X86: Make the cvti2f microop sign extend its integer source correctly.

The code was using the wrong bit as the sign bit. Other similar bits of code
seem to be correct.

diff --git a/src/arch/x86/isa/microops/mediaop.isa b/src/arch/x86/isa/microops/mediaop.isa
index 900c166f88a6d52c43f417c7b097dc1ed2c52dbb..9a2707b5985d34754bfb966843ddfb9087430a4c 100644 (file)
--- a/src/arch/x86/isa/microops/mediaop.isa
+++ b/src/arch/x86/isa/microops/mediaop.isa
@@ -1294,7 +1294,8 @@ let {{
                 int srcLoIndex = srcStart + (i + 0) * srcSizeBits;
                 uint64_t argBits = bits(FpSrcReg1.uqw, srcHiIndex, srcLoIndex);
 
-                int64_t sArg = argBits | (0 - (argBits & (ULL(1) << srcHiIndex)));
+                int64_t sArg = argBits |
+                    (0 - (argBits & (ULL(1) << (srcSizeBits - 1))));
                 double arg = sArg;
 
                 if (destSize == 4) {