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vkd3d-shader/hlsl: Allow non-constant deref propagation on SM1.

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Note that we still have to preempt the propagation to SM1 pixel shader
uniforms. Otherwise this will turn the many constant derefs that appear
from the <index-val> copy generated in lower_index_loads() into a single
non-constant deref, causing it to allocate all the registers instead of
up until the last one used.
This commit is contained in:
Francisco Casas
2025-03-17 21:35:00 -03:00
committed by Henri Verbeet
parent f65e6265e0
commit 3ead8d532b
Notes: Henri Verbeet 2025-04-02 19:43:14 +02:00 
Approved-by: Elizabeth Figura (@zfigura)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1434
3 changed files with 11 additions and 11 deletions
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12
libs/vkd3d-shader/hlsl_codegen.c
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@ -1916,12 +1916,6 @@ static bool copy_propagation_replace_with_deref(struct hlsl_ctx *ctx,
if (!nonconst_index_from_deref(ctx, deref, &nonconst_i, &base, &scale, &count))
return false;
if (hlsl_version_lt(ctx, 4, 0))
{
TRACE("Non-constant index propagation is not yet supported for SM1.\n");
return false;
}
VKD3D_ASSERT(count);
hlsl_block_init(&block);
@ -1950,6 +1944,12 @@ static bool copy_propagation_replace_with_deref(struct hlsl_ctx *ctx,
else if (x != idx->src.var)
goto done;
if (hlsl_version_lt(ctx, 4, 0) && x->is_uniform && ctx->profile->type != VKD3D_SHADER_TYPE_VERTEX)
{
TRACE("Skipping propagating non-constant deref to SM1 uniform %s.\n", var->name);
goto done;
}
if (i == 0)
{
path_len = idx->src.path_len;