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Suppressing MSVC warnings; patch thanks to Peng Cheng!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176193 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Aaron Ballman 2013-02-27 18:25:41 +00:00
parent 512685dacf
commit b350882153
1 changed files with 13 additions and 3 deletions
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16
include/llvm/Support/MathExtras.h
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@ -258,7 +258,10 @@ inline unsigned CountTrailingZeros_32(uint32_t Value) {
4, 7, 17, 0, 25, 22, 31, 15, 29, 10, 12, 6, 0, 21, 14, 9,
5, 20, 8, 19, 18
};
return Mod37BitPosition[(-Value & Value) % 37];
// Replace "-Value" by "1+~Value" in the following commented code to avoid
// MSVC warning C4146
// return Mod37BitPosition[(-Value & Value) % 37];
return Mod37BitPosition[((1 + ~Value) & Value) % 37];
#endif
}
@ -285,7 +288,10 @@ inline unsigned CountTrailingZeros_64(uint64_t Value) {
29, 50, 43, 46, 31, 37, 21, 57, 52, 8, 26, 49, 45, 36, 56,
7, 48, 35, 6, 34, 33, 0
};
return Mod67Position[(-Value & Value) % 67];
// Replace "-Value" by "1+~Value" in the following commented code to avoid
// MSVC warning C4146
// return Mod67Position[(-Value & Value) % 67];
return Mod67Position[((1 + ~Value) & Value) % 67];
#endif
}
@ -420,7 +426,11 @@ int IsInf(double d);
/// alignment that may be assumed after adding the two together.
inline uint64_t MinAlign(uint64_t A, uint64_t B) {
// The largest power of 2 that divides both A and B.
return (A | B) & -(A | B);
//
// Replace "-Value" by "1+~Value" in the following commented code to avoid
// MSVC warning C4146
// return (A | B) & -(A | B);
return (A | B) & (1 + ~(A | B));
}
/// NextPowerOf2 - Returns the next power of two (in 64-bits)