From: Eric Anholt <eric@anholt.net>
Date: Wed, 6 Oct 2010 18:00:31 +0000 (-0700)
Subject: i965: Don't do 1/w multiplication in new FS for gen6
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=fe6efc25ed3c1edf26073c4e6b6a3a45c857c1eb;p=mesa.git

i965: Don't do 1/w multiplication in new FS for gen6

Not needed now that we're doing barycentric.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 6e5ea0782e1..7327c3a700e 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -810,12 +810,14 @@ fs_visitor::emit_general_interpolation(ir_variable *ir)
 	 }
 	 attr.reg_offset -= type->vector_elements;
 
-	 for (unsigned int c = 0; c < type->vector_elements; c++) {
-	    emit(fs_inst(BRW_OPCODE_MUL,
-			 attr,
-			 attr,
-			 this->pixel_w));
-	    attr.reg_offset++;
+	 if (intel->gen < 6) {
+	    for (unsigned int c = 0; c < type->vector_elements; c++) {
+	       emit(fs_inst(BRW_OPCODE_MUL,
+			    attr,
+			    attr,
+			    this->pixel_w));
+	       attr.reg_offset++;
+	    }
 	 }
 	 location++;
       }