test/Analysis/BasicAA/modref.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -basic-aa -gvn -dse -S | FileCheck %s
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"

declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)

declare void @external(i32*)

define i32 @test0(i8* %P) {
; CHECK-LABEL: @test0(
; CHECK-NEXT:    [[A:%.*]] = alloca i32, align 4
; CHECK-NEXT:    call void @external(i32* [[A]])
; CHECK-NEXT:    call void @llvm.memset.p0i8.i32(i8* [[P:%.*]], i8 0, i32 42, i1 false)
; CHECK-NEXT:    ret i32 0
;
  %A = alloca i32
  call void @external(i32* %A)

  store i32 0, i32* %A

  call void @llvm.memset.p0i8.i32(i8* %P, i8 0, i32 42, i1 false)

  %B = load i32, i32* %A
  ret i32 %B
}

define i8 @test1() {
; CHECK-LABEL: @test1(
; CHECK-NEXT:    ret i8 2
;
  %A = alloca i8
  %B = alloca i8

  store i8 2, i8* %B  ;; Not written to by memcpy

  call void @llvm.memcpy.p0i8.p0i8.i8(i8* %A, i8* %B, i8 -1, i1 false)

  %C = load i8, i8* %B
  ret i8 %C
}

define i8 @test2(i8* %P) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:    [[P2:%.*]] = getelementptr i8, i8* [[P:%.*]], i32 127
; CHECK-NEXT:    store i8 1, i8* [[P2]], align 1
; CHECK-NEXT:    call void @llvm.memset.p0i8.i8(i8* [[P]], i8 2, i8 127, i1 false)
; CHECK-NEXT:    ret i8 1
;
  %P2 = getelementptr i8, i8* %P, i32 127
  store i8 1, i8* %P2  ;; Not dead across memset
  call void @llvm.memset.p0i8.i8(i8* %P, i8 2, i8 127, i1 false)
  %A = load i8, i8* %P2
  ret i8 %A
}

define i8 @test2a(i8* %P) {
; CHECK-LABEL: @test2a(
; CHECK-NEXT:    call void @llvm.memset.p0i8.i8(i8* [[P:%.*]], i8 2, i8 127, i1 false)
; CHECK-NEXT:    ret i8 2
;
  %P2 = getelementptr i8, i8* %P, i32 126

  store i8 1, i8* %P2  ;; Dead, clobbered by memset.

  call void @llvm.memset.p0i8.i8(i8* %P, i8 2, i8 127, i1 false)
  %A = load i8, i8* %P2
  ret i8 %A
}

define void @test3(i8* %P, i8 %X) {
; CHECK-LABEL: @test3(
; CHECK-NEXT:    [[P2:%.*]] = getelementptr i8, i8* [[P:%.*]], i32 2
; CHECK-NEXT:    call void @llvm.lifetime.end.p0i8(i64 1, i8* [[P]])
; CHECK-NEXT:    store i8 2, i8* [[P2]], align 1
; CHECK-NEXT:    ret void
;
  %Y = add i8 %X, 1     ;; Dead, because the only use (the store) is dead.

  %P2 = getelementptr i8, i8* %P, i32 2
  store i8 %Y, i8* %P2  ;; Not read by lifetime.end, should be removed.
  call void @llvm.lifetime.end.p0i8(i64 1, i8* %P)
  store i8 2, i8* %P2
  ret void
}

define void @test3a(i8* %P, i8 %X) {
; CHECK-LABEL: @test3a(
; CHECK-NEXT:    call void @llvm.lifetime.end.p0i8(i64 10, i8* [[P:%.*]])
; CHECK-NEXT:    ret void
;
  %Y = add i8 %X, 1     ;; Dead, because the only use (the store) is dead.

  %P2 = getelementptr i8, i8* %P, i32 2
  store i8 %Y, i8* %P2
  call void @llvm.lifetime.end.p0i8(i64 10, i8* %P)
  ret void
}

@G1 = external global i32
@G2 = external global [4000 x i32]

define i32 @test4(i8* %P) {
; CHECK-LABEL: @test4(
; CHECK-NEXT:    call void @llvm.memset.p0i8.i32(i8* bitcast ([4000 x i32]* @G2 to i8*), i8 0, i32 4000, i1 false)
; CHECK-NEXT:    ret i32 0
;
  %tmp = load i32, i32* @G1
  call void @llvm.memset.p0i8.i32(i8* bitcast ([4000 x i32]* @G2 to i8*), i8 0, i32 4000, i1 false)
  %tmp2 = load i32, i32* @G1
  %sub = sub i32 %tmp2, %tmp
  ret i32 %sub
}

; Verify that basicaa is handling variable length memcpy, knowing it doesn't
; write to G1.
define i32 @test5(i8* %P, i32 %Len) {
; CHECK-LABEL: @test5(
; CHECK-NEXT:    call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast ([4000 x i32]* @G2 to i8*), i8* bitcast (i32* @G1 to i8*), i32 [[LEN:%.*]], i1 false)
; CHECK-NEXT:    ret i32 0
;
  %tmp = load i32, i32* @G1
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast ([4000 x i32]* @G2 to i8*), i8* bitcast (i32* @G1 to i8*), i32 %Len, i1 false)
  %tmp2 = load i32, i32* @G1
  %sub = sub i32 %tmp2, %tmp
  ret i32 %sub
}

define i8 @test6(i8* %p, i8* noalias %a) {
; CHECK-LABEL: @test6(
; CHECK-NEXT:    [[X:%.*]] = load i8, i8* [[A:%.*]], align 1
; CHECK-NEXT:    [[T:%.*]] = va_arg i8* [[P:%.*]], float
; CHECK-NEXT:    [[Z:%.*]] = add i8 [[X]], [[X]]
; CHECK-NEXT:    ret i8 [[Z]]
;
  %x = load i8, i8* %a
  %t = va_arg i8* %p, float
  %y = load i8, i8* %a
  %z = add i8 %x, %y
  ret i8 %z
}

