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glsl: Rework var alloc to not assign unused results

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This commit is contained in:
ameerj 2021-05-30 19:13:22 -04:00
parent 8185a5ab34
commit 33f63cdc22
9 changed files with 91 additions and 49 deletions
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9
src/shader_recompiler/backend/glsl/emit_glsl_atomic.cpp
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@ -11,8 +11,7 @@
namespace Shader::Backend::GLSL {
namespace {
static constexpr std::string_view cas_loop{R"({};
for (;;){{
static constexpr std::string_view cas_loop{R"(for (;;){{
uint old_value={};
{}=atomicCompSwap({},old_value,{}({},{}));
if ({}==old_value){{break;}}
@ -22,14 +21,14 @@ void SharedCasFunction(EmitContext& ctx, IR::Inst& inst, std::string_view offset
std::string_view value, std::string_view function) {
const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32)};
const std::string smem{fmt::format("smem[{}/4]", offset)};
ctx.Add(cas_loop.data(), ret, smem, ret, smem, function, smem, value, ret);
ctx.Add(cas_loop.data(), smem, ret, smem, function, smem, value, ret);
}
void SsboCasFunction(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
const IR::Value& offset, std::string_view value, std::string_view function) {
const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32)};
const std::string ssbo{fmt::format("ssbo{}[{}]", binding.U32(), offset.U32())};
ctx.Add(cas_loop.data(), ret, ssbo, ret, ssbo, function, ssbo, value, ret);
ctx.Add(cas_loop.data(), ssbo, ret, ssbo, function, ssbo, value, ret);
}
void SsboCasFunctionF32(EmitContext& ctx, IR::Inst& inst, const IR::Value& binding,
@ -37,7 +36,7 @@ void SsboCasFunctionF32(EmitContext& ctx, IR::Inst& inst, const IR::Value& bindi
std::string_view function) {
const std::string ssbo{fmt::format("ssbo{}[{}]", binding.U32(), offset.U32())};
const auto ret{ctx.var_alloc.Define(inst, GlslVarType::U32)};
ctx.Add(cas_loop.data(), ret, ssbo, ret, ssbo, function, ssbo, value, ret);
ctx.Add(cas_loop.data(), ssbo, ret, ssbo, function, ssbo, value, ret);
ctx.AddF32("{}=uintBitsToFloat({});", inst, ret);
}
} // namespace