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authorGabe Black <gblack@eecs.umich.edu>2011-02-13 17:45:12 -0800
committerGabe Black <gblack@eecs.umich.edu>2011-02-13 17:45:12 -0800
commitbce2be525d0ff05af914515bc2d9e9ac9d66a123 (patch)
tree694ada6849dae89a98746529cc87cde646d8172c /src/arch/x86/isa/microops
parentb046f3feb6e54f128e8868fcb807d0d5ac0d7ba7 (diff)
downloadgem5-bce2be525d0ff05af914515bc2d9e9ac9d66a123.tar.xz
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.
Diffstat (limited to 'src/arch/x86/isa/microops')
-rw-r--r--src/arch/x86/isa/microops/regop.isa38
1 files changed, 21 insertions, 17 deletions
diff --git a/src/arch/x86/isa/microops/regop.isa b/src/arch/x86/isa/microops/regop.isa
index 158bfdd59..e2a51c127 100644
--- a/src/arch/x86/isa/microops/regop.isa
+++ b/src/arch/x86/isa/microops/regop.isa
@@ -51,6 +51,8 @@ def template MicroRegOpExecute {{
%(op_decl)s;
%(op_rd)s;
+ IntReg result M5_VAR_USED;
+
if(%(cond_check)s)
{
%(code)s;
@@ -79,6 +81,8 @@ def template MicroRegOpImmExecute {{
%(op_decl)s;
%(op_rd)s;
+ IntReg result M5_VAR_USED;
+
if(%(cond_check)s)
{
%(code)s;
@@ -434,7 +438,7 @@ let {{
flag_code = '''
//Don't have genFlags handle the OF or CF bits
uint64_t mask = CFBit | ECFBit | OFBit;
- ccFlagBits = genFlags(ccFlagBits, ext & ~mask, DestReg, psrc1, op2);
+ ccFlagBits = genFlags(ccFlagBits, ext & ~mask, result, psrc1, op2);
//If a logic microop wants to set these, it wants to set them to 0.
ccFlagBits &= ~(CFBit & ext);
ccFlagBits &= ~(ECFBit & ext);
@@ -444,12 +448,12 @@ let {{
class FlagRegOp(RegOp):
abstract = True
flag_code = \
- "ccFlagBits = genFlags(ccFlagBits, ext, DestReg, psrc1, op2);"
+ "ccFlagBits = genFlags(ccFlagBits, ext, result, psrc1, op2);"
class SubRegOp(RegOp):
abstract = True
flag_code = \
- "ccFlagBits = genFlags(ccFlagBits, ext, DestReg, psrc1, ~op2, true);"
+ "ccFlagBits = genFlags(ccFlagBits, ext, result, psrc1, ~op2, true);"
class CondRegOp(RegOp):
abstract = True
@@ -471,44 +475,44 @@ let {{
src1, src2, flags, dataSize)
class Add(FlagRegOp):
- code = 'DestReg = merge(DestReg, psrc1 + op2, dataSize);'
- big_code = 'DestReg = (psrc1 + op2) & mask(dataSize * 8);'
+ code = 'DestReg = merge(DestReg, result = (psrc1 + op2), dataSize);'
+ big_code = 'DestReg = result = (psrc1 + op2) & mask(dataSize * 8);'
class Or(LogicRegOp):
- code = 'DestReg = merge(DestReg, psrc1 | op2, dataSize);'
- big_code = 'DestReg = (psrc1 | op2) & mask(dataSize * 8);'
+ code = 'DestReg = merge(DestReg, result = (psrc1 | op2), dataSize);'
+ big_code = 'DestReg = result = (psrc1 | op2) & mask(dataSize * 8);'
class Adc(FlagRegOp):
code = '''
CCFlagBits flags = ccFlagBits;
- DestReg = merge(DestReg, psrc1 + op2 + flags.cf, dataSize);
+ DestReg = merge(DestReg, result = (psrc1 + op2 + flags.cf), dataSize);
'''
big_code = '''
CCFlagBits flags = ccFlagBits;
- DestReg = (psrc1 + op2 + flags.cf) & mask(dataSize * 8);
+ DestReg = result = (psrc1 + op2 + flags.cf) & mask(dataSize * 8);
'''
class Sbb(SubRegOp):
code = '''
CCFlagBits flags = ccFlagBits;
- DestReg = merge(DestReg, psrc1 - op2 - flags.cf, dataSize);
+ DestReg = merge(DestReg, result = (psrc1 - op2 - flags.cf), dataSize);
'''
big_code = '''
CCFlagBits flags = ccFlagBits;
- DestReg = (psrc1 - op2 - flags.cf) & mask(dataSize * 8);
+ DestReg = result = (psrc1 - op2 - flags.cf) & mask(dataSize * 8);
'''
class And(LogicRegOp):
- code = 'DestReg = merge(DestReg, psrc1 & op2, dataSize)'
- big_code = 'DestReg = (psrc1 & op2) & mask(dataSize * 8)'
+ code = 'DestReg = merge(DestReg, result = (psrc1 & op2), dataSize)'
+ big_code = 'DestReg = result = (psrc1 & op2) & mask(dataSize * 8)'
class Sub(SubRegOp):
- code = 'DestReg = merge(DestReg, psrc1 - op2, dataSize)'
- big_code = 'DestReg = (psrc1 - op2) & mask(dataSize * 8)'
+ code = 'DestReg = merge(DestReg, result = (psrc1 - op2), dataSize)'
+ big_code = 'DestReg = result = (psrc1 - op2) & mask(dataSize * 8)'
class Xor(LogicRegOp):
- code = 'DestReg = merge(DestReg, psrc1 ^ op2, dataSize)'
- big_code = 'DestReg = (psrc1 ^ op2) & mask(dataSize * 8)'
+ code = 'DestReg = merge(DestReg, result = (psrc1 ^ op2), dataSize)'
+ big_code = 'DestReg = result = (psrc1 ^ op2) & mask(dataSize * 8)'
class Mul1s(WrRegOp):
code = '''