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vkd3d-shader/hlsl: Implement copy-propagation of derefs with a non-constant index.

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We implement a transformation that propagates loads with a single
non-constant index in its deref path. Consider a load of the form
var[[a0][a1]...[i]...[an]], where ak are integral constants, and i is
an arbitrary non-constant node. If, for all j, the following holds:

  var[[a0][a1]...[j]...[an]] = x[[c0*j + d0][c1*j + d1]...[cm*j + dm]],

where ck, dk are constants, then we can replace the load with
x[[c0*i + d0]...[cm*i + dm]]. This pass is implemented by
copy_propagation_replace_with_deref().
This commit is contained in:
Shaun Ren
2025-02-26 22:34:30 -05:00
committed by Henri Verbeet
parent f484527cfb
commit 7ab7b2ab8b
Notes: Henri Verbeet 2025-03-12 22:20:19 +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/1388
3 changed files with 346 additions and 49 deletions
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libs/vkd3d-shader/hlsl.h
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@@ -1572,6 +1572,7 @@ int hlsl_emit_bytecode(struct hlsl_ctx *ctx, struct hlsl_ir_function_decl *entry
enum vkd3d_shader_target_type target_type, struct vkd3d_shader_code *out);
int hlsl_emit_effect_binary(struct hlsl_ctx *ctx, struct vkd3d_shader_code *out);
bool hlsl_init_deref(struct hlsl_ctx *ctx, struct hlsl_deref *deref, struct hlsl_ir_var *var, unsigned int path_len);
bool hlsl_init_deref_from_index_chain(struct hlsl_ctx *ctx, struct hlsl_deref *deref, struct hlsl_ir_node *chain);
bool hlsl_copy_deref(struct hlsl_ctx *ctx, struct hlsl_deref *deref, const struct hlsl_deref *other);