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i965/vec4: Don't emit null MOVs in CSE.

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Port of commit 219b43c6 to the vec4 code.
This commit is contained in:
Matt Turner 2014-06-11 15:24:52 -07:00
parent 949991cc99
commit 7921bf0062
1 changed files with 7 additions and 5 deletions
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12
src/mesa/drivers/dri/i965/brw_vec4_cse.cpp
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@ -159,7 +159,7 @@ vec4_visitor::opt_cse_local(bblock_t *block, exec_list *aeb)
* If we don't have a temporary already, make one.
*/
bool no_existing_temp = entry->tmp.file == BAD_FILE;
if (no_existing_temp) {
if (no_existing_temp && !entry->generator->dst.is_null()) {
entry->tmp = src_reg(this, glsl_type::float_type);
entry->tmp.type = inst->dst.type;
entry->tmp.swizzle = BRW_SWIZZLE_XYZW;
@ -170,10 +170,12 @@ vec4_visitor::opt_cse_local(bblock_t *block, exec_list *aeb)
}
/* dest <- temp */
assert(inst->dst.type == entry->tmp.type);
vec4_instruction *copy = MOV(inst->dst, entry->tmp);
copy->force_writemask_all = inst->force_writemask_all;
inst->insert_before(copy);
if (!inst->dst.is_null()) {
assert(inst->dst.type == entry->tmp.type);
vec4_instruction *copy = MOV(inst->dst, entry->tmp);
copy->force_writemask_all = inst->force_writemask_all;
inst->insert_before(copy);
}
/* Set our iterator so that next time through the loop inst->next
* will get the instruction in the basic block after the one we've