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thumb32: Implement QDSUB

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This commit is contained in:
Lioncash 2021-02-01 15:35:09 -05:00
parent c60cf921ee
commit d96c8c662b
3 changed files with 18 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.h
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@ -278,7 +278,7 @@ std::optional<std::reference_wrapper<const Thumb32Matcher<V>>> DecodeThumb32(u32
//INST(&V::thumb32_QADD, "QADD", "111110101000----1111----1000----"),
//INST(&V::thumb32_QDADD, "QDADD", "111110101000----1111----1001----"),
//INST(&V::thumb32_QSUB, "QSUB", "111110101000----1111----1010----"),
//INST(&V::thumb32_QDSUB, "QDSUB", "111110101000----1111----1011----"),
INST(&V::thumb32_QDSUB, "QDSUB", "111110101000nnnn1111dddd1011mmmm"),
INST(&V::thumb32_REV, "REV", "111110101001nnnn1111dddd1000mmmm"),
INST(&V::thumb32_REV16, "REV16", "111110101001nnnn1111dddd1001mmmm"),
INST(&V::thumb32_RBIT, "RBIT", "111110101001nnnn1111dddd1010mmmm"),

16
src/frontend/A32/translate/impl/thumb32_misc.cpp
View file

@ -19,6 +19,22 @@ bool ThumbTranslatorVisitor::thumb32_CLZ(Reg n, Reg d, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_QDSUB(Reg n, Reg d, Reg m) {
if (d == Reg::PC || n == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();
}
const auto reg_m = ir.GetRegister(m);
const auto reg_n = ir.GetRegister(n);
const auto doubled_n = ir.SignedSaturatedAdd(reg_n, reg_n);
ir.OrQFlag(doubled_n.overflow);
const auto result = ir.SignedSaturatedSub(reg_m, doubled_n.result);
ir.SetRegister(d, result.result);
ir.OrQFlag(result.overflow);
return true;
}
bool ThumbTranslatorVisitor::thumb32_RBIT(Reg n, Reg d, Reg m) {
if (m != n || d == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();

1
src/frontend/A32/translate/impl/translate_thumb.h
View file

@ -118,6 +118,7 @@ struct ThumbTranslatorVisitor final {
// thumb32 miscellaneous instructions
bool thumb32_CLZ(Reg n, Reg d, Reg m);
bool thumb32_QDSUB(Reg n, Reg d, Reg m);
bool thumb32_RBIT(Reg n, Reg d, Reg m);
bool thumb32_REV(Reg n, Reg d, Reg m);
bool thumb32_REV16(Reg n, Reg d, Reg m);