; RUN: opt -instcombine -S < %s | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:64"
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define i32 *@test1(i32* %A, i32 %Offset) {
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entry:
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%tmp = getelementptr inbounds i32, i32* %A, i32 %Offset
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br label %bb
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bb:
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%RHS = phi i32* [ %RHS.next, %bb ], [ %tmp, %entry ]
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%LHS = getelementptr inbounds i32, i32* %A, i32 100
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%RHS.next = getelementptr inbounds i32, i32* %RHS, i64 1
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%cond = icmp ult i32 * %LHS, %RHS
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br i1 %cond, label %bb2, label %bb
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bb2:
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ret i32* %RHS
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; CHECK-LABEL: @test1(
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; CHECK: %[[INDEX:[0-9A-Za-z.]+]] = phi i32 [ %[[ADD:[0-9A-Za-z.]+]], %bb ], [ %Offset, %entry ]
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; CHECK: %[[ADD]] = add nsw i32 %[[INDEX]], 1
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; CHECK: %cond = icmp sgt i32 %[[INDEX]], 100
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; CHECK: br i1 %cond, label %bb2, label %bb
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; CHECK: %[[PTR:[0-9A-Za-z.]+]] = getelementptr inbounds i32, i32* %A, i32 %[[INDEX]]
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; CHECK: ret i32* %[[PTR]]
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}
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define i32 *@test2(i32 %A, i32 %Offset) {
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entry:
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%A.ptr = inttoptr i32 %A to i32*
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%tmp = getelementptr inbounds i32, i32* %A.ptr, i32 %Offset
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br label %bb
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bb:
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%RHS = phi i32* [ %RHS.next, %bb ], [ %tmp, %entry ]
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%LHS = getelementptr inbounds i32, i32* %A.ptr, i32 100
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%RHS.next = getelementptr inbounds i32, i32* %RHS, i64 1
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%cmp0 = ptrtoint i32 *%LHS to i32
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%cmp1 = ptrtoint i32 *%RHS to i32
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%cond = icmp ult i32 %cmp0, %cmp1
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br i1 %cond, label %bb2, label %bb
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bb2:
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ret i32* %RHS
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; CHECK-LABEL: @test2(
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; CHECK: %[[INDEX:[0-9A-Za-z.]+]] = phi i32 [ %[[ADD:[0-9A-Za-z.]+]], %bb ], [ %Offset, %entry ]
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; CHECK: %[[ADD]] = add nsw i32 %[[INDEX]], 1
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; CHECK: %cond = icmp sgt i32 %[[INDEX]], 100
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; CHECK: br i1 %cond, label %bb2, label %bb
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; CHECK: %[[TOPTR:[0-9A-Za-z.]+]] = inttoptr i32 %[[ADD:[0-9A-Za-z.]+]] to i32*
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; CHECK: %[[PTR:[0-9A-Za-z.]+]] = getelementptr inbounds i32, i32* %[[TOPTR]], i32 %[[INDEX]]
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; CHECK: ret i32* %[[PTR]]
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}
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; Perform the transformation only if we know that the GEPs used are inbounds.
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define i32 *@test3(i32* %A, i32 %Offset) {
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entry:
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%tmp = getelementptr i32, i32* %A, i32 %Offset
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br label %bb
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bb:
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%RHS = phi i32* [ %RHS.next, %bb ], [ %tmp, %entry ]
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%LHS = getelementptr i32, i32* %A, i32 100
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%RHS.next = getelementptr i32, i32* %RHS, i64 1
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%cond = icmp ult i32 * %LHS, %RHS
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br i1 %cond, label %bb2, label %bb
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bb2:
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ret i32* %RHS
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; CHECK-LABEL: @test3(
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; CHECK-NOT: %cond = icmp sgt i32 %{{[0-9A-Za-z.]+}}, 100
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}
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; An inttoptr that requires an extension or truncation will be opaque when determining
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; the base pointer. In this case we can still perform the transformation by considering
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; A.ptr as being the base pointer.
