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thumb32: Implement SMLSD{X}

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This commit is contained in:
Lioncash 2021-02-07 13:29:20 -05:00
parent ef3b77f8ae
commit 8a22bdff43
3 changed files with 29 additions and 1 deletions
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2
src/frontend/A32/decoder/thumb32.inc
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@ -271,7 +271,7 @@ INST(thumb32_SMLAD, "SMLAD", "111110110010nnnnaaaadd
//INST(thumb32_SMULWY, "SMULWY", "111110110011----1111----000-----")
//INST(thumb32_SMLAWY, "SMLAWY", "111110110011------------000-----")
INST(thumb32_SMUSD, "SMUSD", "111110110100nnnn1111dddd000Mmmmm")
//INST(thumb32_SMLSD, "SMLSD", "111110110100------------000-----")
INST(thumb32_SMLSD, "SMLSD", "111110110100nnnnaaaadddd000Xmmmm")
INST(thumb32_SMMUL, "SMMUL", "111110110101nnnn1111dddd000Rmmmm")
INST(thumb32_SMMLA, "SMMLA", "111110110101nnnnaaaadddd000Rmmmm")
INST(thumb32_SMMLS, "SMMLS", "111110110110nnnnaaaadddd000Rmmmm")

27
src/frontend/A32/translate/impl/thumb32_multiply.cpp
View file

@ -77,6 +77,33 @@ bool ThumbTranslatorVisitor::thumb32_SMLAD(Reg n, Reg a, Reg d, bool X, Reg m) {
return true;
}
bool ThumbTranslatorVisitor::thumb32_SMLSD(Reg n, Reg a, Reg d, bool X, Reg m) {
if (d == Reg::PC || n == Reg::PC || m == Reg::PC || a == 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 (X) {
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 addend = ir.GetRegister(a);
const IR::U32 product = ir.Sub(product_lo, product_hi);
auto result_overflow = ir.AddWithCarry(product, addend, ir.Imm1(0));
ir.SetRegister(d, result_overflow.result);
ir.OrQFlag(result_overflow.overflow);
return true;
}
bool ThumbTranslatorVisitor::thumb32_SMLAXY(Reg n, Reg a, Reg d, bool N, bool M, Reg m) {
if (d == Reg::PC || n == Reg::PC || m == Reg::PC || a == 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_SMLAD(Reg n, Reg a, Reg d, bool X, Reg m);
bool thumb32_SMLAXY(Reg n, Reg a, Reg d, bool N, bool M, Reg m);
bool thumb32_SMLSD(Reg n, Reg a, Reg d, bool X, Reg m);
bool thumb32_SMMLA(Reg n, Reg a, Reg d, bool R, Reg m);
bool thumb32_SMMLS(Reg n, Reg a, Reg d, bool R, Reg m);
bool thumb32_SMMUL(Reg n, Reg d, bool R, Reg m);