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 59dcda7..87eabf1 100644 (file)
--- 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());
-   }
 }