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i965/fs: Copy propagate from load_payload.

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But only into non-load_payload instructions. Otherwise we would prevent
register coalescing from combining identical payloads.
This commit is contained in:
Matt Turner
2014-04-17 15:13:00 -07:00
parent 31ae9c25ff
commit 18372a7100
1 changed files with 22 additions and 0 deletions
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src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
+22
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@@ -42,6 +42,7 @@ namespace { /* avoid conflict with opt_copy_propagation_elements */
struct acp_entry : public exec_node {
fs_reg dst;
fs_reg src;
enum opcode opcode;
};
struct block_data {
@@ -287,6 +288,10 @@ fs_visitor::try_copy_propagate(fs_inst *inst, int arg, acp_entry *entry)
if (entry->src.file == IMM)
return false;
if (entry->opcode == SHADER_OPCODE_LOAD_PAYLOAD &&
inst->opcode == SHADER_OPCODE_LOAD_PAYLOAD)
return false;
/* Bail if inst is reading more than entry is writing. */
if ((inst->regs_read(this, arg) * inst->src[arg].stride *
type_sz(inst->src[arg].type)) > type_sz(entry->dst.type))
@@ -569,7 +574,24 @@ fs_visitor::opt_copy_propagate_local(void *copy_prop_ctx, bblock_t *block,
acp_entry *entry = ralloc(copy_prop_ctx, acp_entry);
entry->dst = inst->dst;
entry->src = inst->src[0];
entry->opcode = inst->opcode;
acp[entry->dst.reg % ACP_HASH_SIZE].push_tail(entry);
} else if (inst->opcode == SHADER_OPCODE_LOAD_PAYLOAD &&
inst->dst.file == GRF) {
for (int i = 0; i < inst->sources; i++) {
if (inst->src[i].file == GRF) {
acp_entry *entry = ralloc(copy_prop_ctx, acp_entry);
entry->dst = inst->dst;
entry->dst.reg_offset = i;
entry->src = inst->src[i];
entry->opcode = inst->opcode;
if (!entry->dst.equals(inst->src[i])) {
acp[entry->dst.reg % ACP_HASH_SIZE].push_tail(entry);
} else {
ralloc_free(entry);
}
}
}
}
}