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thumb32: Implement REVSH

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This commit is contained in:
Lioncash 2021-02-01 15:10:08 -05:00
parent 95dabcf48e
commit e2bc7eeb93
4 changed files with 22 additions and 2 deletions
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2
src/frontend/A32/decoder/thumb32.h
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@ -282,7 +282,7 @@ std::optional<std::reference_wrapper<const Thumb32Matcher<V>>> DecodeThumb32(u32
//INST(&V::thumb32_REV, "REV", "111110101001----1111----1000----"),
//INST(&V::thumb32_REV16, "REV16", "111110101001----1111----1001----"),
//INST(&V::thumb32_RBIT, "RBIT", "111110101001----1111----1010----"),
//INST(&V::thumb32_REVSH, "REVSH", "111110101001----1111----1011----"),
INST(&V::thumb32_REVSH, "REVSH", "111110101001nnnn1111dddd1011mmmm"),
INST(&V::thumb32_SEL, "SEL", "111110101010nnnn1111dddd1000mmmm"),
INST(&V::thumb32_CLZ, "CLZ", "111110101011nnnn1111dddd1000mmmm"),

12
src/frontend/A32/translate/impl/thumb32_misc.cpp
View file

@ -19,6 +19,18 @@ bool ThumbTranslatorVisitor::thumb32_CLZ(Reg n, Reg d, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_REVSH(Reg n, Reg d, Reg m) {
if (m != n || d == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();
}
const auto reg_m = ir.GetRegister(m);
const auto rev_half = ir.ByteReverseHalf(ir.LeastSignificantHalf(reg_m));
ir.SetRegister(d, ir.SignExtendHalfToWord(rev_half));
return true;
}
bool ThumbTranslatorVisitor::thumb32_SEL(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_REVSH(Reg n, Reg d, Reg m);
bool thumb32_SEL(Reg n, Reg d, Reg m);
};

9
tests/A32/fuzz_thumb.cpp
View file

@ -369,7 +369,14 @@ 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("111110101010nnnn1111dddd1000mmmm",
ThumbInstGen("111110101001nnnn1111dddd1011mmmm", // REVSH
[](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 m == n && d != 15 && m != 15;
}),
ThumbInstGen("111110101010nnnn1111dddd1000mmmm", // SEL
[](u32 inst) {
const auto d = Common::Bits<8, 11>(inst);
const auto m = Common::Bits<0, 3>(inst);