From: Karol Herbst <nouveau@karolherbst.de>
Date: Wed, 27 Jan 2016 17:25:07 +0000 (+0100)
Subject: nv50/ir: run DCE backwards
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3aa681449ed030ba8b9c56f0a6f2b08bd1fb15a6;p=mesa.git

nv50/ir: run DCE backwards

Reduces calls up to 50%

Signed-off-by: Karol Herbst <nouveau@karolherbst.de>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
---

diff --git a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
index b2c9fdfc7a4..bda9c7d0c52 100644
--- a/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
+++ b/src/gallium/drivers/nouveau/codegen/nv50_ir_peephole.cpp
@@ -3187,10 +3187,10 @@ DeadCodeElim::buryAll(Program *prog)
 bool
 DeadCodeElim::visit(BasicBlock *bb)
 {
-   Instruction *next;
+   Instruction *prev;
 
-   for (Instruction *i = bb->getFirst(); i; i = next) {
-      next = i->next;
+   for (Instruction *i = bb->getExit(); i; i = prev) {
+      prev = i->prev;
       if (i->isDead()) {
          ++deadCount;
          delete_Instruction(prog, i);