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Fixed width parameter and provided a parameter to flip the carry bit on subtract.

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--HG--
extra : convert_revision : d01bb791b000a2fdfc8600f8fb2f8aadd52b0b63
This commit is contained in:
Gabe Black 2007-07-20 14:52:44 -07:00
parent cfadef74d1
commit 0781609693
2 changed files with 21 additions and 12 deletions
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30
src/arch/x86/insts/microregop.cc
View file

@ -63,24 +63,32 @@
namespace X86ISA
{
uint64_t RegOpBase::genFlags(uint64_t oldFlags, uint64_t flagMask,
uint64_t _dest, uint64_t _src1, uint64_t _src2) const
uint64_t _dest, uint64_t _src1, uint64_t _src2,
bool subtract) const
{
DPRINTF(Sparc, "flagMask = %#x\n", flagMask);
uint64_t flags = oldFlags & ~flagMask;
if(flagMask & CFBit && findCarry(dataSize, _dest, _src1, _src2))
flags |= CFBit;
if(flagMask & PFBit && findParity(dataSize, _dest))
if(flagMask & CFBit)
if(findCarry(dataSize*8, _dest, _src1, _src2))
flags |= CFBit;
if(subtract)
flags ^= CFBit;
if(flagMask & PFBit && findParity(dataSize*8, _dest))
flags |= PFBit;
if(flagMask & ECFBit && findCarry(dataSize, _dest, _src1, _src2))
if(flagMask & ECFBit && findCarry(dataSize*8, _dest, _src1, _src2))
flags |= ECFBit;
if(flagMask & AFBit && findCarry(4, _dest, _src1, _src2))
flags |= AFBit;
if(flagMask & EZFBit && findZero(dataSize, _dest))
if(flagMask & AFBit)
if(findCarry(4, _dest, _src1, _src2))
flags |= AFBit;
if(subtract)
flags ^= AFBit;
if(flagMask & EZFBit && findZero(dataSize*8, _dest))
flags |= EZFBit;
if(flagMask & ZFBit && findZero(dataSize, _dest))
if(flagMask & ZFBit && findZero(dataSize*8, _dest))
flags |= ZFBit;
if(flagMask & SFBit && findNegative(dataSize, _dest))
if(flagMask & SFBit && findNegative(dataSize*8, _dest))
flags |= SFBit;
if(flagMask & OFBit && findOverflow(dataSize, _dest, _src1, _src2))
if(flagMask & OFBit && findOverflow(dataSize*8, _dest, _src1, _src2))
flags |= OFBit;
return flags;
}

3
src/arch/x86/insts/microregop.hh
View file

@ -132,7 +132,8 @@ namespace X86ISA
//Figure out what the condition code flags should be.
uint64_t genFlags(uint64_t oldFlags, uint64_t flagMask,
uint64_t _dest, uint64_t _src1, uint64_t _src2) const;
uint64_t _dest, uint64_t _src1, uint64_t _src2,
bool subtract = false) const;
bool checkCondition(uint64_t flags) const;
};