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thumb32: Implement SMUSD

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This commit is contained in:
Lioncash 2021-02-07 13:07:07 -05:00
parent 4d9a7308ac
commit 44f4f437a7
3 changed files with 26 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.inc
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@ -270,7 +270,7 @@ INST(thumb32_SMUAD, "SMUAD", "111110110010nnnn1111dd
//INST(thumb32_SMLAD, "SMLAD", "111110110010------------000-----")
//INST(thumb32_SMULWY, "SMULWY", "111110110011----1111----000-----")
//INST(thumb32_SMLAWY, "SMLAWY", "111110110011------------000-----")
//INST(thumb32_SMUSD, "SMUSD", "111110110100----1111----000-----")
INST(thumb32_SMUSD, "SMUSD", "111110110100nnnn1111dddd000Mmmmm")
//INST(thumb32_SMLSD, "SMLSD", "111110110100------------000-----")
//INST(thumb32_SMMUL, "SMMUL", "111110110101----1111----000-----")
//INST(thumb32_SMMLA, "SMMLA", "111110110101------------000-----")

24
src/frontend/A32/translate/impl/thumb32_multiply.cpp
View file

@ -92,6 +92,30 @@ bool ThumbTranslatorVisitor::thumb32_SMUAD(Reg n, Reg d, bool M, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_SMUSD(Reg n, Reg d, bool M, Reg m) {
if (d == Reg::PC || n == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();
}
const IR::U32 n32 = ir.GetRegister(n);
const IR::U32 m32 = ir.GetRegister(m);
const IR::U32 n_lo = ir.SignExtendHalfToWord(ir.LeastSignificantHalf(n32));
const IR::U32 n_hi = ir.ArithmeticShiftRight(n32, ir.Imm8(16), ir.Imm1(0)).result;
IR::U32 m_lo = ir.SignExtendHalfToWord(ir.LeastSignificantHalf(m32));
IR::U32 m_hi = ir.ArithmeticShiftRight(m32, ir.Imm8(16), ir.Imm1(0)).result;
if (M) {
std::swap(m_lo, m_hi);
}
const IR::U32 product_lo = ir.Mul(n_lo, m_lo);
const IR::U32 product_hi = ir.Mul(n_hi, m_hi);
const IR::U32 result = ir.Sub(product_lo, product_hi);
ir.SetRegister(d, result);
return true;
}
bool ThumbTranslatorVisitor::thumb32_SMULXY(Reg n, Reg d, bool N, bool M, Reg m) {
if (d == Reg::PC || n == Reg::PC || m == Reg::PC) {
return UnpredictableInstruction();

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

@ -134,6 +134,7 @@ struct ThumbTranslatorVisitor final {
bool thumb32_MUL(Reg n, Reg d, Reg m);
bool thumb32_SMLAXY(Reg n, Reg a, Reg d, bool N, bool M, Reg m);
bool thumb32_SMUAD(Reg n, Reg d, bool M, Reg m);
bool thumb32_SMUSD(Reg n, Reg d, bool M, Reg m);
bool thumb32_SMULXY(Reg n, Reg d, bool N, bool M, Reg m);
bool thumb32_USAD8(Reg n, Reg d, Reg m);
bool thumb32_USADA8(Reg n, Reg a, Reg d, Reg m);