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vkd3d-shader: Add a dead code elimination pass.

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Signed-off-by: Zebediah Figura <zfigura@codeweavers.com>
Signed-off-by: Matteo Bruni <mbruni@codeweavers.com>
Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Zebediah Figura 2021-03-16 16:31:54 -05:00 committed by Alexandre Julliard
parent 14993f34c9
commit 7c2083d374
1 changed files with 27 additions and 0 deletions
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27
libs/vkd3d-shader/hlsl_codegen.c
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@ -120,6 +120,32 @@ static bool fold_constants(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, voi
return true; return true;
} }
static bool dce(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, void *context)
{
switch (instr->type)
{
case HLSL_IR_CONSTANT:
case HLSL_IR_EXPR:
case HLSL_IR_LOAD:
case HLSL_IR_SWIZZLE:
if (list_empty(&instr->uses))
{
list_remove(&instr->entry);
hlsl_free_instr(instr);
return true;
}
break;
case HLSL_IR_ASSIGNMENT:
case HLSL_IR_IF:
case HLSL_IR_JUMP:
case HLSL_IR_LOOP:
break;
}
return false;
}
/* Allocate a unique, ordered index to each instruction, which will be used for /* Allocate a unique, ordered index to each instruction, which will be used for
* computing liveness ranges. */ * computing liveness ranges. */
static unsigned int index_instructions(struct list *instrs, unsigned int index) static unsigned int index_instructions(struct list *instrs, unsigned int index)
@ -264,6 +290,7 @@ int hlsl_emit_dxbc(struct hlsl_ctx *ctx, struct hlsl_ir_function_decl *entry_fun
list_move_head(entry_func->body, &ctx->static_initializers); list_move_head(entry_func->body, &ctx->static_initializers);
while (transform_ir(ctx, fold_constants, entry_func->body, NULL)); while (transform_ir(ctx, fold_constants, entry_func->body, NULL));
while (transform_ir(ctx, dce, entry_func->body, NULL));
/* Index 0 means unused; index 1 means function entry, so start at 2. */ /* Index 0 means unused; index 1 means function entry, so start at 2. */
index_instructions(entry_func->body, 2); index_instructions(entry_func->body, 2);