+ if (inst->DstReg.CondMask == COND_TR)
+ return BRW_PREDICATE_NONE;
+
+ /* All of GLSL only produces predicates for COND_NE and one channel per
+ * vector. Fail badly if someone starts doing something else, as it might
+ * mean infinite looping or something.
+ *
+ * We'd like to support all the condition codes, but our hardware doesn't
+ * quite match the Mesa IR, which is modeled after the NV extensions. For
+ * those, the instruction may update the condition codes or not, then any
+ * later instruction may use one of those condition codes. For gen4, the
+ * instruction may update the flags register based on one of the condition
+ * codes output by the instruction, and then further instructions may
+ * predicate on that. We can probably support this, but it won't
+ * necessarily be easy.
+ */
+ assert(inst->DstReg.CondMask == COND_NE);
+
+ switch (inst->DstReg.CondSwizzle) {