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vkd3d-shader/hlsl: Implement constant folding of 'mad' expressions.

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As encountered in tests/hlsl/trigonometry.shader_test.
This commit is contained in:
Henri Verbeet
2025-09-03 14:23:28 +02:00
parent 7f4a186e6a
commit d7a05d823c
Notes: Henri Verbeet 2025-09-09 15:10:32 +02:00 
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1716
1 changed files with 42 additions and 0 deletions
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42
libs/vkd3d-shader/hlsl_constant_ops.c
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@@ -974,6 +974,44 @@ static bool fold_lshift(struct hlsl_ctx *ctx, struct hlsl_constant_value *dst, c
return true;
}
static bool fold_mad(struct hlsl_ctx *ctx, struct hlsl_constant_value *dst, const struct hlsl_type *dst_type,
const struct hlsl_ir_constant *src1, const struct hlsl_ir_constant *src2, const struct hlsl_ir_constant *src3)
{
enum hlsl_base_type type = dst_type->e.numeric.type;
unsigned int k;
VKD3D_ASSERT(type == src1->node.data_type->e.numeric.type);
VKD3D_ASSERT(type == src2->node.data_type->e.numeric.type);
VKD3D_ASSERT(type == src3->node.data_type->e.numeric.type);
for (k = 0; k < dst_type->e.numeric.dimx; ++k)
{
switch (type)
{
case HLSL_TYPE_FLOAT:
case HLSL_TYPE_HALF:
dst->u[k].f = fmaf(src1->value.u[k].f, src2->value.u[k].f, src3->value.u[k].f);
break;
case HLSL_TYPE_DOUBLE:
dst->u[k].d = fma(src1->value.u[k].d, src2->value.u[k].d, src3->value.u[k].d);
break;
case HLSL_TYPE_INT:
case HLSL_TYPE_MIN16UINT:
case HLSL_TYPE_UINT:
dst->u[k].u = src1->value.u[k].u * src2->value.u[k].u + src3->value.u[k].u;
break;
default:
FIXME("Fold 'mad' for type %s.\n", debug_hlsl_type(ctx, dst_type));
return false;
}
}
return true;
}
static bool fold_max(struct hlsl_ctx *ctx, struct hlsl_constant_value *dst, const struct hlsl_type *dst_type,
const struct hlsl_ir_constant *src1, const struct hlsl_ir_constant *src2)
{
@@ -1373,6 +1411,10 @@ bool hlsl_fold_constant_exprs(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr,
success = fold_dp2add(ctx, &res, instr->data_type, arg1, arg2, arg3);
break;
case HLSL_OP3_MAD:
success = fold_mad(ctx, &res, instr->data_type, arg1, arg2, arg3);
break;
case HLSL_OP3_TERNARY:
success = fold_ternary(ctx, &res, instr->data_type, arg1, arg2, arg3);
break;