From 3b743603383df45ae3d0af428c93a8926a2152e6 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Pavel=20Ondra=C4=8Dka?= <pavel.ondracka@gmail.com>
Date: Wed, 9 Aug 2023 08:32:01 +0200
Subject: [PATCH] r300: exit early in presubtract is not supported

Reviewed-by: Filip Gawin <filip.gawin@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24830>
---
 src/gallium/drivers/r300/compiler/radeon_optimize.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/gallium/drivers/r300/compiler/radeon_optimize.c b/src/gallium/drivers/r300/compiler/radeon_optimize.c
index d6a911d..9ecb9ec 100644
--- a/src/gallium/drivers/r300/compiler/radeon_optimize.c
+++ b/src/gallium/drivers/r300/compiler/radeon_optimize.c
@@ -809,15 +809,18 @@ static int peephole_mul_omod(
  */
 static int peephole(struct radeon_compiler * c, struct rc_instruction * inst)
 {
-	switch(inst->U.I.Opcode){
+	if (!c->has_presub)
+		return 0;
+
+	switch(inst->U.I.Opcode) {
 	case RC_OPCODE_ADD:
-		if (c->has_presub) {
-			if(peephole_add_presub_inv(c, inst))
-				return 1;
-			if(peephole_add_presub_add(c, inst))
-				return 1;
-		}
+	{
+		if (peephole_add_presub_inv(c, inst))
+			return 1;
+		if (peephole_add_presub_add(c, inst))
+			return 1;
 		break;
+	}
 	default:
 		break;
 	}
-- 
2.7.4