+static void transform_r300_vertex_CMP(struct radeon_compiler* c,
+ struct rc_instruction* inst)
+{
+ /* There is no decent CMP available, so let's rig one up.
+ * CMP is defined as dst = src0 < 0.0 ? src1 : src2
+ * The following sequence consumes two temps and two extra slots
+ * (the second temp and the second slot is consumed by transform_LRP),
+ * but should be equivalent:
+ *
+ * SLT tmp0, src0, 0.0
+ * LRP dst, tmp0, src1, src2
+ *
+ * Yes, I know, I'm a mad scientist. ~ C. & M. */
+ int tempreg0 = rc_find_free_temporary(c);
+
+ /* SLT tmp0, src0, 0.0 */
+ emit2(c, inst->Prev, RC_OPCODE_SLT, 0,
+ dstreg(RC_FILE_TEMPORARY, tempreg0),
+ inst->U.I.SrcReg[0], builtin_zero);
+
+ /* LRP dst, tmp0, src1, src2 */
+ transform_LRP(c,
+ emit3(c, inst->Prev, RC_OPCODE_LRP, 0,
+ inst->U.I.DstReg,
+ srcreg(RC_FILE_TEMPORARY, tempreg0), inst->U.I.SrcReg[1], inst->U.I.SrcReg[2]));
+
+ rc_remove_instruction(inst);
+}
+