[EraVM] Add pre-commit test for xor optimization bug

Signed-off-by: Vladimir Radosavljevic <[email protected]>

llvm/test/CodeGen/EraVM/xor-opt-bug.ll

@@ -0,0 +1,18 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -O3 < %s | FileCheck %s
+
+target datalayout = "E-p:256:256-i256:256:256-S32-a:256:256"
+target triple = "eravm"
+
+define i256 @test(i256 %a) {
+; CHECK-LABEL: test:
+; CHECK:       ; %bb.0:
+; CHECK-NEXT:    sub! r1, r0, r1
+; CHECK-NEXT:    add 0, r0, r1
+; CHECK-NEXT:    add.eq 1, r0, r1
+; CHECK-NEXT:    ret
+  %cmp = icmp ne i256 %a, 0
+  %zext = zext i1 %cmp to i256
+  %xor = xor i256 %zext, -1
+  ret i256 %xor
+}