Vendor import of llvm trunk r178860:

http://llvm.org/svn/llvm-project/llvm/trunk@178860

1 files changed, 18 insertions, 4 deletions

diff --git a/include/llvm/Support/MathExtras.h b/include/llvm/Support/MathExtras.h
index 11f9e63..d6ae58d 100644
--- a/include/llvm/Support/MathExtras.h
+++ b/include/llvm/Support/MathExtras.h
@@ -16,6 +16,10 @@
 
 #include "llvm/Support/SwapByteOrder.h"
 
+#ifdef _MSC_VER
+# include <intrin.h>
+#endif
+
 namespace llvm {
 
 // NOTE: The following support functions use the _32/_64 extensions instead of
@@ -61,7 +65,7 @@ inline bool isShiftedInt(int64_t x) {
 /// isUInt - Checks if an unsigned integer fits into the given bit width.
 template<unsigned N>
 inline bool isUInt(uint64_t x) {
-  return N >= 64 || x < (UINT64_C(1)<<N);
+  return N >= 64 || x < (UINT64_C(1)<<(N));
 }
 // Template specializations to get better code for common cases.
 template<>
@@ -254,7 +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
 }
 
@@ -281,7 +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
 }
 
@@ -416,7 +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)