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ARM: Implement the unsigned saturating instructions.

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This commit is contained in:
Gabe Black 2010-06-02 12:58:06 -05:00
parent 5495ebd68d
commit be888e67e7
2 changed files with 90 additions and 0 deletions
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17
src/arch/arm/insts/static_inst.hh
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@ -77,6 +77,23 @@ class ArmStaticInst : public StaticInst
}
}
template<int width>
static bool
uSaturateOp(uint32_t &res, int64_t op1, int64_t op2, bool sub=false)
{
int64_t midRes = sub ? (op1 - op2) : (op1 + op2);
if (midRes >= (1 << width)) {
res = (1 << width) - 1;
return true;
} else if (midRes < 0) {
res = 0;
return true;
} else {
res = midRes;
return false;
}
}
// Constructor
ArmStaticInst(const char *mnem, ExtMachInst _machInst,
OpClass __opClass)

73
src/arch/arm/isa/insts/data.isa
View file

@ -428,4 +428,77 @@ let {{
Dest = resTemp;
resTemp = geBits;
''', flagType="ge", buildNonCc=False)
buildRegDataInst("uqadd16", '''
uint32_t midRes;
for (unsigned i = 0; i < 2; i++) {
int high = (i + 1) * 16 - 1;
int low = i * 16;
uint64_t arg1 = bits(Op1, high, low);
uint64_t arg2 = bits(Op2, high, low);
uSaturateOp<16>(midRes, arg1, arg2);
replaceBits(resTemp, high, low, midRes);
}
Dest = resTemp;
''', flagType="none", buildCc=False)
buildRegDataInst("uqadd8", '''
uint32_t midRes;
for (unsigned i = 0; i < 4; i++) {
int high = (i + 1) * 8 - 1;
int low = i * 8;
uint64_t arg1 = bits(Op1, high, low);
uint64_t arg2 = bits(Op2, high, low);
uSaturateOp<8>(midRes, arg1, arg2);
replaceBits(resTemp, high, low, midRes);
}
Dest = resTemp;
''', flagType="none", buildCc=False)
buildRegDataInst("uqsub16", '''
uint32_t midRes;
for (unsigned i = 0; i < 2; i++) {
int high = (i + 1) * 16 - 1;
int low = i * 16;
uint64_t arg1 = bits(Op1, high, low);
uint64_t arg2 = bits(Op2, high, low);
uSaturateOp<16>(midRes, arg1, arg2, true);
replaceBits(resTemp, high, low, midRes);
}
Dest = resTemp;
''', flagType="none", buildCc=False)
buildRegDataInst("uqsub8", '''
uint32_t midRes;
for (unsigned i = 0; i < 4; i++) {
int high = (i + 1) * 8 - 1;
int low = i * 8;
uint64_t arg1 = bits(Op1, high, low);
uint64_t arg2 = bits(Op2, high, low);
uSaturateOp<8>(midRes, arg1, arg2, true);
replaceBits(resTemp, high, low, midRes);
}
Dest = resTemp;
''', flagType="none", buildCc=False)
buildRegDataInst("uqasx", '''
uint32_t midRes;
uint64_t arg1Low = bits(Op1.sw, 15, 0);
uint64_t arg1High = bits(Op1.sw, 31, 16);
uint64_t arg2Low = bits(Op2.sw, 15, 0);
uint64_t arg2High = bits(Op2.sw, 31, 16);
uSaturateOp<16>(midRes, arg1Low, arg2High, true);
replaceBits(resTemp, 15, 0, midRes);
uSaturateOp<16>(midRes, arg1High, arg2Low);
replaceBits(resTemp, 31, 16, midRes);
Dest = resTemp;
''', flagType="none", buildCc=False)
buildRegDataInst("uqsax", '''
uint32_t midRes;
uint64_t arg1Low = bits(Op1.sw, 15, 0);
uint64_t arg1High = bits(Op1.sw, 31, 16);
uint64_t arg2Low = bits(Op2.sw, 15, 0);
uint64_t arg2High = bits(Op2.sw, 31, 16);
uSaturateOp<16>(midRes, arg1Low, arg2High);
replaceBits(resTemp, 15, 0, midRes);
uSaturateOp<16>(midRes, arg1High, arg2Low, true);
replaceBits(resTemp, 31, 16, midRes);
Dest = resTemp;
''', flagType="none", buildCc=False)
}};