prog_optimize: Only merge writes to temporary registers

In one optimization pass, register files may have been messed therefore
merging instructions which use the same index in two different register
files.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/mesa/program/prog_optimize.c b/src/mesa/program/prog_optimize.c
index ab878755e25..0dc779073db 100644
--- a/src/mesa/program/prog_optimize.c
+++ b/src/mesa/program/prog_optimize.c
@@ -758,7 +758,11 @@ _mesa_remove_extra_moves(struct gl_program *prog)
          nesting--;
          break;
       case OPCODE_MOV:
-         if (i > 0 && can_downward_mov_be_modifed(mov) && nesting == 0) {
+         if (i > 0 &&
+             can_downward_mov_be_modifed(mov) &&
+             mov->SrcReg[0].File == PROGRAM_TEMPORARY &&
+             nesting == 0)
+         {
 
             /* see if this MOV can be removed */
             const GLuint id = mov->SrcReg[0].Index;