Implement __umulh with __int128 arithmetic

Use the same approach as _umul128, but just return the high half.

llvm-svn: 223316

1 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/Headers/Intrin.h b/clang/lib/Headers/Intrin.h
index 8cd4a0dbf01..84bc4303a13 100644
--- a/clang/lib/Headers/Intrin.h
+++ b/clang/lib/Headers/Intrin.h
@@ -330,7 +330,6 @@ unsigned __int64 __shiftright128(unsigned __int64 _LowPart,
                                  unsigned char _Shift);
 static __inline__
 void __stosq(unsigned __int64 *, unsigned __int64, size_t);
-unsigned __int64 __umulh(unsigned __int64, unsigned __int64);
 unsigned char __vmx_on(unsigned __int64 *);
 unsigned char __vmx_vmclear(unsigned __int64 *);
 unsigned char __vmx_vmlaunch(void);
@@ -429,6 +428,12 @@ _umul128(unsigned __int64 _Multiplier, unsigned __int64 _Multiplicand,
   *_HighProduct = _FullProduct >> 64;
   return _FullProduct;
 }
+static __inline__ unsigned __int64 __attribute__((__always_inline__, __nodebug__))
+__umulh(unsigned __int64 _Multiplier, unsigned __int64 _Multiplicand) {
+  unsigned __int128 _FullProduct =
+      (unsigned __int128)_Multiplier * (unsigned __int128)_Multiplicand;
+  return _FullProduct >> 64;
+}
 void __cdecl _xrstor64(void const *, unsigned __int64);
 void __cdecl _xsave64(void *, unsigned __int64);
 void __cdecl _xsaveopt64(void *, unsigned __int64);