From 34ac9b4d7e71198503d7fca88c0494e1f97701e7 Mon Sep 17 00:00:00 2001 From: ameerj <52414509+ameerj@users.noreply.github.com> Date: Sat, 27 Feb 2021 01:45:13 -0500 Subject: [PATCH] shader: Implement BFE --- src/shader_recompiler/CMakeLists.txt | 1 + .../translate/impl/bitfield_extract.cpp | 66 +++++++++++++++++++ .../translate/impl/not_implemented.cpp | 12 ---- 3 files changed, 67 insertions(+), 12 deletions(-) create mode 100644 src/shader_recompiler/frontend/maxwell/translate/impl/bitfield_extract.cpp diff --git a/src/shader_recompiler/CMakeLists.txt b/src/shader_recompiler/CMakeLists.txt index b4d2dcc42..8be2d353f 100644 --- a/src/shader_recompiler/CMakeLists.txt +++ b/src/shader_recompiler/CMakeLists.txt @@ -59,6 +59,7 @@ add_library(shader_recompiler STATIC frontend/maxwell/opcodes.h frontend/maxwell/program.cpp frontend/maxwell/program.h + frontend/maxwell/translate/impl/bitfield_extract.cpp frontend/maxwell/translate/impl/common_encoding.h frontend/maxwell/translate/impl/floating_point_add.cpp frontend/maxwell/translate/impl/floating_point_conversion_integer.cpp diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/bitfield_extract.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/bitfield_extract.cpp new file mode 100644 index 000000000..4a03e6939 --- /dev/null +++ b/src/shader_recompiler/frontend/maxwell/translate/impl/bitfield_extract.cpp @@ -0,0 +1,66 @@ +// Copyright 2021 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include "common/bit_field.h" +#include "common/common_types.h" +#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h" + +namespace Shader::Maxwell { +namespace { +void BFE(TranslatorVisitor& v, u64 insn, const IR::U32& src) { + union { + u64 insn; + BitField<0, 8, IR::Reg> dest_reg; + BitField<8, 8, IR::Reg> offset_reg; + BitField<40, 1, u64> brev; + BitField<48, 1, u64> is_signed; + } const bfe{insn}; + + const IR::U32 offset{v.ir.BitFieldExtract(src, v.ir.Imm32(0), v.ir.Imm32(8), false)}; + const IR::U32 count{v.ir.BitFieldExtract(src, v.ir.Imm32(8), v.ir.Imm32(8), false)}; + + // Common constants + const IR::U32 zero{v.ir.Imm32(0)}; + const IR::U32 one{v.ir.Imm32(1)}; + const IR::U32 max_size{v.ir.Imm32(32)}; + // Edge case conditions + const IR::U1 zero_count{v.ir.IEqual(count, zero)}; + const IR::U1 exceed_count{v.ir.IGreaterThanEqual(v.ir.IAdd(offset, count), max_size, false)}; + const IR::U1 replicate{v.ir.IGreaterThanEqual(offset, max_size, false)}; + + IR::U32 base{v.X(bfe.offset_reg)}; + if (bfe.brev != 0) { + base = v.ir.BitReverse(base); + } + IR::U32 result{v.ir.BitFieldExtract(base, offset, count, bfe.is_signed != 0)}; + if (bfe.is_signed != 0) { + const IR::U1 is_negative{v.ir.ILessThan(base, zero, true)}; + const IR::U32 replicated_bit{v.ir.Select(is_negative, v.ir.Imm32(-1), zero)}; + const IR::U32 exceed_bit{v.ir.BitFieldExtract(base, v.ir.Imm32(31), one, false)}; + // Replicate condition + result = IR::U32{v.ir.Select(replicate, replicated_bit, result)}; + // Exceeding condition + const IR::U32 exceed_result{v.ir.BitFieldInsert(result, exceed_bit, v.ir.Imm32(31), one)}; + result = IR::U32{v.ir.Select(exceed_count, exceed_result, result)}; + } + // Zero count condition + result = IR::U32{v.ir.Select(zero_count, zero, result)}; + + v.X(bfe.dest_reg, result); +} +} // Anonymous namespace + +void TranslatorVisitor::BFE_reg(u64 insn) { + BFE(*this, insn, GetReg20(insn)); +} + +void TranslatorVisitor::BFE_cbuf(u64 insn) { + BFE(*this, insn, GetCbuf(insn)); +} + +void TranslatorVisitor::BFE_imm(u64 insn) { + BFE(*this, insn, GetImm20(insn)); +} + +} // namespace Shader::Maxwell diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp index 127686b43..3714f5f4f 100644 --- a/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp +++ b/src/shader_recompiler/frontend/maxwell/translate/impl/not_implemented.cpp @@ -49,18 +49,6 @@ void TranslatorVisitor::BAR(u64) { ThrowNotImplemented(Opcode::BAR); } -void TranslatorVisitor::BFE_reg(u64) { - ThrowNotImplemented(Opcode::BFE_reg); -} - -void TranslatorVisitor::BFE_cbuf(u64) { - ThrowNotImplemented(Opcode::BFE_cbuf); -} - -void TranslatorVisitor::BFE_imm(u64) { - ThrowNotImplemented(Opcode::BFE_imm); -} - void TranslatorVisitor::BFI_reg(u64) { ThrowNotImplemented(Opcode::BFI_reg); }