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ARM: Implement the ssub instructions.

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This commit is contained in:
Gabe Black 2010-06-02 12:58:06 -05:00
parent bcf0454864
commit fd6e9f304e
1 changed files with 37 additions and 4 deletions
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41
src/arch/arm/isa/insts/data.isa
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@ -369,8 +369,8 @@ let {{
for (unsigned i = 0; i < 4; i++) {
int high = (i + 1) * 8 - 1;
int low = i * 8;
int32_t midRes = sext<8>(bits(Op1, high, low)) +
sext<8>(bits(Op2, high, low));
int32_t midRes = sext<8>(bits(Op1.sw, high, low)) +
sext<8>(bits(Op2.sw, high, low));
replaceBits(resTemp, high, low, midRes);
if (midRes >= 0) {
geBits = geBits | (1 << i);
@ -385,8 +385,41 @@ let {{
for (unsigned i = 0; i < 2; i++) {
int high = (i + 1) * 16 - 1;
int low = i * 16;
int32_t midRes = sext<16>(bits(Op1, high, low)) +
sext<16>(bits(Op2, high, low));
int32_t midRes = sext<16>(bits(Op1.sw, high, low)) +
sext<16>(bits(Op2.sw, high, low));
replaceBits(resTemp, high, low, midRes);
if (midRes >= 0) {
geBits = geBits | (0x3 << (i * 2));
}
}
Dest = resTemp;
resTemp = geBits;
''', flagType="ge", buildNonCc=False)
buildRegDataInst("ssub8", '''
uint32_t geBits = 0;
resTemp = 0;
for (unsigned i = 0; i < 4; i++) {
int high = (i + 1) * 8 - 1;
int low = i * 8;
int32_t midRes = sext<8>(bits(Op1.sw, high, low)) -
sext<8>(bits(Op2.sw, high, low));
replaceBits(resTemp, high, low, midRes);
if (midRes >= 0) {
geBits = geBits | (1 << i);
}
}
Dest = resTemp;
resTemp = geBits;
''', flagType="ge", buildNonCc=False)
buildRegDataInst("ssub16", '''
uint32_t geBits = 0;
resTemp = 0;
for (unsigned i = 0; i < 2; i++) {
int high = (i + 1) * 16 - 1;
int low = i * 16;
int32_t midRes = sext<16>(bits(Op1.sw, high, low)) -
sext<16>(bits(Op2.sw, high, low));
replaceBits(resTemp, high, low, midRes);
if (midRes >= 0) {
geBits = geBits | (0x3 << (i * 2));