From 4d9a7308ac0b5a883b7f9451b3c78fd00bfd1d0a Mon Sep 17 00:00:00 2001 From: Lioncash Date: Sun, 7 Feb 2021 13:04:18 -0500 Subject: [PATCH] thumb32: Implement SMUAD --- src/frontend/A32/decoder/thumb32.inc | 2 +- .../A32/translate/impl/thumb32_multiply.cpp | 25 +++++++++++++++++++ .../A32/translate/impl/translate_thumb.h | 1 + 3 files changed, 27 insertions(+), 1 deletion(-) diff --git a/src/frontend/A32/decoder/thumb32.inc b/src/frontend/A32/decoder/thumb32.inc index 1dfb48c5..f08efe2d 100644 --- a/src/frontend/A32/decoder/thumb32.inc +++ b/src/frontend/A32/decoder/thumb32.inc @@ -266,7 +266,7 @@ INST(thumb32_MLA, "MLA", "111110110000nnnnaaaadd INST(thumb32_MLS, "MLS", "111110110000nnnnaaaadddd0001mmmm") INST(thumb32_SMULXY, "SMULXY", "111110110001nnnn1111dddd00NMmmmm") INST(thumb32_SMLAXY, "SMLAXY", "111110110001nnnnaaaadddd00NMmmmm") -//INST(thumb32_SMUAD, "SMUAD", "111110110010----1111----000-----") +INST(thumb32_SMUAD, "SMUAD", "111110110010nnnn1111dddd000Mmmmm") //INST(thumb32_SMLAD, "SMLAD", "111110110010------------000-----") //INST(thumb32_SMULWY, "SMULWY", "111110110011----1111----000-----") //INST(thumb32_SMLAWY, "SMLAWY", "111110110011------------000-----") diff --git a/src/frontend/A32/translate/impl/thumb32_multiply.cpp b/src/frontend/A32/translate/impl/thumb32_multiply.cpp index e34c5780..e8a383c8 100644 --- a/src/frontend/A32/translate/impl/thumb32_multiply.cpp +++ b/src/frontend/A32/translate/impl/thumb32_multiply.cpp @@ -67,6 +67,31 @@ bool ThumbTranslatorVisitor::thumb32_SMLAXY(Reg n, Reg a, Reg d, bool N, bool M, return true; } +bool ThumbTranslatorVisitor::thumb32_SMUAD(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 auto result_overflow = ir.AddWithCarry(product_lo, product_hi, ir.Imm1(0)); + + ir.SetRegister(d, result_overflow.result); + ir.OrQFlag(result_overflow.overflow); + 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(); diff --git a/src/frontend/A32/translate/impl/translate_thumb.h b/src/frontend/A32/translate/impl/translate_thumb.h index 86fce434..18c178c4 100644 --- a/src/frontend/A32/translate/impl/translate_thumb.h +++ b/src/frontend/A32/translate/impl/translate_thumb.h @@ -133,6 +133,7 @@ struct ThumbTranslatorVisitor final { bool thumb32_MLS(Reg n, Reg a, Reg d, Reg m); 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_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);