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vkd3d-shader: Eliminate unused assignments.

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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 2021-03-18 00:22:22 -05:00 committed by Alexandre Julliard
parent f73b3385c7
commit 3377f2445a
1 changed files with 27 additions and 4 deletions
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31
libs/vkd3d-shader/hlsl_codegen.c
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@ -244,6 +244,19 @@ static bool dce(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, void *context)
break;
case HLSL_IR_ASSIGNMENT:
{
struct hlsl_ir_assignment *assignment = hlsl_ir_assignment(instr);
struct hlsl_ir_var *var = assignment->lhs.var;
if (var->last_read < instr->index)
{
list_remove(&instr->entry);
hlsl_free_instr(instr);
return true;
}
break;
}
case HLSL_IR_IF:
case HLSL_IR_JUMP:
case HLSL_IR_LOOP:
@ -371,8 +384,18 @@ static void compute_liveness_recurse(struct list *instrs, unsigned int loop_firs
static void compute_liveness(struct hlsl_ctx *ctx, struct hlsl_ir_function_decl *entry_func)
{
struct hlsl_scope *scope;
struct hlsl_ir_var *var;
/* Index 0 means unused; index 1 means function entry, so start at 2. */
index_instructions(entry_func->body, 2);
LIST_FOR_EACH_ENTRY(scope, &ctx->scopes, struct hlsl_scope, entry)
{
LIST_FOR_EACH_ENTRY(var, &scope->vars, struct hlsl_ir_var, scope_entry)
var->first_write = var->last_read = 0;
}
LIST_FOR_EACH_ENTRY(var, &ctx->globals->vars, struct hlsl_ir_var, scope_entry)
{
var->first_write = 1;
@ -399,16 +422,16 @@ int hlsl_emit_dxbc(struct hlsl_ctx *ctx, struct hlsl_ir_function_decl *entry_fun
while (transform_ir(ctx, fold_redundant_casts, entry_func->body, NULL));
while (transform_ir(ctx, split_struct_copies, entry_func->body, NULL));
while (transform_ir(ctx, fold_constants, entry_func->body, NULL));
do
compute_liveness(ctx, entry_func);
while (transform_ir(ctx, dce, entry_func->body, NULL));
/* Index 0 means unused; index 1 means function entry, so start at 2. */
index_instructions(entry_func->body, 2);
compute_liveness(ctx, entry_func);
if (TRACE_ON())
rb_for_each_entry(&ctx->functions, dump_function, NULL);
compute_liveness(ctx, entry_func);
if (ctx->failed)
return VKD3D_ERROR_INVALID_SHADER;
return VKD3D_ERROR_NOT_IMPLEMENTED;