Add testcase passing on main

Author: linuxrocks123

llvm/test/CodeGen/AMDGPU/redundant-cmp-reg-sequence.ll

@@ -0,0 +1,23 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
+; RUN: llc -mtriple=amdgcn -mcpu=gfx900 < %s | FileCheck %s
+define amdgpu_ps i64 @ordertest(i64 inreg %val0) {
+; CHECK-LABEL: ordertest:
+; CHECK:       ; %bb.0:
+; CHECK-NEXT:    s_lshr_b32 s0, s1, 2
+; CHECK-NEXT:    s_mov_b32 s1, 0
+; CHECK-NEXT:    s_cmp_lg_u64 s[0:1], 0
+; CHECK-NEXT:    s_cselect_b64 s[2:3], -1, 0
+; CHECK-NEXT:    v_cndmask_b32_e64 v2, 0, 1, s[2:3]
+; CHECK-NEXT:    v_lshrrev_b64 v[0:1], v2, s[0:1]
+; CHECK-NEXT:    v_xor_b32_e32 v0, v2, v0
+; CHECK-NEXT:    v_readfirstlane_b32 s0, v0
+; CHECK-NEXT:    ; return to shader part epilog
+  %shl = lshr i64 %val0, 34
+  %result = and i64 %shl, 4294967295
+  %cmp = icmp ne i64 %result, 0
+  %zext = zext i1 %cmp to i64
+  %param0 = lshr i64 %shl, %zext
+  %param = and i64 %param0, 4294967295
+  %xory = xor i64 %zext, %param
+  ret i64 %xory
+}