From: Christoph Bumiller <e0425955@student.tuwien.ac.at>
Date: Tue, 22 Feb 2011 20:50:17 +0000 (+0100)
Subject: nvc0: kick out empty live ranges
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=f01748355360ac98c772ce8b82ca0e6c2f94629a;p=mesa.git

nvc0: kick out empty live ranges

They affect overlap tests even though they're actually empty.
---

diff --git a/src/gallium/drivers/nvc0/nvc0_pc_regalloc.c b/src/gallium/drivers/nvc0/nvc0_pc_regalloc.c
index d7213949483..f4afe083e2d 100644
--- a/src/gallium/drivers/nvc0/nvc0_pc_regalloc.c
+++ b/src/gallium/drivers/nvc0/nvc0_pc_regalloc.c
@@ -87,6 +87,9 @@ add_range_ex(struct nv_value *val, int bgn, int end, struct nv_range *new_range)
 {
    struct nv_range *range, **nextp = &val->livei;
 
+   if (bgn == end) /* [a, a) is invalid / empty */
+      return TRUE;
+
    for (range = val->livei; range; range = range->next) {
       if (end < range->bgn)
          break; /* insert before */