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thumb32: Implement SSUB8/USUB8

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This commit is contained in:
Lioncash 2021-02-01 16:47:12 -05:00
parent 271354ee95
commit 6f593da41b
4 changed files with 36 additions and 2 deletions
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4
src/frontend/A32/decoder/thumb32.h
View file

@ -240,7 +240,7 @@ std::optional<std::reference_wrapper<const Thumb32Matcher<V>>> DecodeThumb32(u32
INST(&V::thumb32_SSAX, "SSAX", "111110101110nnnn1111dddd0000mmmm"),
INST(&V::thumb32_SSUB16, "SSUB16", "111110101101nnnn1111dddd0000mmmm"),
INST(&V::thumb32_SADD8, "SADD8", "111110101000nnnn1111dddd0000mmmm"),
//INST(&V::thumb32_SSUB8, "SSUB8", "111110101100----1111----0000----"),
INST(&V::thumb32_SSUB8, "SSUB8", "111110101100nnnn1111dddd0000mmmm"),
//INST(&V::thumb32_QADD16, "QADD16", "111110101001----1111----0001----"),
//INST(&V::thumb32_QASX, "QASX", "111110101010----1111----0001----"),
//INST(&V::thumb32_QSAX, "QSAX", "111110101110----1111----0001----"),
@ -260,7 +260,7 @@ std::optional<std::reference_wrapper<const Thumb32Matcher<V>>> DecodeThumb32(u32
INST(&V::thumb32_USAX, "USAX", "111110101110nnnn1111dddd0100mmmm"),
INST(&V::thumb32_USUB16, "USUB16", "111110101101nnnn1111dddd0100mmmm"),
INST(&V::thumb32_UADD8, "UADD8", "111110101000nnnn1111dddd0100mmmm"),
//INST(&V::thumb32_USUB8, "USUB8", "111110101100----1111----0100----"),
INST(&V::thumb32_USUB8, "USUB8", "111110101100nnnn1111dddd0100mmmm"),
//INST(&V::thumb32_UQADD16, "UQADD16", "111110101001----1111----0101----"),
//INST(&V::thumb32_UQASX, "UQASX", "111110101010----1111----0101----"),
//INST(&V::thumb32_UQSAX, "UQSAX", "111110101110----1111----0101----"),

28
src/frontend/A32/translate/impl/thumb32_parallel.cpp
View file

@ -63,6 +63,20 @@ bool ThumbTranslatorVisitor::thumb32_SSAX(Reg n, Reg d, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_SSUB8(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.PackedSubS8(reg_n, reg_m);
ir.SetRegister(d, result.result);
ir.SetGEFlags(result.ge);
return true;
}
bool ThumbTranslatorVisitor::thumb32_SSUB16(Reg n, Reg d, Reg m) {
if (d == Reg::PC || n == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();
@ -133,6 +147,20 @@ bool ThumbTranslatorVisitor::thumb32_USAX(Reg n, Reg d, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_USUB8(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.PackedSubU8(reg_n, reg_m);
ir.SetRegister(d, result.result);
ir.SetGEFlags(result.ge);
return true;
}
bool ThumbTranslatorVisitor::thumb32_USUB16(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
View file

@ -133,11 +133,13 @@ struct ThumbTranslatorVisitor final {
bool thumb32_SADD16(Reg n, Reg d, Reg m);
bool thumb32_SASX(Reg n, Reg d, Reg m);
bool thumb32_SSAX(Reg n, Reg d, Reg m);
bool thumb32_SSUB8(Reg n, Reg d, Reg m);
bool thumb32_SSUB16(Reg n, Reg d, Reg m);
bool thumb32_UADD8(Reg n, Reg d, Reg m);
bool thumb32_UADD16(Reg n, Reg d, Reg m);
bool thumb32_UASX(Reg n, Reg d, Reg m);
bool thumb32_USAX(Reg n, Reg d, Reg m);
bool thumb32_USUB8(Reg n, Reg d, Reg m);
bool thumb32_USUB16(Reg n, Reg d, Reg m);
};

4
tests/A32/fuzz_thumb.cpp
View file

@ -422,6 +422,8 @@ TEST_CASE("Fuzz Thumb32 instructions set", "[JitX64][Thumb][Thumb32]") {
three_reg_not_r15),
ThumbInstGen("111110101110nnnn1111dddd0000mmmm", // SSAX
three_reg_not_r15),
ThumbInstGen("111110101100nnnn1111dddd0000mmmm", // SSUB8
three_reg_not_r15),
ThumbInstGen("111110101101nnnn1111dddd0000mmmm", // SSUB16
three_reg_not_r15),
ThumbInstGen("111110101000nnnn1111dddd0100mmmm", // UADD8
@ -432,6 +434,8 @@ TEST_CASE("Fuzz Thumb32 instructions set", "[JitX64][Thumb][Thumb32]") {
three_reg_not_r15),
ThumbInstGen("111110101110nnnn1111dddd0100mmmm", // USAX
three_reg_not_r15),
ThumbInstGen("111110101100nnnn1111dddd0100mmmm", // USUB8
three_reg_not_r15),
ThumbInstGen("111110101101nnnn1111dddd0100mmmm", // USUB16
three_reg_not_r15),
};