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| author | Gabe Black <gblack@eecs.umich.edu> | 2010-06-02 12:58:05 -0500 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2010-06-02 12:58:05 -0500 |
| commit | 4fb6fcd82d4b3cdb12ffbcd738080e9c4de7bc8a (patch) | |
| tree | 7a3c43de36f6e4fa21e14b1e37d7e717f65d511a /src | |
| parent | 30dd62262231b2b2b30aa66a8b28c6ee41afcf9e (diff) | |
| download | gem5-4fb6fcd82d4b3cdb12ffbcd738080e9c4de7bc8a.tar.xz | |
ARM: Decode the scalar saturating add/subtract instructions.
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/arm/isa/decoder/arm.isa | 7 | ||||
| -rw-r--r-- | src/arch/arm/isa/formats/data.isa | 22 |
2 files changed, 23 insertions, 6 deletions
diff --git a/src/arch/arm/isa/decoder/arm.isa b/src/arch/arm/isa/decoder/arm.isa index bfb89b22a..050571240 100644 --- a/src/arch/arm/isa/decoder/arm.isa +++ b/src/arch/arm/isa/decoder/arm.isa @@ -116,12 +116,7 @@ format DataOp { 0x3: decode OPCODE { 0x9: ArmBlxReg::armBlxReg(); } - 0x5: decode OPCODE { - 0x8: WarnUnimpl::qadd(); - 0x9: WarnUnimpl::qsub(); - 0xa: WarnUnimpl::qdadd(); - 0xb: WarnUnimpl::qdsub(); - } + 0x5: ArmSatAddSub::armSatAddSub(); } 0x1: ArmHalfWordMultAndMultAcc::armHalfWordMultAndMultAcc(); } diff --git a/src/arch/arm/isa/formats/data.isa b/src/arch/arm/isa/formats/data.isa index 355a41038..f6e093b80 100644 --- a/src/arch/arm/isa/formats/data.isa +++ b/src/arch/arm/isa/formats/data.isa @@ -341,6 +341,28 @@ def format ArmDataProcImm() {{ ''' }}; +def format ArmSatAddSub() {{ + decode_block = ''' + { + IntRegIndex rn = (IntRegIndex)(uint32_t)bits(machInst, 19, 16); + IntRegIndex rd = (IntRegIndex)(uint32_t)bits(machInst, 15, 12); + IntRegIndex rm = (IntRegIndex)(uint32_t)bits(machInst, 3, 0); + switch (OPCODE) { + case 0x8: + return new QaddRegCc(machInst, rd, rm, rn, 0, LSL); + case 0x9: + return new QsubRegCc(machInst, rd, rm, rn, 0, LSL); + case 0xa: + return new QdaddRegCc(machInst, rd, rm, rn, 0, LSL); + case 0xb: + return new QdsubRegCc(machInst, rd, rm, rn, 0, LSL); + default: + return new Unknown(machInst); + } + } + ''' +}}; + def format Thumb16ShiftAddSubMoveCmp() {{ decode_block = ''' { |