Module: Mesa
Branch: master
Commit: bc0e1591f64b8b3f2693fceaaa8bba9198e26171
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=bc0e1591f64b8b3f2693fceaaa8bba9198e26171
Author: Eric Anholt <e...@anholt.net>
Date: Fri Mar 15 14:31:46 2013 -0700
i965/fs: Avoid inappropriate optimization with regs_written > 1.
Right now we don't have anything with regs_written() > 1 and !inst->mlen,
but that's about to change.
NOTE: This is a candidate for the 9.1 branch.
Reviewed-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index da3ac15..c60d041 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2082,6 +2082,12 @@ fs_visitor::compute_to_mrf()
break;
}
+ /* Things returning more than one register would need us to
+ * understand coalescing out more than one MOV at a time.
+ */
+ if (scan_inst->regs_written() > 1)
+ break;
+
/* SEND instructions can't have MRF as a destination. */
if (scan_inst->mlen)
break;
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