Module: Mesa
Branch: master
Commit: 2fc44c4dc8077abc5515786933424e85b12f3cc2
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=2fc44c4dc8077abc5515786933424e85b12f3cc2
Author: Alyssa Rosenzweig <alyssa.rosenzw...@collabora.com>
Date: Mon Aug 12 15:29:03 2019 -0700
pan/midgard: Add dont_eliminate flag
We need to treat fragment writes specially.
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzw...@collabora.com>
---
src/panfrost/midgard/compiler.h | 3 +++
src/panfrost/midgard/midgard_opt_dce.c | 1 +
2 files changed, 4 insertions(+)
diff --git a/src/panfrost/midgard/compiler.h b/src/panfrost/midgard/compiler.h
index cf7547ccda3..52113dda33f 100644
--- a/src/panfrost/midgard/compiler.h
+++ b/src/panfrost/midgard/compiler.h
@@ -117,6 +117,9 @@ typedef struct midgard_instruction {
bool writeout;
bool prepacked_branch;
+ /* Kind of a hack, but hint against aggressive DCE */
+ bool dont_eliminate;
+
/* Masks in a saneish format. One bit per channel, not packed fancy.
* Use this instead of the op specific ones, and switch over at emit
* time */
diff --git a/src/panfrost/midgard/midgard_opt_dce.c
b/src/panfrost/midgard/midgard_opt_dce.c
index 9964675763c..f2011831944 100644
--- a/src/panfrost/midgard/midgard_opt_dce.c
+++ b/src/panfrost/midgard/midgard_opt_dce.c
@@ -97,6 +97,7 @@ midgard_opt_post_move_eliminate(compiler_context *ctx,
midgard_block *block, str
if (ins->type != TAG_ALU_4) continue;
if (ins->compact_branch) continue;
if (!OP_IS_MOVE(ins->alu.op)) continue;
+ if (ins->dont_eliminate) continue;
/* Check we're to the same place post-RA */
unsigned iA = ins->ssa_args.dest;
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