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path: root/src/mesa/program/prog_optimize.c
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-rw-r--r--src/mesa/program/prog_optimize.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/mesa/program/prog_optimize.c b/src/mesa/program/prog_optimize.c
index 8a40fa69eca..f4a7a638d5f 100644
--- a/src/mesa/program/prog_optimize.c
+++ b/src/mesa/program/prog_optimize.c
@@ -1319,6 +1319,15 @@ _mesa_simplify_cmp(struct gl_program * program)
inst->Opcode = OPCODE_MOV;
inst->SrcReg[0] = inst->SrcReg[1];
+
+ /* Unused operands are expected to have the file set to
+ * PROGRAM_UNDEFINED. This is how _mesa_init_instructions initializes
+ * all of the sources.
+ */
+ inst->SrcReg[1].File = PROGRAM_UNDEFINED;
+ inst->SrcReg[1].Swizzle = SWIZZLE_NOOP;
+ inst->SrcReg[2].File = PROGRAM_UNDEFINED;
+ inst->SrcReg[2].Swizzle = SWIZZLE_NOOP;
}
}
if (dbg) {