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builtins: implement instrinics for cl 

cl does not support the same intrinsics as clang.  Provide implementations for
the intrinsics using MSVC builtins.

Patch by Tee Hao Wei!

llvm-svn: 249515
This commit is contained in:
Saleem Abdulrasool 2015-10-07 02:58:11 +00:00
parent b0b7c8a8dd
commit 396e794459
1 changed files with 28 additions and 0 deletions
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28
compiler-rt/lib/builtins/int_lib.h
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@ -88,4 +88,32 @@ COMPILER_RT_ABI si_int __clzti2(ti_int a);
COMPILER_RT_ABI tu_int __udivmodti4(tu_int a, tu_int b, tu_int* rem);
#endif
/* Definitions for builtins unavailable on MSVC */
#if defined(_MSC_VER) && !defined(__clang__)
#include <intrin.h>
uint32_t __inline __builtin_ctz(uint32_t value) {
uint32_t trailing_zero = 0;
if (_BitScanForward(&trailing_zero, value))
return trailing_zero;
return 32;
}
uint32_t __inline __builtin_clz(uint32_t value) {
uint32_t leading_zero = 0;
if (_BitScanReverse(&leading_zero, value))
return 31 - leading_zero;
return 32;
}
uint32_t __inline __builtin_clzll(uint64_t value) {
uint32_t leading_zero = 0;
if (_BitScanReverse64(&leading_zero, value))
return 63 - leading_zero;
return 64;
}
#define __builtin_clzl __builtin_clzll
#endif
#endif /* INT_LIB_H */