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thumb32: Implement QADD

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This commit is contained in:
Lioncash 2021-02-01 15:44:09 -05:00
parent cd6e4c7afd
commit 36fc596a51
4 changed files with 23 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.h
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@ -275,7 +275,7 @@ std::optional<std::reference_wrapper<const Thumb32Matcher<V>>> DecodeThumb32(u32
//INST(&V::thumb32_UHSUB8, "UHSUB8", "111110101100----1111----0110----"),
// Miscellaneous Operations
//INST(&V::thumb32_QADD, "QADD", "111110101000----1111----1000----"),
INST(&V::thumb32_QADD, "QADD", "111110101000nnnn1111dddd1000mmmm"),
INST(&V::thumb32_QDADD, "QDADD", "111110101000nnnn1111dddd1001mmmm"),
INST(&V::thumb32_QSUB, "QSUB", "111110101000nnnn1111dddd1010mmmm"),
INST(&V::thumb32_QDSUB, "QDSUB", "111110101000nnnn1111dddd1011mmmm"),

14
src/frontend/A32/translate/impl/thumb32_misc.cpp
View file

@ -19,6 +19,20 @@ bool ThumbTranslatorVisitor::thumb32_CLZ(Reg n, Reg d, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_QADD(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 result = ir.SignedSaturatedAdd(reg_m, reg_n);
ir.SetRegister(d, result.result);
ir.OrQFlag(result.overflow);
return true;
}
bool ThumbTranslatorVisitor::thumb32_QDADD(Reg n, Reg d, Reg m) {
if (d == Reg::PC || n == 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_QADD(Reg n, Reg d, Reg m);
bool thumb32_QDADD(Reg n, Reg d, Reg m);
bool thumb32_QDSUB(Reg n, Reg d, Reg m);
bool thumb32_QSUB(Reg n, Reg d, Reg m);

7
tests/A32/fuzz_thumb.cpp
View file

@ -369,6 +369,13 @@ TEST_CASE("Fuzz Thumb32 instructions set", "[JitX64][Thumb][Thumb32]") {
const auto n = Common::Bits<16, 19>(inst);
return m == n && d != 15 && m != 15;
}),
ThumbInstGen("111110101000nnnn1111dddd1000mmmm", // QADD
[](u32 inst) {
const auto d = Common::Bits<8, 11>(inst);
const auto m = Common::Bits<0, 3>(inst);
const auto n = Common::Bits<16, 19>(inst);
return d != 15 && m != 15 && n != 15;
}),
ThumbInstGen("111110101000nnnn1111dddd1001mmmm", // QDADD
[](u32 inst) {
const auto d = Common::Bits<8, 11>(inst);