https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61306
Oleg Endo <olegendo at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |olegendo at gcc dot gnu.org
--- Comment #10 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to thopre01 from comment #6)
> Author: thopre01
> Date: Wed Jun 11 10:04:33 2014
> New Revision: 211444
>
> URL: http://gcc.gnu.org/viewcvs?rev=211444&root=gcc&view=rev
> Log:
> 2014-06-11 Thomas Preud'homme <thomas.preudho...@arm.com>
>
> gcc/
> PR tree-optimization/61306
> * tree-ssa-math-opts.c (struct symbolic_number): Store type of
> expression instead of its size.
> (do_shift_rotate): Adapt to change in struct symbolic_number. Return
> false to prevent optimization when the result is unpredictable due to
> arithmetic right shift of signed type with highest byte is set.
> (verify_symbolic_number_p): Adapt to change in struct symbolic_number.
> (init_symbolic_number): Likewise.
> (find_bswap_or_nop_1): Likewise. Return NULL to prevent optimization
> when the result is unpredictable due to sign extension.
>
> gcc/testsuite/
> * gcc.c-torture/execute/pr61306-1.c: New test.
> * gcc.c-torture/execute/pr61306-2.c: Likewise.
> * gcc.c-torture/execute/pr61306-3.c: Likewise.
>
> Added:
> trunk/gcc/testsuite/gcc.c-torture/execute/pr61306-1.c
> trunk/gcc/testsuite/gcc.c-torture/execute/pr61306-2.c
> trunk/gcc/testsuite/gcc.c-torture/execute/pr61306-3.c
> Modified:
> trunk/gcc/ChangeLog
> trunk/gcc/testsuite/ChangeLog
> trunk/gcc/tree-ssa-math-opts.c
It seems that after this commit, one SH bswap32 test started to fail.
Comparing the two test reports:
https://gcc.gnu.org/ml/gcc-testresults/2014-06/msg00961.html
https://gcc.gnu.org/ml/gcc-testresults/2014-06/msg01086.html
shows a new failure for gcc.target/sh/pr53568-1.c.
The function
int
test_func_02 (int a)
{
/* 1x swap.w
2x swap.b */
return (((a >> 0) & 0xFF) << 24)
| (((a >> 8) & 0xFF) << 16)
| (((a >> 16) & 0xFF) << 8)
| (((a >> 24) & 0xFF) << 0);
}
now fails to produce a bswap32.
