diff options
| author | Alan Lawrence <alan.lawrence@arm.com> | 2016-03-10 12:19:45 +0000 |
|---|---|---|
| committer | Alan Lawrence <alalaw01@gcc.gnu.org> | 2016-03-10 12:19:45 +0000 |
| commit | 71017a7b7837a4eeb1d1c0b2b155c6567f4f3d95 (patch) | |
| tree | 53a07b60bfba985927686a3c1f4608c6205aaca9 /gcc/doc | |
| parent | 4b2066179084192b65d8e56e51c29bccaef4cfe9 (diff) | |
| download | gcc-71017a7b7837a4eeb1d1c0b2b155c6567f4f3d95.zip gcc-71017a7b7837a4eeb1d1c0b2b155c6567f4f3d95.tar.gz gcc-71017a7b7837a4eeb1d1c0b2b155c6567f4f3d95.tar.bz2 | |
Add -funconstrained-commons to work around PR/69368 (and others) in SPEC2006
gcc/:
* common.opt (funconstrained-commons, flag_unconstrained_commons): New.
* tree.c (array_at_struct_end_p): Do not limit to size of decl for
DECL_COMMONS if flag_unconstrained_commons is set.
* tree-dfa.c (get_ref_base_and_extent): Likewise.
* doc/invoke.texi (Optimize Options): Add -funconstrained-commons.
(funconstrained-commons): Document.
gcc/testsuite:
* gfortran.dg/unconstrained_commons.f: New.
Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
From-SVN: r234106
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 9580c10..99ac11b 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -408,7 +408,7 @@ Objective-C and Objective-C++ Dialects}. -ftree-parallelize-loops=@var{n} -ftree-pre -ftree-partial-pre -ftree-pta @gol -ftree-reassoc -ftree-sink -ftree-slsr -ftree-sra @gol -ftree-switch-conversion -ftree-tail-merge -ftree-ter @gol --ftree-vectorize -ftree-vrp @gol +-ftree-vectorize -ftree-vrp -funconstrained-commons @gol -funit-at-a-time -funroll-all-loops -funroll-loops @gol -funsafe-loop-optimizations -funsafe-math-optimizations -funswitch-loops @gol -fipa-ra -fvariable-expansion-in-unroller -fvect-cost-model -fvpt @gol @@ -6699,6 +6699,12 @@ the loop optimizer itself cannot prove that these assumptions are valid. If you use @option{-Wunsafe-loop-optimizations}, the compiler warns you if it finds this kind of loop. +@item -funconstrained-commons +@opindex funconstrained-commons +This option tells the compiler that variables declared in common blocks +(e.g. Fortran) may later be overridden with longer trailing arrays. This +prevents certain optimizations that depend on knowing the array bounds. + @item -fcrossjumping @opindex fcrossjumping Perform cross-jumping transformation. |