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| author | Bin Cheng <bin.cheng@arm.com> | 2011-12-23 05:43:09 +0000 |
|---|---|---|
| committer | Joey Ye <jye2@gcc.gnu.org> | 2011-12-23 05:43:09 +0000 |
| commit | 2b9ed3bc10e02c3430fa6393b604095cb4bd943a (patch) | |
| tree | dcbbdbfe25be1bb7cb6bb32976e61c401d6ec529 /gcc/testsuite/gcc.dg | |
| parent | 994182df2760962dc90ab4f2eace2de84c669133 (diff) | |
| download | gcc-2b9ed3bc10e02c3430fa6393b604095cb4bd943a.zip gcc-2b9ed3bc10e02c3430fa6393b604095cb4bd943a.tar.gz gcc-2b9ed3bc10e02c3430fa6393b604095cb4bd943a.tar.bz2 | |
re PR tree-optimization/43491 (Unnecessary temporary for global register variable)
2011-12-22 Bin Cheng <bin.cheng@arm.com>
Richard Guenther <rguenther@suse.de>
PR tree-optimization/43491
* tree-ssa-pre.c (eliminate): Don't replace global register
variable when it is the RHS of a single assign.
testsuite:
* gcc.dg/tree-ssa/pr43491.c: New test.
Co-Authored-By: Richard Guenther <rguenther@suse.de>
From-SVN: r182650
Diffstat (limited to 'gcc/testsuite/gcc.dg')
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/pr43491.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr43491.c b/gcc/testsuite/gcc.dg/tree-ssa/pr43491.c new file mode 100644 index 0000000..2473400 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/pr43491.c @@ -0,0 +1,42 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-pre-stats" } */ + +#define REGISTER register + +#if defined __arm__ +# define REG1 asm("r4") +#elif defined __i386__ +# define REG1 asm("ebx") +#elif defined __mips__ +# define REG1 asm("s0") +#elif defined __x86_64__ +# define REG1 asm("rbp") +#else +# undef REGISTER +# define REGISTER +# define REG1 +#endif + +REGISTER long data_0 REG1; +long data_3; + +long foo(long data, long v) +{ + long i; + long t, u; + + if (data) + i = data_0 + data_3; + else { + v = 2; + i = 5; + } + t = data_0 + data_3; + u = i; + return v * t * u; +} +/* We should not eliminate global register variable when it is the RHS of + a single assignment. */ +/* { dg-final { scan-tree-dump-times "Eliminated: 2" 1 "pre" { target { arm-*-* i?86-*-* mips*-*-* x86_64-*-* } } } } */ +/* { dg-final { scan-tree-dump-times "Eliminated: 3" 1 "pre" { target { ! { arm-*-* i?86-*-* mips*-*-* x86_64-*-* } } } } } */ +/* { dg-final { cleanup-tree-dump "pre" } } */ |