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| author | Alexandre Oliva <oliva@adacore.com> | 2020-06-10 17:56:36 -0300 |
|---|---|---|
| committer | Alexandre Oliva <oliva@gnu.org> | 2020-06-10 17:56:36 -0300 |
| commit | 06ef9c119c56568e5f77a5189aa382cb97c95a9e (patch) | |
| tree | 84ad8879bdf6ecf21a79e64f09569a2e6fc0a04f /gcc | |
| parent | a9eec9625ea7165292958be04899b057804192fb (diff) | |
| download | gcc-06ef9c119c56568e5f77a5189aa382cb97c95a9e.zip gcc-06ef9c119c56568e5f77a5189aa382cb97c95a9e.tar.gz gcc-06ef9c119c56568e5f77a5189aa382cb97c95a9e.tar.bz2 | |
[PR51447] restore the global reg var before returning from main
A runtime system might legitimately hold in rbx a value expected to be
preserved across the call to main, but its use as a global register
variable stops main from preserving it.
for gcc/testsuite/ChangeLog
PR rtl-optimization/51447
* gcc.c-torture/execute/pr51447.c (main): Preserve call-saved
register.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/testsuite/gcc.c-torture/execute/pr51447.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.c-torture/execute/pr51447.c b/gcc/testsuite/gcc.c-torture/execute/pr51447.c index 887ddb7..1d00953 100644 --- a/gcc/testsuite/gcc.c-torture/execute/pr51447.c +++ b/gcc/testsuite/gcc.c-torture/execute/pr51447.c @@ -14,6 +14,9 @@ int main (void) { __label__ nonlocal_lab; +#ifdef __x86_64__ + void *save = ptr; +#endif __attribute__((noinline, noclone)) void bar (void *func) { @@ -25,5 +28,8 @@ main (void) nonlocal_lab: if (ptr != &&nonlocal_lab) abort (); +#ifdef __x86_64__ + ptr = save; /* Restore the call-saved register. */ +#endif return 0; } |