; PR10628
declare void @test7decl(i32* nocapture %x)
define i32 @test7() nounwind uwtable ssp {
; CHECK-LABEL: @test7(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[X:%.*]] = alloca i32, align 4
; CHECK-NEXT:    store i32 0, i32* [[X]], align 4
; CHECK-NEXT:    [[ADD_PTR:%.*]] = getelementptr inbounds i32, i32* [[X]], i64 1
; CHECK-NEXT:    call void @test7decl(i32* [[ADD_PTR]])
; CHECK-NEXT:    [[TMP:%.*]] = load i32, i32* [[X]], align 4
; CHECK-NEXT:    ret i32 [[TMP]]
;
entry:
  %x = alloca i32, align 4
  store i32 0, i32* %x, align 4
  %add.ptr = getelementptr inbounds i32, i32* %x, i64 1
  call void @test7decl(i32* %add.ptr)
  %tmp = load i32, i32* %x, align 4
  ret i32 %tmp
}

;; Check that aa correctly handles functions marked with argmemonly
;; attribute.
declare i32 @func_argmemonly(i32 * %P) argmemonly

;; Can not remove redundant load, function may write to it.

define i32 @test8(i32 *%P) {
; CHECK-LABEL: @test8(
; CHECK-NEXT:    [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @func_argmemonly(i32* [[P]])
; CHECK-NEXT:    [[V2:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT:    [[DIFF:%.*]] = sub i32 [[V1]], [[V2]]
; CHECK-NEXT:    ret i32 [[DIFF]]
;
  %V1 = load i32, i32* %P
  call i32 @func_argmemonly(i32* %P)
  %V2 = load i32, i32* %P
  %Diff = sub i32 %V1, %V2
  ret i32 %Diff
}

;; In this case load can be removed, function clobbers only %P2.
define i32 @test9(i32* %P, i32* noalias %P2) {
; CHECK-LABEL: @test9(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @func_argmemonly(i32* [[P2:%.*]])
; CHECK-NEXT:    ret i32 0
;
  %V1 = load i32, i32* %P
  call i32 @func_argmemonly(i32* %P2)
  %V2 = load i32, i32* %P
  %Diff = sub i32 %V1, %V2
  ret i32 %Diff
}

;; In this case load can *not* be removed. Function clobers only %P2 but it may
;; alias with %P.
define i32 @test10(i32* %P, i32* %P2) {
; CHECK-LABEL: @test10(
; CHECK-NEXT:    [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @func_argmemonly(i32* [[P2:%.*]])
; CHECK-NEXT:    [[V2:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT:    [[DIFF:%.*]] = sub i32 [[V1]], [[V2]]
; CHECK-NEXT:    ret i32 [[DIFF]]
;
  %V1 = load i32, i32* %P
  call i32 @func_argmemonly(i32* %P2)
  %V2 = load i32, i32* %P
  %Diff = sub i32 %V1, %V2
  ret i32 %Diff
}

define i32 @test11(i32* %P, i32* %P2) {
; CHECK-LABEL: @test11(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @func_argmemonly(i32* readonly [[P2:%.*]])
; CHECK-NEXT:    ret i32 0
;
  %V1 = load i32, i32* %P
  call i32 @func_argmemonly(i32* readonly %P2)
  %V2 = load i32, i32* %P
  %Diff = sub i32 %V1, %V2
  ret i32 %Diff

}

declare i32 @func_argmemonly_two_args(i32* %P, i32* %P2) argmemonly

define i32 @test12(i32* %P, i32* %P2, i32* %P3) {
; CHECK-LABEL: @test12(
; CHECK-NEXT:    [[V1:%.*]] = load i32, i32* [[P:%.*]], align 4
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @func_argmemonly_two_args(i32* readonly [[P2:%.*]], i32* [[P3:%.*]])
; CHECK-NEXT:    [[V2:%.*]] = load i32, i32* [[P]], align 4
; CHECK-NEXT:    [[DIFF:%.*]] = sub i32 [[V1]], [[V2]]
; CHECK-NEXT:    ret i32 [[DIFF]]
;
  %V1 = load i32, i32* %P
  call i32 @func_argmemonly_two_args(i32* readonly %P2, i32* %P3)
  %V2 = load i32, i32* %P
  %Diff = sub i32 %V1, %V2
  ret i32 %Diff
}

define i32 @test13(i32* %P, i32* %P2) {
; CHECK-LABEL: @test13(
; CHECK-NEXT:    [[TMP1:%.*]] = call i32 @func_argmemonly(i32* readnone [[P2:%.*]])
; CHECK-NEXT:    ret i32 0
;
  %V1 = load i32, i32* %P
  call i32 @func_argmemonly(i32* readnone %P2)
  %V2 = load i32, i32* %P
  %Diff = sub i32 %V1, %V2
  ret i32 %Diff
}

declare void @llvm.memset.p0i8.i32(i8* nocapture, i8, i32, i1) nounwind
declare void @llvm.memset.p0i8.i8(i8* nocapture, i8, i8, i1) nounwind
declare void @llvm.memcpy.p0i8.p0i8.i8(i8* nocapture, i8* nocapture, i8, i1) nounwind
declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i1) nounwind