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Use gnu style builtins in MathExtras.h with clang on Windows 

Clang does not provide BitScan* intrinsic implementations yet.

llvm-svn: 187813
This commit is contained in:
Reid Kleckner 2013-08-06 19:45:27 +00:00
parent b75e0c92f3
commit 1c767e6076
1 changed files with 4 additions and 4 deletions
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8
llvm/include/llvm/Support/MathExtras.h
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@ -80,7 +80,7 @@ inline std::size_t countTrailingZeros<uint32_t>(uint32_t Val, ZeroBehavior ZB) {
if (ZB != ZB_Undefined && Val == 0)
return 32;
#if __GNUC__ >= 4
#if __has_builtin(__builtin_ctz) || __GNUC_PREREQ(4, 0)
return __builtin_ctz(Val);
#elif _MSC_VER
unsigned long Index;
@ -95,7 +95,7 @@ inline std::size_t countTrailingZeros<uint64_t>(uint64_t Val, ZeroBehavior ZB) {
if (ZB != ZB_Undefined && Val == 0)
return 64;
#if __GNUC__ >= 4
#if __has_builtin(__builtin_ctzll) || __GNUC_PREREQ(4, 0)
return __builtin_ctzll(Val);
#elif _MSC_VER
unsigned long Index;
@ -146,7 +146,7 @@ inline std::size_t countLeadingZeros<uint32_t>(uint32_t Val, ZeroBehavior ZB) {
if (ZB != ZB_Undefined && Val == 0)
return 32;
#if __GNUC__ >= 4
#if __has_builtin(__builtin_clz) || __GNUC_PREREQ(4, 0)
return __builtin_clz(Val);
#elif _MSC_VER
unsigned long Index;
@ -161,7 +161,7 @@ inline std::size_t countLeadingZeros<uint64_t>(uint64_t Val, ZeroBehavior ZB) {
if (ZB != ZB_Undefined && Val == 0)
return 64;
#if __GNUC__ >= 4
#if __has_builtin(__builtin_clzll) || __GNUC_PREREQ(4, 0)
return __builtin_clzll(Val);
#elif _MSC_VER
unsigned long Index;