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i965/vec4: Perform CSE on MOV ..., VF instructions.

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Port of commit a28ad9d4 from the fs backend.

No shader-db changes since we don't emit MOV ..., VF instructions yet.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Matt Turner
2014-04-03 14:29:30 -07:00
parent 44573458bd
commit 7463e6d61b
1 changed files with 11 additions and 5 deletions
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src/mesa/drivers/dri/i965/brw_vec4_cse.cpp
+11 -5
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@@ -48,6 +48,7 @@ static bool
is_expression(const vec4_instruction *const inst)
{
switch (inst->opcode) {
case BRW_OPCODE_MOV:
case BRW_OPCODE_SEL:
case BRW_OPCODE_NOT:
case BRW_OPCODE_AND:
@@ -154,11 +155,16 @@ vec4_visitor::opt_cse_local(bblock_t *block)
}
if (!found) {
/* Our first sighting of this expression. Create an entry. */
aeb_entry *entry = ralloc(cse_ctx, aeb_entry);
entry->tmp = src_reg(); /* file will be BAD_FILE */
entry->generator = inst;
aeb.push_tail(entry);
if (inst->opcode != BRW_OPCODE_MOV ||
(inst->opcode == BRW_OPCODE_MOV &&
inst->src[0].file == IMM &&
inst->src[0].type == BRW_REGISTER_TYPE_VF)) {
/* Our first sighting of this expression. Create an entry. */
aeb_entry *entry = ralloc(cse_ctx, aeb_entry);
entry->tmp = src_reg(); /* file will be BAD_FILE */
entry->generator = inst;
aeb.push_tail(entry);
}
} else {
/* This is at least our second sighting of this expression.
* If we don't have a temporary already, make one.