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Compiler.h: Leave LLVM_BUILTIN_UNREACHABLE undefined if it is unavailable in host compiler.

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Users of LLVM_BUILTIN_UNREACHABLE should be responsible in the case when LLVM_BUILTIN_UNREACHABLE is undefined.

Actually, (0, (p)) in LLVM_ASSUME_ALIGNED(p, a) caused thousands of warnings on g++-4.4. It was a motivation in this commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171455 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi 2013-01-03 03:30:22 +00:00
parent 82860f63e1
commit 1eae141f19
1 changed files with 3 additions and 3 deletions
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6
include/llvm/Support/Compiler.h
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@ -225,8 +225,6 @@
# define LLVM_BUILTIN_UNREACHABLE __builtin_unreachable()
#elif defined(_MSC_VER)
# define LLVM_BUILTIN_UNREACHABLE __assume(false)
#else
# define LLVM_BUILTIN_UNREACHABLE 0
#endif
/// LLVM_BUILTIN_TRAP - On compilers which support it, expands to an expression
@ -244,9 +242,11 @@
|| (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))
// FIXME: Enable on clang when it supports it.
# define LLVM_ASSUME_ALIGNED(p, a) __builtin_assume_aligned(p, a)
#else
#elif defined(LLVM_BUILTIN_UNREACHABLE)
# define LLVM_ASSUME_ALIGNED(p, a) \
(((uintptr_t(p) % (a)) == 0) ? (p) : (LLVM_BUILTIN_UNREACHABLE, (p)))
#else
# define LLVM_ASSUME_ALIGNED(p, a) (p)
#endif
#endif