From 937990fd2a9991246ee00a0045fc88d3762f194b Mon Sep 17 00:00:00 2001 From: Lioncash Date: Tue, 3 Apr 2018 13:24:06 -0400 Subject: [PATCH] A64: Implement SHRN/SHRN2 --- src/frontend/A64/decoder/a64.inc | 2 +- .../impl/simd_shift_by_immediate.cpp | 23 +++++++++++++++++++ 2 files changed, 24 insertions(+), 1 deletion(-) diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc index 3c2bc28c..1992259d 100644 --- a/src/frontend/A64/decoder/a64.inc +++ b/src/frontend/A64/decoder/a64.inc @@ -795,7 +795,7 @@ INST(SSRA_2, "SSRA", "0Q001 //INST(SRSRA_2, "SRSRA", "0Q0011110IIIIiii001101nnnnnddddd") INST(SHL_2, "SHL", "0Q0011110IIIIiii010101nnnnnddddd") //INST(SQSHL_imm_2, "SQSHL (immediate)", "0Q0011110IIIIiii011101nnnnnddddd") -//INST(SHRN, "SHRN, SHRN2", "0Q0011110IIIIiii100001nnnnnddddd") +INST(SHRN, "SHRN, SHRN2", "0Q0011110IIIIiii100001nnnnnddddd") //INST(RSHRN, "RSHRN, RSHRN2", "0Q0011110IIIIiii100011nnnnnddddd") //INST(SQSHRN_2, "SQSHRN, SQSHRN2", "0Q0011110IIIIiii100101nnnnnddddd") //INST(SQRSHRN_2, "SQRSHRN, SQRSHRN2", "0Q0011110IIIIiii100111nnnnnddddd") diff --git a/src/frontend/A64/translate/impl/simd_shift_by_immediate.cpp b/src/frontend/A64/translate/impl/simd_shift_by_immediate.cpp index d91d1767..4e1fe051 100644 --- a/src/frontend/A64/translate/impl/simd_shift_by_immediate.cpp +++ b/src/frontend/A64/translate/impl/simd_shift_by_immediate.cpp @@ -68,6 +68,29 @@ bool TranslatorVisitor::SHL_2(bool Q, Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) return true; } +bool TranslatorVisitor::SHRN(bool Q, Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) { + if (immh == 0b0000) { + return DecodeError(); + } + + if (immh.Bit<3>()) { + return ReservedValue(); + } + + const size_t esize = 8 << Common::HighestSetBit(immh.ZeroExtend()); + const size_t source_esize = 2 * esize; + const size_t part = Q ? 1 : 0; + + const u8 shift_amount = static_cast(source_esize - concatenate(immh, immb).ZeroExtend()); + + const IR::U128 operand = ir.GetQ(Vn); + const IR::U128 result = ir.VectorNarrow(source_esize, + ir.VectorLogicalShiftRight(source_esize, operand, shift_amount)); + + Vpart(64, Vd, part, result); + return true; +} + bool TranslatorVisitor::SSHLL(bool Q, Imm<4> immh, Imm<3> immb, Vec Vn, Vec Vd) { if (immh == 0b0000) { return DecodeError();