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vkd3d-shader/hlsl: Flatten conditional branches containing stores.

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For an if block

    if (cond)
    {
        <then_block>
    }
    else
    {
        <else_block>
    }

We flatten it by first replacing any store instruction `v[[k]] = x`
in the then_block with the following:

    1: load(v[[k]])
    2: cond ? x : @1
    3: v[[k]] = @2

Similarly, we replace any store instruction `v[[k]] = x` in the
else_block with the following:

    1: load(v[[k]])
    2: cond ? @1 : x
    3: v[[k]] = @2

Then we can concatenate <then_block> and <else_block> together and
get rid of the if block.
This commit is contained in:
Shaun Ren
2025-10-16 23:30:46 -04:00
committed by Henri Verbeet
parent 200e66ba4f
commit 4d5a1528ab
Notes: Henri Verbeet 2025-10-30 19:59:51 +01:00 
Approved-by: Francisco Casas (@fcasas)
Approved-by: Elizabeth Figura (@zfigura)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1732
10 changed files with 374 additions and 141 deletions
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1
libs/vkd3d-shader/vkd3d_shader_private.h
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@@ -175,6 +175,7 @@ enum vkd3d_shader_error
VKD3D_SHADER_ERROR_HLSL_MISSING_PRIMITIVE_TYPE = 5043,
VKD3D_SHADER_ERROR_HLSL_MISPLACED_STREAM_OUTPUT = 5044,
VKD3D_SHADER_ERROR_HLSL_MISSING_INPUT_PATCH = 5045,
VKD3D_SHADER_ERROR_HLSL_CANNOT_FLATTEN = 5046,
VKD3D_SHADER_WARNING_HLSL_IMPLICIT_TRUNCATION = 5300,
VKD3D_SHADER_WARNING_HLSL_DIVISION_BY_ZERO = 5301,