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i965/fs: Walk instructions in reverse in saturate propagation.

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When we find a mov.sat, we search backwards. We might as well search
everything else backwards as well and potentially look at fewer
instructions.

This change enables the next patch.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
This commit is contained in:
Matt Turner
2014-09-08 12:05:25 -07:00
parent ed48f91275
commit 82bdb559a1
1 changed files with 3 additions and 3 deletions
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src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
+3 -3
View File
@@ -32,10 +32,10 @@ static bool
opt_saturate_propagation_local(fs_visitor *v, bblock_t *block)
{
bool progress = false;
int ip = block->start_ip - 1;
int ip = block->end_ip + 1;
foreach_inst_in_block(fs_inst, inst, block) {
ip++;
foreach_inst_in_block_reverse(fs_inst, inst, block) {
ip--;
if (inst->opcode != BRW_OPCODE_MOV ||
inst->dst.file != GRF ||