Improves three programs in Unigine Tropics.
total instructions in shared programs: 1549880 -> 1549868 (-0.00%)
instructions in affected programs: 858 -> 846 (-1.40%)
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 24 +++++++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 39041e3..e4ac0a5 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2270,10 +2270,15 @@ fs_visitor::register_coalesce()
int reg_from = -1, reg_to = -1;
int reg_to_offset[MAX_SAMPLER_MESSAGE_SIZE];
fs_inst *mov[MAX_SAMPLER_MESSAGE_SIZE];
+ int last_use[MAX_SAMPLER_MESSAGE_SIZE];
+ int next_ip = 0;
foreach_list_safe(node, &this->instructions) {
fs_inst *inst = (fs_inst *)node;
+ int ip = next_ip;
+ next_ip++;
+
if (inst->opcode != BRW_OPCODE_MOV ||
inst->is_partial_write() ||
inst->saturate ||
@@ -2306,6 +2311,14 @@ fs_visitor::register_coalesce()
channels_remaining = src_size;
memset(mov, 0, sizeof(mov));
+ fs_reg src = inst->src[0];
+ for (int i = 0; i < src_size; i++) {
+ src.reg_offset = i;
+ int var = live_intervals->var_from_reg(&src);
+
+ last_use[i] = live_intervals->end[var];
+ }
+
reg_to = inst->dst.reg;
}
@@ -2317,7 +2330,16 @@ fs_visitor::register_coalesce()
mov[offset] = inst;
channels_remaining--;
- if (channels_remaining)
+ int live_channels_remaining = channels_remaining;
+ for (int i = 0; i < src_size; i++) {
+ if (!mov[i]) {
+ if (last_use[i] < ip) {
+ live_channels_remaining--;
+ }
+ }
+ }
+
+ if (live_channels_remaining)
continue;
for (int i = 0; i < src_size; i++) {
--
1.8.3.2
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