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define i32 *@test4(i16 %A, i32 %Offset) {
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entry:
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%A.ptr = inttoptr i16 %A to i32*
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%tmp = getelementptr inbounds i32, i32* %A.ptr, i32 %Offset
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br label %bb
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bb:
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%RHS = phi i32* [ %RHS.next, %bb ], [ %tmp, %entry ]
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%LHS = getelementptr inbounds i32, i32* %A.ptr, i32 100
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%RHS.next = getelementptr inbounds i32, i32* %RHS, i64 1
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%cmp0 = ptrtoint i32 *%LHS to i32
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%cmp1 = ptrtoint i32 *%RHS to i32
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%cond = icmp ult i32 %cmp0, %cmp1
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br i1 %cond, label %bb2, label %bb
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bb2:
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ret i32* %RHS
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; CHECK-LABEL: @test4(
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; CHECK: %cond = icmp sgt i32 %{{[0-9A-Za-z.]+}}, 100
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}
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declare i32* @fun_ptr()
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define i32 *@test5(i32 %Offset) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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%A = invoke i32 *@fun_ptr() to label %cont unwind label %lpad
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cont:
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%tmp = getelementptr inbounds i32, i32* %A, i32 %Offset
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br label %bb
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bb:
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%RHS = phi i32* [ %RHS.next, %bb ], [ %tmp, %cont ]
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%LHS = getelementptr inbounds i32, i32* %A, i32 100
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%RHS.next = getelementptr inbounds i32, i32* %RHS, i64 1
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%cond = icmp ult i32 * %LHS, %RHS
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br i1 %cond, label %bb2, label %bb
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bb2:
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ret i32* %RHS
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lpad:
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%l = landingpad { i8*, i32 } cleanup
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ret i32* null
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; CHECK-LABEL: @test5(
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; CHECK: %[[INDEX:[0-9A-Za-z.]+]] = phi i32 [ %[[ADD:[0-9A-Za-z.]+]], %bb ], [ %Offset, %cont ]
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; CHECK: %[[ADD]] = add nsw i32 %[[INDEX]], 1
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; CHECK: %cond = icmp sgt i32 %[[INDEX]], 100
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; CHECK: br i1 %cond, label %bb2, label %bb
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; CHECK: %[[PTR:[0-9A-Za-z.]+]] = getelementptr inbounds i32, i32* %A, i32 %[[INDEX]]
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; CHECK: ret i32* %[[PTR]]
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}
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declare i32 @fun_i32()
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define i32 *@test6(i32 %Offset) personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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%A = invoke i32 @fun_i32() to label %cont unwind label %lpad
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cont:
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%A.ptr = inttoptr i32 %A to i32*
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%tmp = getelementptr inbounds i32, i32* %A.ptr, i32 %Offset
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br label %bb
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bb:
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%RHS = phi i32* [ %RHS.next, %bb ], [ %tmp, %cont ]
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%LHS = getelementptr inbounds i32, i32* %A.ptr, i32 100
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%RHS.next = getelementptr inbounds i32, i32* %RHS, i64 1
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%cond = icmp ult i32 * %LHS, %RHS
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br i1 %cond, label %bb2, label %bb
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bb2:
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ret i32* %RHS
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lpad:
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%l = landingpad { i8*, i32 } cleanup
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ret i32* null
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; CHECK-LABEL: @test6(
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; CHECK: %[[INDEX:[0-9A-Za-z.]+]] = phi i32 [ %[[ADD:[0-9A-Za-z.]+]], %bb ], [ %Offset, %cont ]
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; CHECK: %[[ADD]] = add nsw i32 %[[INDEX]], 1
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; CHECK: %cond = icmp sgt i32 %[[INDEX]], 100
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; CHECK: br i1 %cond, label %bb2, label %bb
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; CHECK: %[[TOPTR:[0-9A-Za-z.]+]] = inttoptr i32 %[[ADD:[0-9A-Za-z.]+]] to i32*
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; CHECK: %[[PTR:[0-9A-Za-z.]+]] = getelementptr inbounds i32, i32* %[[TOPTR]], i32 %[[INDEX]]
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; CHECK: ret i32* %[[PTR]]
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}
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declare i32 @__gxx_personality_v0(...)
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