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thumb32: Implement REV16

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This commit is contained in:
Lioncash 2021-02-01 15:24:12 -05:00
parent cee31c5274
commit 0304dc7ce4
4 changed files with 23 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.h
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@ -280,7 +280,7 @@ std::optional<std::reference_wrapper<const Thumb32Matcher<V>>> DecodeThumb32(u32
//INST(&V::thumb32_QSUB, "QSUB", "111110101000----1111----1010----"),
//INST(&V::thumb32_QDSUB, "QDSUB", "111110101000----1111----1011----"),
//INST(&V::thumb32_REV, "REV", "111110101001----1111----1000----"),
//INST(&V::thumb32_REV16, "REV16", "111110101001----1111----1001----"),
INST(&V::thumb32_REV16, "REV16", "111110101001nnnn1111dddd1001mmmm"),
INST(&V::thumb32_RBIT, "RBIT", "111110101001nnnn1111dddd1010mmmm"),
INST(&V::thumb32_REVSH, "REVSH", "111110101001nnnn1111dddd1011mmmm"),
INST(&V::thumb32_SEL, "SEL", "111110101010nnnn1111dddd1000mmmm"),

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

@ -44,6 +44,20 @@ bool ThumbTranslatorVisitor::thumb32_RBIT(Reg n, Reg d, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_REV16(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 lo = ir.And(ir.LogicalShiftRight(reg_m, ir.Imm8(8), ir.Imm1(0)).result, ir.Imm32(0x00FF00FF));
const auto hi = ir.And(ir.LogicalShiftLeft(reg_m, ir.Imm8(8), ir.Imm1(0)).result, ir.Imm32(0xFF00FF00));
const auto result = ir.Or(lo, hi);
ir.SetRegister(d, result);
return true;
}
bool ThumbTranslatorVisitor::thumb32_REVSH(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

@ -119,6 +119,7 @@ struct ThumbTranslatorVisitor final {
// thumb32 miscellaneous instructions
bool thumb32_CLZ(Reg n, Reg d, Reg m);
bool thumb32_RBIT(Reg n, Reg d, Reg m);
bool thumb32_REV16(Reg n, Reg d, Reg m);
bool thumb32_REVSH(Reg n, Reg d, Reg m);
bool thumb32_SEL(Reg n, Reg d, Reg m);
};