Mesa (master): i965: Update the live interval when coalescing regs.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: b8613d70da34217b98edb9ac9e0a4c9a6598d0b3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b8613d70da34217b98edb9ac9e0a4c9a6598d0b3

Author: Eric Anholt <eric at anholt.net>
Date:   Wed Oct 13 22:39:06 2010 -0700

i965: Update the live interval when coalescing regs.

---

 src/mesa/drivers/dri/i965/brw_fs.cpp |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index c0fee11..e2c7dbd 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2563,6 +2563,10 @@ fs_visitor::register_coalesce()
 	 continue;
       }
 
+      /* Update live interval so we don't have to recalculate. */
+      this->virtual_grf_use[inst->src[0].reg] = MAX2(virtual_grf_use[inst->src[0].reg],
+						     virtual_grf_use[inst->dst.reg]);
+
       /* Rewrite the later usage to point at the source of the move to
        * be removed.
        */