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Implement thumb16_{SXTH,SXTB,UXTH,UXTB,REV,REV16,REVSH}

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MerryMage
2016-07-16 19:23:42 +01:00
parent 866dce0f23
commit 3720da4e19
8 changed files with 194 additions and 8 deletions
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62
src/frontend/translate/translate_thumb.cpp
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@@ -440,6 +440,68 @@ struct ThumbTranslatorVisitor final {
return true;
}
bool thumb16_SXTH(Reg m, Reg d) {
// SXTH <Rd>, <Rm>
// Rd cannot encode R15.
auto half = ir.LeastSignificantHalf(ir.GetRegister(m));
ir.SetRegister(d, ir.SignExtendHalfToWord(half));
return true;
}
bool thumb16_SXTB(Reg m, Reg d) {
// SXTB <Rd>, <Rm>
// Rd cannot encode R15.
auto byte = ir.LeastSignificantByte(ir.GetRegister(m));
ir.SetRegister(d, ir.SignExtendByteToWord(byte));
return true;
}
bool thumb16_UXTH(Reg m, Reg d) {
// UXTH <Rd>, <Rm>
// Rd cannot encode R15.
auto half = ir.LeastSignificantHalf(ir.GetRegister(m));
ir.SetRegister(d, ir.ZeroExtendHalfToWord(half));
return true;
}
bool thumb16_UXTB(Reg m, Reg d) {
// UXTB <Rd>, <Rm>
// Rd cannot encode R15.
auto byte = ir.LeastSignificantByte(ir.GetRegister(m));
ir.SetRegister(d, ir.ZeroExtendByteToWord(byte));
return true;
}
bool thumb16_REV(Reg m, Reg d) {
// REV <Rd>, <Rm>
// Rd cannot encode R15.
ir.SetRegister(d, ir.ByteReverseWord(ir.GetRegister(m)));
return true;
}
bool thumb16_REV16(Reg m, Reg d) {
// REV16 <Rd>, <Rm>
// Rd cannot encode R15.
// TODO: Consider optimizing
auto Rm = ir.GetRegister(m);
auto upper_half = ir.LeastSignificantHalf(ir.LogicalShiftRight(Rm, ir.Imm8(16), ir.Imm1(0)).result);
auto lower_half = ir.LeastSignificantHalf(Rm);
auto rev_upper_half = ir.ZeroExtendHalfToWord(ir.ByteReverseHalf(upper_half));
auto rev_lower_half = ir.ZeroExtendHalfToWord(ir.ByteReverseHalf(lower_half));
auto result = ir.Or(ir.LogicalShiftLeft(rev_upper_half, ir.Imm8(16), ir.Imm1(0)).result,
rev_lower_half);
ir.SetRegister(d, result);
return true;
}
bool thumb16_REVSH(Reg m, Reg d) {
// REVSH <Rd>, <Rm>
// Rd cannot encode R15.
auto rev_half = ir.ByteReverseHalf(ir.LeastSignificantHalf(ir.GetRegister(m)));
ir.SetRegister(d, ir.SignExtendHalfToWord(rev_half));
return true;
}
bool thumb16_UDF() {
return InterpretThisInstruction();
}