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author | Gabe Black <gblack@eecs.umich.edu> | 2010-06-02 12:58:06 -0500 |
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committer | Gabe Black <gblack@eecs.umich.edu> | 2010-06-02 12:58:06 -0500 |
commit | 61b8e332253510c3c033153303b0a9ef09a31f1e (patch) | |
tree | 2759bddff5f2ed78f7cb18cf08c201e8ca1d378d /src/arch/arm/isa/insts | |
parent | c96f03a2507dd8445ee3abe2f81df919c4cc5e58 (diff) | |
download | gem5-61b8e332253510c3c033153303b0a9ef09a31f1e.tar.xz |
ARM: Implement the saturation instructions.
Diffstat (limited to 'src/arch/arm/isa/insts')
-rw-r--r-- | src/arch/arm/isa/insts/misc.isa | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/arch/arm/isa/insts/misc.isa b/src/arch/arm/isa/insts/misc.isa index 3195bea65..db0bfac18 100644 --- a/src/arch/arm/isa/insts/misc.isa +++ b/src/arch/arm/isa/insts/misc.isa @@ -153,4 +153,78 @@ let {{ header_output += RevOpDeclare.subst(revshIop) decoder_output += RevOpConstructor.subst(revshIop) exec_output += PredOpExecute.subst(revshIop) + + ssatCode = ''' + int32_t operand = shift_rm_imm(Op1, shiftAmt, shiftType, 0); + int32_t res; + if (satInt(res, operand, satImm)) + CondCodes = CondCodes | (1 << 27); + else + CondCodes = CondCodes; + Dest = res; + ''' + ssatIop = InstObjParams("ssat", "Ssat", "SatShiftOp", + { "code": ssatCode, + "predicate_test": predicateTest }, []) + header_output += SatShiftOpDeclare.subst(ssatIop) + decoder_output += SatShiftOpConstructor.subst(ssatIop) + exec_output += PredOpExecute.subst(ssatIop) + + usatCode = ''' + int32_t operand = shift_rm_imm(Op1, shiftAmt, shiftType, 0); + int32_t res; + if (uSatInt(res, operand, satImm)) + CondCodes = CondCodes | (1 << 27); + else + CondCodes = CondCodes; + Dest = res; + ''' + usatIop = InstObjParams("usat", "Usat", "SatShiftOp", + { "code": usatCode, + "predicate_test": predicateTest }, []) + header_output += SatShiftOpDeclare.subst(usatIop) + decoder_output += SatShiftOpConstructor.subst(usatIop) + exec_output += PredOpExecute.subst(usatIop) + + ssat16Code = ''' + int32_t res; + uint32_t resTemp = 0; + CondCodes = CondCodes; + int32_t argLow = sext<16>(bits(Op1, 15, 0)); + int32_t argHigh = sext<16>(bits(Op1, 31, 16)); + if (satInt(res, argLow, satImm)) + CondCodes = CondCodes | (1 << 27); + replaceBits(resTemp, 15, 0, res); + if (satInt(res, argHigh, satImm)) + CondCodes = CondCodes | (1 << 27); + replaceBits(resTemp, 31, 16, res); + Dest = resTemp; + ''' + ssat16Iop = InstObjParams("ssat16", "Ssat16", "SatOp", + { "code": ssat16Code, + "predicate_test": predicateTest }, []) + header_output += SatOpDeclare.subst(ssat16Iop) + decoder_output += SatOpConstructor.subst(ssat16Iop) + exec_output += PredOpExecute.subst(ssat16Iop) + + usat16Code = ''' + int32_t res; + uint32_t resTemp = 0; + CondCodes = CondCodes; + int32_t argLow = sext<16>(bits(Op1, 15, 0)); + int32_t argHigh = sext<16>(bits(Op1, 31, 16)); + if (uSatInt(res, argLow, satImm)) + CondCodes = CondCodes | (1 << 27); + replaceBits(resTemp, 15, 0, res); + if (uSatInt(res, argHigh, satImm)) + CondCodes = CondCodes | (1 << 27); + replaceBits(resTemp, 31, 16, res); + Dest = resTemp; + ''' + usat16Iop = InstObjParams("usat16", "Usat16", "SatOp", + { "code": usat16Code, + "predicate_test": predicateTest }, []) + header_output += SatOpDeclare.subst(usat16Iop) + decoder_output += SatOpConstructor.subst(usat16Iop) + exec_output += PredOpExecute.subst(usat16Iop) }}; |