From: Rob Clark <robdclark@chromium.org>
Date: Thu, 19 Dec 2019 17:48:39 +0000 (-0800)
Subject: freedreno/ir3: fix crash when no non-input instructions
X-Git-Tag: upstream/20.1.8~3773
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=54c795f8297d5087b013777bddac32ed47941cb7;p=platform%2Fupstream%2Fmesa.git

freedreno/ir3: fix crash when no non-input instructions

This scenario can come up with block-sched and nop-sched moved to after
RA.  So lets fix it first to keep things bisectable.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3569>
---

diff --git a/src/freedreno/ir3/ir3_ra.c b/src/freedreno/ir3/ir3_ra.c
index 789c08f..3b54bdb 100644
--- a/src/freedreno/ir3/ir3_ra.c
+++ b/src/freedreno/ir3/ir3_ra.c
@@ -775,7 +775,7 @@ ra_block_compute_live_ranges(struct ir3_ra_ctx *ctx, struct ir3_block *block)
 
 				def(name, id->defn);
 
-				if (instr->opc == OPC_META_INPUT)
+				if ((instr->opc == OPC_META_INPUT) && first_non_input)
 					use(name, first_non_input);
 
 				if (is_high(id->defn)) {