[MC] EmitNop: Make an assertion more useful.

Differential Revision:  http://reviews.llvm.org/D19334

llvm-svn: 266895

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/Target/X86/X86MCInstLower.cpp b/llvm/lib/Target/X86/X86MCInstLower.cpp
index 6a5e97b6c93..6b42943987b 100644
--- a/llvm/lib/Target/X86/X86MCInstLower.cpp
+++ b/llvm/lib/Target/X86/X86MCInstLower.cpp
@@ -837,9 +837,10 @@ static unsigned EmitNop(MCStreamer &OS, unsigned NumBytes, bool Is64Bit,
 /// \brief Emit the optimal amount of multi-byte nops on X86.
 static void EmitNops(MCStreamer &OS, unsigned NumBytes, bool Is64Bit,
                      const MCSubtargetInfo &STI) {
+  unsigned NopsToEmit = NumBytes;
   while (NumBytes) {
     NumBytes -= EmitNop(OS, NumBytes, Is64Bit, STI);
-    assert(NumBytes >= 0 && "Emitted more than I asked for!");
+    assert(NopsToEmit >= NumBytes && "Emitted more than I asked for!");
   }
 }