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X86: Fix sign extension when doing an arithmetic shift right by 0.

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This commit is contained in:
Gabe Black 2009-08-05 02:57:47 -07:00
parent a238959c34
commit 860f0f8350
1 changed files with 1 additions and 1 deletions
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2
src/arch/x86/isa/microops/regop.isa
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@ -700,7 +700,7 @@ let {{
// Because what happens to the bits shift -in- on a right shift // Because what happens to the bits shift -in- on a right shift
// is not defined in the C/C++ standard, we have to sign extend // is not defined in the C/C++ standard, we have to sign extend
// them manually to be sure. // them manually to be sure.
uint64_t arithMask = uint64_t arithMask = (shiftAmt == 0) ? 0 :
-bits(psrc1, dataSize * 8 - 1) << (dataSize * 8 - shiftAmt); -bits(psrc1, dataSize * 8 - 1) << (dataSize * 8 - shiftAmt);
DestReg = merge(DestReg, (psrc1 >> shiftAmt) | arithMask, dataSize); DestReg = merge(DestReg, (psrc1 >> shiftAmt) | arithMask, dataSize);
''' '''