From: Eric Anholt <eric@anholt.net>
Date: Mon, 11 Oct 2010 20:38:38 +0000 (-0700)
Subject: i965: Don't compute-to-MRF in gen6 math instructions.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=317dbf4613ebf56ca14ee70c1ad6e620ad7942c2;p=mesa.git

i965: Don't compute-to-MRF in gen6 math instructions.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 0f1f4fa26ef..0353bb54e72 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -2616,6 +2616,22 @@ fs_visitor::compute_to_mrf()
 	    if (scan_inst->mlen)
 	       break;
 
+	    if (intel->gen >= 6) {
+	       /* gen6 math instructions must have the destination be
+		* GRF, so no compute-to-MRF for them.
+		*/
+	       if (scan_inst->opcode == FS_OPCODE_RCP ||
+		   scan_inst->opcode == FS_OPCODE_RSQ ||
+		   scan_inst->opcode == FS_OPCODE_SQRT ||
+		   scan_inst->opcode == FS_OPCODE_EXP2 ||
+		   scan_inst->opcode == FS_OPCODE_LOG2 ||
+		   scan_inst->opcode == FS_OPCODE_SIN ||
+		   scan_inst->opcode == FS_OPCODE_COS ||
+		   scan_inst->opcode == FS_OPCODE_POW) {
+		  break;
+	       }
+	    }
+
 	    if (scan_inst->dst.reg_offset == inst->src[0].reg_offset) {
 	       /* Found the creator of our MRF's source value. */
 	       found = true;