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Diffstat (limited to '')
-rw-r--r-- | src/shader_recompiler/frontend/maxwell/translate/impl/integer_to_integer_conversion.cpp | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/integer_to_integer_conversion.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/integer_to_integer_conversion.cpp new file mode 100644 index 000000000..53e8d8923 --- /dev/null +++ b/src/shader_recompiler/frontend/maxwell/translate/impl/integer_to_integer_conversion.cpp @@ -0,0 +1,126 @@ +// 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 { +enum class IntegerWidth : u64 { + Byte, + Short, + Word, +}; + +[[nodiscard]] IR::U32 WidthSize(IR::IREmitter& ir, IntegerWidth width) { + switch (width) { + case IntegerWidth::Byte: + return ir.Imm32(8); + case IntegerWidth::Short: + return ir.Imm32(16); + case IntegerWidth::Word: + return ir.Imm32(32); + default: + throw NotImplementedException("Invalid width {}", width); + } +} + +[[nodiscard]] IR::U32 ConvertInteger(IR::IREmitter& ir, const IR::U32& src, + IntegerWidth dst_width) { + const IR::U32 zero{ir.Imm32(0)}; + const IR::U32 count{WidthSize(ir, dst_width)}; + return ir.BitFieldExtract(src, zero, count, false); +} + +[[nodiscard]] IR::U32 SaturateInteger(IR::IREmitter& ir, const IR::U32& src, IntegerWidth dst_width, + bool dst_signed, bool src_signed) { + IR::U32 min{}; + IR::U32 max{}; + const IR::U32 zero{ir.Imm32(0)}; + switch (dst_width) { + case IntegerWidth::Byte: + min = dst_signed && src_signed ? ir.Imm32(0xffffff80) : zero; + max = dst_signed ? ir.Imm32(0x7f) : ir.Imm32(0xff); + break; + case IntegerWidth::Short: + min = dst_signed && src_signed ? ir.Imm32(0xffff8000) : zero; + max = dst_signed ? ir.Imm32(0x7fff) : ir.Imm32(0xffff); + break; + case IntegerWidth::Word: + min = dst_signed && src_signed ? ir.Imm32(0x80000000) : zero; + max = dst_signed ? ir.Imm32(0x7fffffff) : ir.Imm32(0xffffffff); + break; + default: + throw NotImplementedException("Invalid width {}", dst_width); + } + const IR::U32 value{!dst_signed && src_signed ? ir.SMax(zero, src) : src}; + return dst_signed && src_signed ? ir.SClamp(value, min, max) : ir.UClamp(value, min, max); +} + +void I2I(TranslatorVisitor& v, u64 insn, const IR::U32& src_a) { + union { + u64 insn; + BitField<0, 8, IR::Reg> dest_reg; + BitField<8, 2, IntegerWidth> dst_fmt; + BitField<12, 1, u64> dst_fmt_sign; + BitField<10, 2, IntegerWidth> src_fmt; + BitField<13, 1, u64> src_fmt_sign; + BitField<41, 3, u64> selector; + BitField<45, 1, u64> neg; + BitField<47, 1, u64> cc; + BitField<49, 1, u64> abs; + BitField<50, 1, u64> sat; + } const i2i{insn}; + + if (i2i.src_fmt == IntegerWidth::Short && (i2i.selector == 1 || i2i.selector == 3)) { + throw NotImplementedException("16-bit source format incompatible with selector {}", + i2i.selector); + } + if (i2i.src_fmt == IntegerWidth::Word && i2i.selector != 0) { + throw NotImplementedException("32-bit source format incompatible with selector {}", + i2i.selector); + } + + const s32 selector{static_cast<s32>(i2i.selector)}; + const IR::U32 offset{v.ir.Imm32(selector * 8)}; + const IR::U32 count{WidthSize(v.ir, i2i.src_fmt)}; + const bool src_signed{i2i.src_fmt_sign != 0}; + const bool dst_signed{i2i.dst_fmt_sign != 0}; + const bool sat{i2i.sat != 0}; + + IR::U32 src_values{v.ir.BitFieldExtract(src_a, offset, count, src_signed)}; + if (i2i.abs != 0) { + src_values = v.ir.IAbs(src_values); + } + if (i2i.neg != 0) { + src_values = v.ir.INeg(src_values); + } + const IR::U32 result{ + sat ? SaturateInteger(v.ir, src_values, i2i.dst_fmt, dst_signed, src_signed) + : ConvertInteger(v.ir, src_values, i2i.dst_fmt)}; + + v.X(i2i.dest_reg, result); + if (i2i.cc != 0) { + v.SetZFlag(v.ir.GetZeroFromOp(result)); + v.SetSFlag(v.ir.GetSignFromOp(result)); + v.ResetCFlag(); + v.ResetOFlag(); + } +} +} // Anonymous namespace + +void TranslatorVisitor::I2I_reg(u64 insn) { + I2I(*this, insn, GetReg20(insn)); +} + +void TranslatorVisitor::I2I_cbuf(u64 insn) { + I2I(*this, insn, GetCbuf(insn)); +} + +void TranslatorVisitor::I2I_imm(u64 insn) { + I2I(*this, insn, GetImm20(insn)); +} + +} // namespace Shader::Maxwell |