X86: Put the result used for flags in an intermediate variable.
Using the destination register directly causes the ISA parser to treat it as a source even if none of the original bits are used.
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b046f3feb6
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bce2be525d
3 changed files with 22 additions and 20 deletions
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@ -50,9 +50,6 @@ namespace X86ISA
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bool subtract) const
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{
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DPRINTF(X86, "flagMask = %#x\n", flagMask);
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if (_destRegIdx[0] & IntFoldBit) {
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_dest >>= 8;
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}
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uint64_t flags = oldFlags & ~flagMask;
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if(flagMask & (ECFBit | CFBit))
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{
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@ -114,6 +114,7 @@ output exec {{
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#include "arch/x86/regs/misc.hh"
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#include "arch/x86/tlb.hh"
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#include "base/bigint.hh"
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#include "base/compiler.hh"
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#include "base/condcodes.hh"
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#include "cpu/base.hh"
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#include "cpu/exetrace.hh"
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@ -51,6 +51,8 @@ def template MicroRegOpExecute {{
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%(op_decl)s;
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%(op_rd)s;
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IntReg result M5_VAR_USED;
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if(%(cond_check)s)
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{
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%(code)s;
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@ -79,6 +81,8 @@ def template MicroRegOpImmExecute {{
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%(op_decl)s;
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%(op_rd)s;
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IntReg result M5_VAR_USED;
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if(%(cond_check)s)
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{
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%(code)s;
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@ -434,7 +438,7 @@ let {{
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flag_code = '''
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//Don't have genFlags handle the OF or CF bits
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uint64_t mask = CFBit | ECFBit | OFBit;
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ccFlagBits = genFlags(ccFlagBits, ext & ~mask, DestReg, psrc1, op2);
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ccFlagBits = genFlags(ccFlagBits, ext & ~mask, result, psrc1, op2);
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//If a logic microop wants to set these, it wants to set them to 0.
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ccFlagBits &= ~(CFBit & ext);
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ccFlagBits &= ~(ECFBit & ext);
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@ -444,12 +448,12 @@ let {{
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class FlagRegOp(RegOp):
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abstract = True
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flag_code = \
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"ccFlagBits = genFlags(ccFlagBits, ext, DestReg, psrc1, op2);"
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"ccFlagBits = genFlags(ccFlagBits, ext, result, psrc1, op2);"
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class SubRegOp(RegOp):
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abstract = True
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flag_code = \
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"ccFlagBits = genFlags(ccFlagBits, ext, DestReg, psrc1, ~op2, true);"
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"ccFlagBits = genFlags(ccFlagBits, ext, result, psrc1, ~op2, true);"
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class CondRegOp(RegOp):
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abstract = True
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@ -471,44 +475,44 @@ let {{
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src1, src2, flags, dataSize)
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class Add(FlagRegOp):
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code = 'DestReg = merge(DestReg, psrc1 + op2, dataSize);'
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big_code = 'DestReg = (psrc1 + op2) & mask(dataSize * 8);'
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code = 'DestReg = merge(DestReg, result = (psrc1 + op2), dataSize);'
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big_code = 'DestReg = result = (psrc1 + op2) & mask(dataSize * 8);'
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class Or(LogicRegOp):
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code = 'DestReg = merge(DestReg, psrc1 | op2, dataSize);'
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big_code = 'DestReg = (psrc1 | op2) & mask(dataSize * 8);'
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code = 'DestReg = merge(DestReg, result = (psrc1 | op2), dataSize);'
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big_code = 'DestReg = result = (psrc1 | op2) & mask(dataSize * 8);'
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class Adc(FlagRegOp):
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code = '''
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CCFlagBits flags = ccFlagBits;
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DestReg = merge(DestReg, psrc1 + op2 + flags.cf, dataSize);
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DestReg = merge(DestReg, result = (psrc1 + op2 + flags.cf), dataSize);
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'''
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big_code = '''
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CCFlagBits flags = ccFlagBits;
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DestReg = (psrc1 + op2 + flags.cf) & mask(dataSize * 8);
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DestReg = result = (psrc1 + op2 + flags.cf) & mask(dataSize * 8);
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'''
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class Sbb(SubRegOp):
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code = '''
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CCFlagBits flags = ccFlagBits;
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DestReg = merge(DestReg, psrc1 - op2 - flags.cf, dataSize);
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DestReg = merge(DestReg, result = (psrc1 - op2 - flags.cf), dataSize);
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'''
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big_code = '''
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CCFlagBits flags = ccFlagBits;
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DestReg = (psrc1 - op2 - flags.cf) & mask(dataSize * 8);
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DestReg = result = (psrc1 - op2 - flags.cf) & mask(dataSize * 8);
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'''
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class And(LogicRegOp):
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code = 'DestReg = merge(DestReg, psrc1 & op2, dataSize)'
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big_code = 'DestReg = (psrc1 & op2) & mask(dataSize * 8)'
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code = 'DestReg = merge(DestReg, result = (psrc1 & op2), dataSize)'
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big_code = 'DestReg = result = (psrc1 & op2) & mask(dataSize * 8)'
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class Sub(SubRegOp):
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code = 'DestReg = merge(DestReg, psrc1 - op2, dataSize)'
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big_code = 'DestReg = (psrc1 - op2) & mask(dataSize * 8)'
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code = 'DestReg = merge(DestReg, result = (psrc1 - op2), dataSize)'
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big_code = 'DestReg = result = (psrc1 - op2) & mask(dataSize * 8)'
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class Xor(LogicRegOp):
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code = 'DestReg = merge(DestReg, psrc1 ^ op2, dataSize)'
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big_code = 'DestReg = (psrc1 ^ op2) & mask(dataSize * 8)'
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code = 'DestReg = merge(DestReg, result = (psrc1 ^ op2), dataSize)'
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big_code = 'DestReg = result = (psrc1 ^ op2) & mask(dataSize * 8)'
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class Mul1s(WrRegOp):
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code = '''
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