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MarcusandClaude Opus 5.5
5377db48fd
VOP3 0x140 is v_mad_legacy_f32 on gfx10.1. Measured on gfx1010 (RX 5700 XT) in wave32 and wave64, IEEE 0 and 1 and f32 denormal modes 0 to 3, it rounds the product before the add, flushes f32 denormal sources, product and result in every mode, and gives a +0 product for a zero factor. The translation multiplies, applies the zero rule and flushTinyProduct, adds, and keeps the nanResultF32 wrapper. f32DenormalFlushFor returns 3 for the instruction before reading FLOAT_MODE. A sum of two zeros takes its sign on the bits, as lavapipe returned -0 for +0 + -0. The execution test pins the measured results and compares NaN bits exactly. RDNA2 (gfx1031), where the encoding is v_fma_legacy_f32 and fused, is noted in TechnicalDebt. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
27 lines
1.1 KiB
C++
27 lines
1.1 KiB
C++
#include "Translation/TranslationContext.hpp"
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#include "RdnaDecoder/RdnaVectorOpDecoder.hpp"
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#include <array>
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#include <stdexcept>
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using namespace ShaderRecompiler;
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static void Require(bool value) { if (!value) throw std::runtime_error("vector legacy mad regression"); }
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static void Check(std::uint32_t encoding, RdnaOpcode opcode, IrOpcode expected) {
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const std::array<std::uint32_t, 2> code{(encoding << 16u) | 1u, 1u | (2u << 9u) | (3u << 18u)};
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const RdnaInstruction instruction = DecodeRdnaVop3(0u, code, 0u);
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Require(instruction.op == opcode);
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Require(instruction.family == RdnaInstructionFamily::VOP3);
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Require(IsVectorAluOpcode(instruction.op));
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IrProgram program;
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auto& block = program.CreateBlock();
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program.SetEntryBlock(block);
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TranslationContext context(program, block, 256);
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context.TranslateInstruction(instruction);
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bool found = false;
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for (auto* value : block.Instructions()) found = found || value->Opcode() == expected;
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Require(found);
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}
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int main() {
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Check(0x140u, RdnaOpcode::VMadLegacyF32, IrOpcode::FPMul32);
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Check(0x150u, RdnaOpcode::VMullitF32, IrOpcode::FPMul32);
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}
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