From: Eric Anholt <eric@anholt.net>
Date: Thu, 7 Jul 2011 23:41:20 +0000 (-0700)
Subject: i965: Fix fp-lit-src-equals-dst.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e3ea5bc08e32119d05bce543c07c61ce93869e60;p=mesa.git

i965: Fix fp-lit-src-equals-dst.

We were stomping over the source for the body of the LIT instruction
when doing the MOV of 1.0 to the uninteresting channels.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_wm_fp.c b/src/mesa/drivers/dri/i965/brw_wm_fp.c
index 59dcda7b414..87eabf1fba1 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_fp.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_fp.c
@@ -611,7 +611,17 @@ static void precalc_lit( struct brw_wm_compile *c,
 {
    struct prog_src_register src0 = inst->SrcReg[0];
    struct prog_dst_register dst = inst->DstReg;
-   
+
+   if (dst.WriteMask & WRITEMASK_YZ) {
+      emit_op(c,
+	      OPCODE_LIT,
+	      dst_mask(dst, WRITEMASK_YZ),
+	      inst->SaturateMode,
+	      src0,
+	      src_undef(),
+	      src_undef());
+   }
+
    if (dst.WriteMask & WRITEMASK_XW) {
       struct prog_instruction *swz;
 
@@ -627,16 +637,6 @@ static void precalc_lit( struct brw_wm_compile *c,
       /* Avoid letting the negation flag of src0 affect our 1 constant. */
       swz->SrcReg[0].Negate = NEGATE_NONE;
    }
-
-   if (dst.WriteMask & WRITEMASK_YZ) {
-      emit_op(c,
-	      OPCODE_LIT,
-	      dst_mask(dst, WRITEMASK_YZ),
-	      inst->SaturateMode,
-	      src0,
-	      src_undef(),
-	      src_undef());
-   }
 }