[InstCombine] Add icmp gep tests without inbounds (NFC)

Author: nikic

llvm/test/Transforms/InstCombine/icmp-gep.ll

@@ -284,6 +284,32 @@ define i1 @test60(ptr %foo, i64 %i, i64 %j) {
   ret i1 %cmp
 }
 
+define i1 @test_gep_ult_no_inbounds(ptr %foo, i64 %i, i64 %j) {
+; CHECK-LABEL: @test_gep_ult_no_inbounds(
+; CHECK-NEXT:    [[GEP1:%.*]] = getelementptr i32, ptr [[FOO:%.*]], i64 [[I:%.*]]
+; CHECK-NEXT:    [[GEP2:%.*]] = getelementptr i8, ptr [[FOO]], i64 [[J:%.*]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ult ptr [[GEP1]], [[GEP2]]
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %gep1 = getelementptr i32, ptr %foo, i64 %i
+  %gep2 = getelementptr i8, ptr %foo, i64 %j
+  %cmp = icmp ult ptr %gep1, %gep2
+  ret i1 %cmp
+}
+
+define i1 @test_gep_eq_no_inbounds(ptr %foo, i64 %i, i64 %j) {
+; CHECK-LABEL: @test_gep_eq_no_inbounds(
+; CHECK-NEXT:    [[GEP1:%.*]] = getelementptr i32, ptr [[FOO:%.*]], i64 [[I:%.*]]
+; CHECK-NEXT:    [[GEP2:%.*]] = getelementptr i8, ptr [[FOO]], i64 [[J:%.*]]
+; CHECK-NEXT:    [[CMP:%.*]] = icmp eq ptr [[GEP1]], [[GEP2]]
+; CHECK-NEXT:    ret i1 [[CMP]]
+;
+  %gep1 = getelementptr i32, ptr %foo, i64 %i
+  %gep2 = getelementptr i8, ptr %foo, i64 %j
+  %cmp = icmp eq ptr %gep1, %gep2
+  ret i1 %cmp
+}
+
 define i1 @test60_as1(ptr addrspace(1) %foo, i64 %i, i64 %j) {
 ; CHECK-LABEL: @test60_as1(
 ; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[I:%.*]] to i16