I think this was used for coalescing out partly dead large virtual
registers, but the patch that enabled that caused regressions and didn't
make it upstream.
---
src/mesa/drivers/dri/i965/brw_fs_register_coalesce.cpp | 15 +++++----------
1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_register_coalesce.cpp
b/src/mesa/drivers/dri/i965/brw_fs_register_coalesce.cpp
index 5c16798..35ef3ff 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_register_coalesce.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_register_coalesce.cpp
@@ -158,11 +158,8 @@ fs_visitor::register_coalesce()
if (channels_remaining)
continue;
- bool removed = false;
for (int i = 0; i < src_size; i++) {
if (mov[i]) {
- removed = true;
-
mov[i]->opcode = BRW_OPCODE_NOP;
mov[i]->conditional_mod = BRW_CONDITIONAL_NONE;
mov[i]->dst = reg_undef;
@@ -195,13 +192,11 @@ fs_visitor::register_coalesce()
}
}
- if (removed) {
- live_intervals->start[var_to] = MIN2(live_intervals->start[var_to],
- live_intervals->start[var_from]);
- live_intervals->end[var_to] = MAX2(live_intervals->end[var_to],
- live_intervals->end[var_from]);
- reg_from = -1;
- }
+ live_intervals->start[var_to] = MIN2(live_intervals->start[var_to],
+ live_intervals->start[var_from]);
+ live_intervals->end[var_to] = MAX2(live_intervals->end[var_to],
+ live_intervals->end[var_from]);
+ reg_from = -1;
}
foreach_list_safe(node, &this->instructions) {
--
1.8.3.2
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