From: Matt Turner <mattst88@gmail.com>
Date: Tue, 16 Dec 2014 19:30:12 +0000 (-0800)
Subject: i965/fs: Add a comment explaining what saturate propagation does.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2308b3bef25723b1ebff0b71f2f87dd44050cc2c;p=mesa.git

i965/fs: Add a comment explaining what saturate propagation does.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp b/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
index a4145ac27d9..a9966a4d648 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
@@ -26,6 +26,20 @@
 #include "brw_cfg.h"
 
 /** @file brw_fs_saturate_propagation.cpp
+ *
+ * Implements a pass that propagates the SAT modifier from a MOV.SAT into the
+ * instruction that produced the source of the MOV.SAT, thereby allowing the
+ * MOV's src and dst to be coalesced and the MOV removed.
+ *
+ * For instance,
+ *
+ *    ADD     tmp, src0, src1
+ *    MOV.SAT dst, tmp
+ *
+ * would be transformed into
+ *
+ *    ADD.SAT tmp, src0, src1
+ *    MOV     dst, tmp
  */
 
 static bool