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shader: add FP64 min, max and rounding

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Co-authored-by: Çağatay Güçlü <33038942+defektu@users.noreply.github.com>
This commit is contained in:
nmzik
2026-10-04 23:08:09 +04:00
parent 96011cc5c9
commit 8274e517b2
9 changed files with 266 additions and 1 deletions
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterAlu.cpp
+30
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@@ -30,6 +30,28 @@ uint32_t CompareEqual64(EmitterState& state, uint32_t lhs_value, uint32_t rhs_va
return Unary(state, not_equal ? spv::OpAny : spv::OpAll, TypeBool(state), compare);
}
uint32_t EmitMinMaxF64(EmitterState& state, uint32_t lhs, uint32_t rhs, bool max_value) {
const auto bits_type = TypeU64(state);
const auto lhs_bits = Unary(state, spv::OpBitcast, bits_type, lhs);
const auto rhs_bits = Unary(state, spv::OpBitcast, bits_type, rhs);
const auto ordered = Binary(state, max_value ? spv::OpFOrdGreaterThan : spv::OpFOrdLessThan,
TypeBool(state), lhs, rhs);
auto result = Select(state, TypeF64(state), ordered, lhs, rhs);
// Equal values have identical bits except signed zero: min chooses -0, max chooses +0.
const auto equal = Binary(state, spv::OpFOrdEqual, TypeBool(state), lhs, rhs);
const auto equal_bits = Binary(state, max_value ? spv::OpBitwiseAnd : spv::OpBitwiseOr,
bits_type, lhs_bits, rhs_bits);
result = Select(state, TypeF64(state), equal,
Unary(state, spv::OpBitcast, TypeF64(state), equal_bits), result);
// Non-IEEE mode selects the other operand for NaN, including rhs when both are NaN.
result = Select(state, TypeF64(state), Unary(state, spv::OpIsNan, TypeBool(state), rhs),
lhs, result);
return Select(state, TypeF64(state), Unary(state, spv::OpIsNan, TypeBool(state), lhs),
rhs, result);
}
uint32_t CompareOrdered64(EmitterState& state, uint32_t lhs_value, uint32_t rhs_value,
spv::Op high_compare, spv::Op low_compare) {
const auto lhs = ExtractPair(state, lhs_value);
@@ -468,6 +490,14 @@ uint32_t EmitFPMax32(EmitterState& state, uint32_t arg0, uint32_t arg1) {
return EmitMinMaxF32Value(state, arg0, arg1, true);
}
uint32_t EmitFPMin64(EmitterState& state, uint32_t arg0, uint32_t arg1) {
return EmitMinMaxF64(state, arg0, arg1, false);
}
uint32_t EmitFPMax64(EmitterState& state, uint32_t arg0, uint32_t arg1) {
return EmitMinMaxF64(state, arg0, arg1, true);
}
uint32_t EmitFPMinTri32(EmitterState& state, uint32_t arg0, uint32_t arg1, uint32_t arg2) {
return EmitFMinMax3(state, arg0, arg1, arg2, false);
}