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thumb32: Implement SXTB16

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This commit is contained in:
Lioncash 2021-02-10 16:11:09 -05:00
parent 39a75472e2
commit 1b5fcfd8d1
3 changed files with 16 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.inc
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@ -199,7 +199,7 @@ INST(thumb32_SXTH, "SXTH", "11111010000011111111dd
INST(thumb32_SXTAH, "SXTAH", "111110100000nnnn1111dddd10rrmmmm")
INST(thumb32_UXTH, "UXTH", "11111010000111111111dddd10rrmmmm")
INST(thumb32_UXTAH, "UXTAH", "111110100001nnnn1111dddd10rrmmmm")
//INST(thumb32_SXTB16, "SXTB16", "11111010001011111111----1-------")
INST(thumb32_SXTB16, "SXTB16", "11111010001011111111dddd10rrmmmm")
//INST(thumb32_SXTAB16, "SXTAB16", "111110100010----1111----1-------")
//INST(thumb32_UXTB16, "UXTB16", "11111010001111111111----1-------")
//INST(thumb32_UXTAB16, "UXTAB16", "111110100011----1111----1-------")

14
src/frontend/A32/translate/impl/thumb32_data_processing_register.cpp
View file

@ -11,6 +11,20 @@ static IR::U32 Rotate(A32::IREmitter& ir, Reg m, SignExtendRotation rotate) {
return ir.RotateRight(ir.GetRegister(m), ir.Imm8(rotate_by), ir.Imm1(0)).result;
}
bool ThumbTranslatorVisitor::thumb32_SXTB16(Reg d, SignExtendRotation rotate, Reg m) {
if (d == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();
}
const auto rotated = Rotate(ir, m, rotate);
const auto low_byte = ir.And(rotated, ir.Imm32(0x00FF00FF));
const auto sign_bit = ir.And(rotated, ir.Imm32(0x00800080));
const auto result = ir.Or(low_byte, ir.Mul(sign_bit, ir.Imm32(0x1FE)));
ir.SetRegister(d, result);
return true;
}
bool ThumbTranslatorVisitor::thumb32_SXTH(Reg d, SignExtendRotation rotate, Reg m) {
if (d == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();

1
src/frontend/A32/translate/impl/translate_thumb.h
View file

@ -122,6 +122,7 @@ struct ThumbTranslatorVisitor final {
bool thumb32_UDF();
// thumb32 data processing (register) instructions
bool thumb32_SXTB16(Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_SXTH(Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_SXTAH(Reg n, Reg d, SignExtendRotation rotate, Reg m);
bool thumb32_UXTH(Reg d, SignExtendRotation rotate, Reg m);