From: Christoph Bumiller <e0425955@student.tuwien.ac.at>
Date: Thu, 26 Nov 2009 16:03:00 +0000 (+0100)
Subject: nv50: don't permanently negate src in emit_ddy
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=3f471c7948425a9c8ae23a563e0e816954a7589a;p=mesa.git

nv50: don't permanently negate src in emit_ddy
---

diff --git a/src/gallium/drivers/nv50/nv50_program.c b/src/gallium/drivers/nv50/nv50_program.c
index 855079f2939..f93c864c2a2 100644
--- a/src/gallium/drivers/nv50/nv50_program.c
+++ b/src/gallium/drivers/nv50/nv50_program.c
@@ -1440,19 +1440,25 @@ emit_ddx(struct nv50_pc *pc, struct nv50_reg *dst, struct nv50_reg *src)
 static void
 emit_ddy(struct nv50_pc *pc, struct nv50_reg *dst, struct nv50_reg *src)
 {
+	struct nv50_reg *r = src;
 	struct nv50_program_exec *e = exec(pc);
 
 	assert(src->type == P_TEMP);
 
-	if (!(src->mod & NV50_MOD_NEG)) /* ! double negation */
-		emit_neg(pc, src, src);
+	if (!(src->mod & NV50_MOD_NEG)) { /* ! double negation */
+		r = alloc_temp(pc, NULL);
+		emit_neg(pc, r, src);
+	}
 
 	e->inst[0] = 0xc0150000;
 	e->inst[1] = 0x8a400000;
 	set_long(pc, e);
 	set_dst(pc, dst, e);
-	set_src_0(pc, src, e);
-	set_src_2(pc, src, e);
+	set_src_0(pc, r, e);
+	set_src_2(pc, r, e);
+
+	if (r != src)
+		free_temp(pc, r);
 
 	emit(pc, e);
 }