With NIR:
instructions in affected programs: 111508 -> 109193 (-2.08%)
helped: 507
Without NIR:
instructions in affected programs: 28763 -> 28474 (-1.00%)
helped: 186
---
src/mesa/drivers/dri/i965/brw_vec4.cpp | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp
b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index ed49cd3..d09a8dd 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -1021,6 +1021,27 @@ vec4_visitor::opt_register_coalesce()
inst->src[0].abs || inst->src[0].negate || inst->src[0].reladdr)
continue;
+ if (inst->dst.file == inst->src[0].file &&
+ inst->dst.reg == inst->src[0].reg &&
+ inst->dst.reg_offset == inst->src[0].reg_offset) {
+ bool is_nop_mov = true;
+
+ for (unsigned c = 0; c < 4; c++) {
+ if ((inst->dst.writemask & (1 << c)) == 0)
+ continue;
+
+ if (BRW_GET_SWZ(inst->src[0].swizzle, c) != c) {
+ is_nop_mov = false;
+ break;
+ }
+ }
+
+ if (is_nop_mov) {
+ inst->remove(block);
+ continue;
+ }
+ }
+
bool to_mrf = (inst->dst.file == MRF);
/* Can't coalesce this GRF if someone else was going to
--
2.4.6
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