma_forest::merge_forest):
Use ++iter rather than iter++ for std::list iterators.
(func_fma_steering::dfs): Likewise. Don't delete nodes right away,
defer deleting them until all nodes in the forest are processed. Do
free even leaf nodes. Change to_process into auto_vec.
Martin Liska [Mon, 11 Mar 2019 11:18:08 +0000 (12:18 +0100)]
Backport r268789
2019-03-11 Martin Liska <mliska@suse.cz>
Backport from mainline
2019-02-11 David Malcolm <dmalcolm@redhat.com>
PR lto/88147
* input.c (selftest::test_line_offset_overflow): New selftest.
(selftest::input_c_tests): Call it.
2019-03-11 Martin Liska <mliska@suse.cz>
Backport from mainline
2019-02-11 Martin Liska <mliska@suse.cz>
PR lto/88147
* line-map.c (linemap_line_start): Don't reuse the existing line
map if the line offset is sufficiently large to cause overflow
when computing location_t values.
Thomas Koenig [Sun, 10 Mar 2019 11:26:25 +0000 (11:26 +0000)]
re PR fortran/71544 (gfortran compiler optimization bug when dealing with c-style pointers)
2019-03-10 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/71544
Backport from trunk
* trans-types.c (gfc_typenode_for_spec) Set ts->is_c_interop of
C_PTR and C_FUNPTR.
(create_fn_spec): Mark argument as escaping if ts->is_c_interop is set.
2019-03-10 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/71544
Backport from trunk
* gfortran.dg/c_ptr_tests_19.f90: New test.
Thomas Koenig [Sun, 10 Mar 2019 11:09:30 +0000 (11:09 +0000)]
re PR fortran/87734 (ICE in is_illegal_recursion check for character len= parameter)
2019-03-10 Thomas Koenig <tkoenig@gcc.gnu.org>
Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/87734
Backort from trunk
* symbol.c (gfc_add_procedure): Only throw an error if the
procedure has not been declared either PUBLIC or PRIVATE.
* resolve.c (is_illegal_recursion): Remove an assert().
2019-03-10 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/87734
Backport from trunk
* gfortran.dg/public_private_module_10.f90: New test.
Co-Authored-By: Steven G. Kargl <kargl@gcc.gnu.org>
From-SVN: r269550
Thomas Koenig [Sun, 3 Mar 2019 09:20:09 +0000 (09:20 +0000)]
re PR fortran/87689 (PowerPC64 ELFv2 function parameter passing violation)
2019-03-03 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/87689
Backport from trunk
* trans-decl.c (gfc_get_extern_function_decl): Add argument
actual_args and pass it through to gfc_get_function_type.
* trans-expr.c (conv_function_val): Add argument actual_args
and pass it on to gfc_get_extern_function_decl.
(conv_procedure_call): Pass actual arguments to conv_function_val.
* trans-types.c (get_formal_from_actual_arglist): New function.
(gfc_get_function_type): Add argument actual_args. Generate
formal args from actual args if necessary.
* trans-types.h (gfc_get_function_type): Add optional argument.
* trans.h (gfc_get_extern_function_decl): Add optional argument.
2019-03-03 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/87689
Backport from trunk
* gfortran.dg/lto/20091028-1_0.f90: Add -Wno-lto-type-mismatch to
options.
* gfortran.dg/lto/20091028-2_0.f90: Likewise.
* gfortran.dg/lto/pr87689_0.f: New file.
* gfortran.dg/lto/pr87689_1.f: New file.
* gfortran.dg/altreturn_9_0.f90: New file.
* gfortran.dg/altreturn_9_1.f90: New file.
Eric Botcazou [Tue, 26 Feb 2019 08:12:21 +0000 (08:12 +0000)]
re PR ada/81956 (call to null procedure not optimized away)
PR ada/81956
Backport from mainline
2017-09-06 Ed Schonberg <schonberg@adacore.com>
* exp_ch6.adb (Expand_Call_Helper): Do not optimize calls to
null procedures when GNAT coverage is used, so that their (empty)
bodies are properly covered.
2017-09-06 Ed Schonberg <schonberg@adacore.com>
* exp_ch6.adb (Expand_Call_Helper): Replace call to null
procedure by a single null statement, after evaluating the
actuals that require it.
projects / thirdparty / gcc.git / log
