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| author | H.J. Lu <hjl.tools@gmail.com> | 2016-01-21 11:51:47 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-01-22 10:49:32 -0800 |
| commit | 8dcdab63ef8df5c9f2739383686bc7eedcb303e5 (patch) | |
| tree | 93cd493e747cc68df8837868faa04024a040335b /gcc/testsuite/gcc.dg/torture/pr69399.c | |
| parent | 64c6e7a35bf51c2794a8cfd9f6c0f5b92929c0f7 (diff) | |
| download | gcc-hjl/pr69399/gcc-5-branch.tar.gz | |
Add HAVE_WORKING_CXX_BUILTIN_CONSTANT_Phjl/pr69399/gcc-5-branch
Without the fix for PR 65656, g++ miscompiles __builtin_constant_p in
wi::lrshift in wide-int.h. Add a check with PR 65656 testcase to verify
that C++ __builtin_constant_p works properly.
gcc/
PR c++/69399
* configure.ac: Check if C++ __builtin_constant_p works
properly.
(HAVE_WORKING_CXX_BUILTIN_CONSTANT_P): AC_DEFINE.
* system.h (STATIC_CONSTANT_P): Use __builtin_constant_p only
if HAVE_WORKING_CXX_BUILTIN_CONSTANT_P is defined.
* config.in: Regenerated.
* configure: Likewise.
gcc/testsuite/
PR c++/69399
* gcc.dg/torture/pr69399.c: New test.
Diffstat (limited to 'gcc/testsuite/gcc.dg/torture/pr69399.c')
| -rw-r--r-- | gcc/testsuite/gcc.dg/torture/pr69399.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/torture/pr69399.c b/gcc/testsuite/gcc.dg/torture/pr69399.c new file mode 100644 index 00000000000..3e171695c52 --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr69399.c @@ -0,0 +1,21 @@ +/* { dg-do run { target int128 } } */ + +typedef __UINT64_TYPE__ u64; +typedef unsigned __int128 u128; + +static unsigned __attribute__((noinline, noclone)) +foo(u64 u) +{ + u128 v = u | 0xffffff81; + v >>= 64; + return v; +} + +int +main() +{ + unsigned x = foo(27); + if (x != 0) + __builtin_abort(); + return 0; +} |