gpu: jit: invert cmp instructions when required

Author: kealan-barbieri

src/gpu/jit/codegen/codegen.hpp

@@ -1,5 +1,5 @@
 /*******************************************************************************
-* Copyright 2022 Intel Corporation
+* Copyright 2022-2023 Intel Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
@@ -1072,9 +1072,15 @@ class expr_evaluator_t : public ir_visitor_t {
             case op_kind_t::_ne: {
                 ir_assert(!dst.is_negated()) << "Destination can't be negated.";
                 ngen::InstructionModifier cmp_mod = mod;
-                cmp_mod |= cmp_op_to_ngen(obj.op_kind);
-                cmp_mod |= dst.flag_register();
-                host_->ecmp(cmp_mod, src0, src1);
+                if (!src0.is_reg_data()) {
+                    cmp_mod |= cmp_op_to_ngen(negate_cmp_op(obj.op_kind));
+                    cmp_mod |= dst.flag_register();
+                    host_->ecmp(cmp_mod, src1, src0);
+                } else {
+                    cmp_mod |= cmp_op_to_ngen(obj.op_kind);
+                    cmp_mod |= dst.flag_register();
+                    host_->ecmp(cmp_mod, src0, src1);
+                }
                 break;
             }
             case op_kind_t::_and: host_->eand(mod, dst, src0, src1); break;