changeset 1d4dbb357560 in /z/repo/m5
details: http://repo.m5sim.org/m5?cmd=changeset;node=1d4dbb357560
description:
X86: Fix the overflow bit for rotate right with carry.
diffstat:
1 file changed, 4 insertions(+), 2 deletions(-)
src/arch/x86/isa/microops/regop.isa | 6 ++++--
diffs (21 lines):
diff -r 751b06abbaae -r 1d4dbb357560 src/arch/x86/isa/microops/regop.isa
--- a/src/arch/x86/isa/microops/regop.isa Wed Aug 05 03:01:07 2009 -0700
+++ b/src/arch/x86/isa/microops/regop.isa Wed Aug 05 03:01:23 2009 -0700
@@ -777,13 +777,15 @@
flag_code = '''
// If the shift amount is zero, no flags should be modified.
if (shiftAmt) {
+ int origCFBit = (ccFlagBits & CFBit) ? 1 : 0;
//Zero out any flags we might modify. This way we only have to
//worry about setting them.
ccFlagBits = ccFlagBits & ~(ext & (CFBit | ECFBit | OFBit));
//Figure out what the OF bit should be.
- if ((ext & OFBit) && ((ccFlagBits & CFBit) ^
- bits(SrcReg1, dataSize * 8 - 1)))
+ if ((ext & OFBit) && (origCFBit ^
+ bits(SrcReg1, dataSize * 8 - 1))) {
ccFlagBits = ccFlagBits | OFBit;
+ }
//If some combination of the CF bits need to be set, set them.
if ((ext & (CFBit | ECFBit)) && bits(SrcReg1, shiftAmt - 1))
ccFlagBits = ccFlagBits | (ext & (CFBit | ECFBit));
_______________________________________________
m5-dev mailing list
[email protected]
http://m5sim.org/mailman/listinfo/m5-dev
