sanchayanmaity/gem5
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

X86: Fix the carry flag for shr.

Browse source
This commit is contained in:
Gabe Black 2009-08-05 02:56:49 -07:00
parent 22a5f66820
commit a238959c34
1 changed files with 4 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
src/arch/x86/isa/microops/regop.isa
View file

@ -680,8 +680,11 @@ let {{
//worry about setting them.
ccFlagBits = ccFlagBits & ~(ext & (CFBit | ECFBit | OFBit));
//If some combination of the CF bits need to be set, set them.
if ((ext & (CFBit | ECFBit)) && bits(SrcReg1, shiftAmt - 1))
if ((ext & (CFBit | ECFBit)) &&
shiftAmt <= dataSize * 8 &&
bits(SrcReg1, shiftAmt - 1)) {
ccFlagBits = ccFlagBits | (ext & (CFBit | ECFBit));
}
//Figure out what the OF bit should be.
if ((ext & OFBit) && bits(SrcReg1, dataSize * 8 - 1))
ccFlagBits = ccFlagBits | OFBit;