parser: Initialize unused instruction source registers

The 965 driver expects unused source registers (e.g., SrcReg[2] of a
DP3 instruction) to have a register file of PROGRAM_UNDEFINED.
Initializing these source registers ensures that this happens.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/mesa/shader/program_parse.y b/src/mesa/shader/program_parse.y
index 0260196210..fe9022b121 100644
--- a/src/mesa/shader/program_parse.y
+++ b/src/mesa/shader/program_parse.y
@@ -1774,11 +1774,15 @@ asm_instruction_ctor(gl_inst_opcode op,
       if (src1 != NULL) {
 	 inst->Base.SrcReg[1] = src1->Base;
 	 inst->SrcReg[1] = *src1;
+      } else {
+	 init_src_reg(& inst->SrcReg[1]);
       }
 
       if (src2 != NULL) {
 	 inst->Base.SrcReg[2] = src2->Base;
 	 inst->SrcReg[2] = *src2;
+      } else {
+	 init_src_reg(& inst->SrcReg[2]);
       }
    }