diff options
author | Ben Cheng <bccheng@google.com> | 2013-03-28 11:14:20 -0700 |
---|---|---|
committer | Ben Cheng <bccheng@google.com> | 2013-03-28 12:40:33 -0700 |
commit | af0c51ac87ab2a87caa03fa108f0d164987a2764 (patch) | |
tree | 4b8b470f7c5b69642fdab8d0aa1fbc148d02196b /gcc-4.8/gcc/testsuite/gcc.dg/nrv4.c | |
parent | d87cae247d39ebf4f5a6bf25c932a14d2fdb9384 (diff) | |
download | toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.tar.gz toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.tar.bz2 toolchain_gcc-af0c51ac87ab2a87caa03fa108f0d164987a2764.zip |
[GCC 4.8] Initial check-in of GCC 4.8.0
Change-Id: I0719d8a6d0f69b367a6ab6f10eb75622dbf12771
Diffstat (limited to 'gcc-4.8/gcc/testsuite/gcc.dg/nrv4.c')
-rw-r--r-- | gcc-4.8/gcc/testsuite/gcc.dg/nrv4.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/gcc-4.8/gcc/testsuite/gcc.dg/nrv4.c b/gcc-4.8/gcc/testsuite/gcc.dg/nrv4.c new file mode 100644 index 000000000..e213d860e --- /dev/null +++ b/gcc-4.8/gcc/testsuite/gcc.dg/nrv4.c @@ -0,0 +1,33 @@ +/* Verify that NRV optimizations are prohibited when the LHS is an + indirect reference to something that may be call-clobbered. */ +/* { dg-do compile } */ +/* { dg-options "-O -fdump-tree-optimized" } */ + +typedef struct { int x[20]; void *y; } S; +S nrv_candidate (void); +void use_result (S); +void make_escape (S *); +S global_S; +void foo (void) +{ + S *result; + S local_S; + + /* We can't perform return slot optimization because global_S is + global and may be clobbered by nrv_candidate. */ + result = &global_S; + *result = nrv_candidate (); + use_result (*result); + + /* We can't perform return slot optimization because local_S is + call_clobbered (its address escapes prior to invoking + nrv_candidate). */ + make_escape (&local_S); + result = &local_S; + *result = nrv_candidate (); + use_result (*result); +} + +/* { dg-final { scan-tree-dump-times "return slot optimization" 0 "optimized" } } */ +/* { dg-final { cleanup-tree-dump "optimized" } } */ + |