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thumb32: Implement SHSUB8/UHSUB8

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This commit is contained in:
Lioncash
2021-02-01 17:25:56 -05:00
parent 9d2570470e
commit 23619c8c6a
4 changed files with 34 additions and 2 deletions
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4
src/frontend/A32/decoder/thumb32.h
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@@ -252,7 +252,7 @@ std::optional<std::reference_wrapper<const Thumb32Matcher<V>>> DecodeThumb32(u32
INST(&V::thumb32_SHSAX, "SHSAX", "111110101110nnnn1111dddd0010mmmm"),
INST(&V::thumb32_SHSUB16, "SHSUB16", "111110101101nnnn1111dddd0010mmmm"),
INST(&V::thumb32_SHADD8, "SHADD8", "111110101000nnnn1111dddd0010mmmm"),
//INST(&V::thumb32_SHSUB8, "SHSUB8", "111110101100----1111----0010----"),
INST(&V::thumb32_SHSUB8, "SHSUB8", "111110101100nnnn1111dddd0010mmmm"),
// Parallel Addition and Subtraction (unsigned)
INST(&V::thumb32_UADD16, "UADD16", "111110101001nnnn1111dddd0100mmmm"),
@@ -272,7 +272,7 @@ std::optional<std::reference_wrapper<const Thumb32Matcher<V>>> DecodeThumb32(u32
INST(&V::thumb32_UHSAX, "UHSAX", "111110101110nnnn1111dddd0110mmmm"),
INST(&V::thumb32_UHSUB16, "UHSUB16", "111110101101nnnn1111dddd0110mmmm"),
INST(&V::thumb32_UHADD8, "UHADD8", "111110101000nnnn1111dddd0110mmmm"),
//INST(&V::thumb32_UHSUB8, "UHSUB8", "111110101100----1111----0110----"),
INST(&V::thumb32_UHSUB8, "UHSUB8", "111110101100nnnn1111dddd0110mmmm"),
// Miscellaneous Operations
INST(&V::thumb32_QADD, "QADD", "111110101000nnnn1111dddd1000mmmm"),

26
src/frontend/A32/translate/impl/thumb32_parallel.cpp
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@@ -414,6 +414,19 @@ bool ThumbTranslatorVisitor::thumb32_SHSAX(Reg n, Reg d, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_SHSUB8(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.PackedHalvingSubS8(reg_n, reg_m);
ir.SetRegister(d, result);
return true;
}
bool ThumbTranslatorVisitor::thumb32_SHSUB16(Reg n, Reg d, Reg m) {
if (d == Reg::PC || n == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();
@@ -479,6 +492,19 @@ bool ThumbTranslatorVisitor::thumb32_UHSAX(Reg n, Reg d, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_UHSUB8(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.PackedHalvingSubU8(reg_n, reg_m);
ir.SetRegister(d, result);
return true;
}
bool ThumbTranslatorVisitor::thumb32_UHSUB16(Reg n, Reg d, Reg m) {
if (d == Reg::PC || n == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();

2
src/frontend/A32/translate/impl/translate_thumb.h
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@@ -159,11 +159,13 @@ struct ThumbTranslatorVisitor final {
bool thumb32_SHADD16(Reg n, Reg d, Reg m);
bool thumb32_SHASX(Reg n, Reg d, Reg m);
bool thumb32_SHSAX(Reg n, Reg d, Reg m);
bool thumb32_SHSUB8(Reg n, Reg d, Reg m);
bool thumb32_SHSUB16(Reg n, Reg d, Reg m);
bool thumb32_UHADD8(Reg n, Reg d, Reg m);
bool thumb32_UHADD16(Reg n, Reg d, Reg m);
bool thumb32_UHASX(Reg n, Reg d, Reg m);
bool thumb32_UHSAX(Reg n, Reg d, Reg m);
bool thumb32_UHSUB8(Reg n, Reg d, Reg m);
bool thumb32_UHSUB16(Reg n, Reg d, Reg m);
};