--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -S -passes="separate-const-offset-from-gep<lower-gep>" < %s | FileCheck %s
+
+; Check that GEP with an index 'A - B + [ConstantInt]' will be split into two
+; GEPs. eg.
+; %A = ...
+; %B = ...
+; %sub = %A - %B
+; %idx = %sub + 10
+; %gep = getelementptr int, ptr %p, %idx
+; will be transformed into:
+; %A = ...
+; %B = ...
+; %sub = %A - %B
+; %gep_base = getelementptr int, ptr %p, %sub
+; %gep = getelementptr int, ptr %gep_base, 10
+
+define void @test_A_sub_B_add_ConstantInt(ptr %p) {
+; CHECK-LABEL: @test_A_sub_B_add_ConstantInt(
+; CHECK-NEXT: entry:
+; CHECK-NEXT: [[TMP0:%.*]] = tail call i32 @foo()
+; CHECK-NEXT: [[REM:%.*]] = srem i32 [[TMP0]], 5
+; CHECK-NEXT: br label [[FOR_BODY:%.*]]
+; CHECK: for.body:
+; CHECK-NEXT: [[K:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[COND_END:%.*]] ]
+; CHECK-NEXT: [[MUL:%.*]] = mul nuw nsw i32 [[K]], 5
+; CHECK-NEXT: [[SUB1:%.*]] = sub nsw i32 [[MUL]], [[REM]]
+; CHECK-NEXT: [[CMP26:%.*]] = icmp ult i32 [[SUB1]], 512
+; CHECK-NEXT: br i1 [[CMP26]], label [[COND_TRUE:%.*]], label [[COND_END]]
+; CHECK: cond.true:
+; CHECK-NEXT: [[SUB22:%.*]] = sext i32 [[SUB1]] to i64
+; CHECK-NEXT: [[TMP1:%.*]] = ptrtoint ptr [[P:%.*]] to i64
+; CHECK-NEXT: [[TMP2:%.*]] = shl i64 [[SUB22]], 2
+; CHECK-NEXT: [[TMP3:%.*]] = add i64 [[TMP1]], [[TMP2]]
+; CHECK-NEXT: [[TMP4:%.*]] = add i64 [[TMP3]], 2044
+; CHECK-NEXT: [[TMP5:%.*]] = inttoptr i64 [[TMP4]] to ptr
+; CHECK-NEXT: store float 1.000000e+00, ptr [[TMP5]], align 4
+; CHECK-NEXT: br label [[COND_END]]
+; CHECK: cond.end:
+; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[K]], 1
+; CHECK-NEXT: [[EXITCOND:%.*]] = icmp ne i32 [[INC]], 100
+; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_BODY]], label [[FOR_END:%.*]]
+; CHECK: for.end:
+; CHECK-NEXT: ret void
+;
+entry:
+ %0 = tail call i32 @foo()
+ %rem = srem i32 %0, 5
+ %add = add nsw i32 %rem , 511
+ br label %for.body
+
+for.body:
+ %k = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
+ %mul = mul nuw nsw i32 %k, 5
+ %sub1 = sub nsw i32 %mul, %rem
+ %cmp26 = icmp ult i32 %sub1, 512
+ br i1 %cmp26, label %cond.true, label %cond.end
+
+cond.true:
+ %sub2 = sub nsw i32 %add, %mul
+ %idxprom = sext i32 %sub2 to i64
+ %arryidx = getelementptr inbounds float, ptr %p, i64 %idxprom
+ store float 1.0, ptr %arryidx, align 4
+ br label %cond.end
+
+cond.end:
+ %inc = add nuw nsw i32 %k, 1
+ %exitcond = icmp ne i32 %inc, 100
+ br i1 %exitcond, label %for.body, label %for.end
+
+for.end:
+ ret void
+}
+
+declare i32 @foo()