src/third_party/llvm-project/llvm/test/Transforms/CorrelatedValuePropagation/non-null.ll

; RUN: opt < %s -correlated-propagation -S | FileCheck %s

define void @test1(i8* %ptr) {
; CHECK: test1
  %A = load i8, i8* %ptr
  br label %bb
bb:
  icmp ne i8* %ptr, null
; CHECK-NOT: icmp
  ret void
}

define void @test1_no_null_opt(i8* %ptr) #0 {
; CHECK: test1_no_null_opt
  %A = load i8, i8* %ptr
  br label %bb
bb:
  icmp ne i8* %ptr, null
; CHECK: icmp ne i8* %ptr, null
  ret void
}

define void @test2(i8* %ptr) {
; CHECK: test2
  store i8 0, i8* %ptr
  br label %bb
bb:
  icmp ne i8* %ptr, null
; CHECK-NOT: icmp
  ret void
}

define void @test2_no_null_opt(i8* %ptr) #0 {
; CHECK: test2_no_null_opt
  store i8 0, i8* %ptr
  br label %bb
bb:
  icmp ne i8* %ptr, null
; CHECK: icmp ne i8* %ptr, null
  ret void
}

define void @test3() {
; CHECK: test3
  %ptr = alloca i8
  br label %bb
bb:
  icmp ne i8* %ptr, null
; CHECK-NOT: icmp
  ret void
}

;; OK to remove icmp here since ptr is coming from alloca.
define void @test3_no_null_opt() #0 {
; CHECK: test3
  %ptr = alloca i8
  br label %bb
bb:
  icmp ne i8* %ptr, null
; CHECK-NOT: icmp
  ret void
}

declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i1)
define void @test4(i8* %dest, i8* %src) {
; CHECK: test4
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 1, i1 false)
  br label %bb
bb:
  icmp ne i8* %dest, null
  icmp ne i8* %src, null
; CHECK-NOT: icmp
  ret void
}

define void @test4_no_null_opt(i8* %dest, i8* %src) #0 {
; CHECK: test4_no_null_opt
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 1, i1 false)
  br label %bb
bb:
  icmp ne i8* %dest, null
  icmp ne i8* %src, null
; CHECK: icmp ne i8* %dest, null
; CHECK: icmp ne i8* %src, null
  ret void
}

declare void @llvm.memmove.p0i8.p0i8.i32(i8*, i8*, i32, i1)
define void @test5(i8* %dest, i8* %src) {
; CHECK: test5
  call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 1, i1 false)
  br label %bb
bb:
  icmp ne i8* %dest, null
  icmp ne i8* %src, null
; CHECK-NOT: icmp
  ret void
}

define void @test5_no_null_opt(i8* %dest, i8* %src) #0 {
; CHECK: test5_no_null_opt
  call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 1, i1 false)
  br label %bb
bb:
  icmp ne i8* %dest, null
  icmp ne i8* %src, null
; CHECK: icmp ne i8* %dest, null
; CHECK: icmp ne i8* %src, null
  ret void
}

declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i1)
define void @test6(i8* %dest) {
; CHECK: test6
  call void @llvm.memset.p0i8.i32(i8* %dest, i8 255, i32 1, i1 false)
  br label %bb
bb:
  icmp ne i8* %dest, null
; CHECK-NOT: icmp
  ret void
}

define void @test6_no_null_opt(i8* %dest) #0 {
; CHECK: test6_no_null_opt
  call void @llvm.memset.p0i8.i32(i8* %dest, i8 255, i32 1, i1 false)
  br label %bb
bb:
  icmp ne i8* %dest, null
; CHECK: icmp ne i8* %dest, null
  ret void
}

define void @test7(i8* %dest, i8* %src, i32 %len) {
; CHECK: test7
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 %len, i1 false)
  br label %bb
bb:
  %KEEP1 = icmp ne i8* %dest, null
; CHECK: KEEP1
  %KEEP2 = icmp ne i8* %src, null
; CHECK: KEEP2
  ret void
}

declare void @llvm.memcpy.p1i8.p1i8.i32(i8 addrspace(1) *, i8 addrspace(1) *, i32, i1)
define void @test8(i8 addrspace(1) * %dest, i8 addrspace(1) * %src) {
; CHECK: test8
  call void @llvm.memcpy.p1i8.p1i8.i32(i8 addrspace(1) * %dest, i8 addrspace(1) * %src, i32 1, i1 false)
  br label %bb
bb:
  %KEEP1 = icmp ne i8 addrspace(1) * %dest, null
; CHECK: KEEP1
  %KEEP2 = icmp ne i8 addrspace(1) * %src, null
; CHECK: KEEP2
  ret void
}

define void @test9(i8* %dest, i8* %src) {
; CHECK: test9
  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 1, i1 true)
  br label %bb
bb:
  %KEEP1 = icmp ne i8* %dest, null
; CHECK: KEEP1
  %KEEP2 = icmp ne i8* %src, null
; CHECK: KEEP2
  ret void
}

declare void @test10_helper(i8* %arg1, i8* %arg2, i32 %non-pointer-arg)
define void @test10(i8* %arg1, i8* %arg2, i32 %non-pointer-arg) {
; CHECK-LABEL: @test10
entry:
  %is_null = icmp eq i8* %arg1, null
  br i1 %is_null, label %null, label %non_null

non_null:
  call void @test10_helper(i8* %arg1, i8* %arg2, i32 %non-pointer-arg)
  ; CHECK: call void @test10_helper(i8* nonnull %arg1, i8* %arg2, i32 %non-pointer-arg)
  br label %null

null:
  call void @test10_helper(i8* %arg1, i8* %arg2, i32 %non-pointer-arg)
  ; CHECK: call void @test10_helper(i8* %arg1, i8* %arg2, i32 %non-pointer-arg)
  ret void
}

declare void @test11_helper(i8* %arg)
define void @test11(i8* %arg1, i8** %arg2) {
; CHECK-LABEL: @test11
entry:
  %is_null = icmp eq i8* %arg1, null
  br i1 %is_null, label %null, label %non_null

non_null:
  br label %merge

null:
  %another_arg = alloca i8
  br label %merge

merge:
  %merged_arg = phi i8* [%another_arg, %null], [%arg1, %non_null]
  call void @test11_helper(i8* %merged_arg)
  ; CHECK: call void @test11_helper(i8* nonnull %merged_arg)
  ret void
}

declare void @test12_helper(i8* %arg)
define void @test12(i8* %arg1, i8** %arg2) {
; CHECK-LABEL: @test12
entry:
  %is_null = icmp eq i8* %arg1, null
  br i1 %is_null, label %null, label %non_null

non_null:
  br label %merge

null:
  %another_arg = load i8*, i8** %arg2, !nonnull !{}
  br label %merge

merge:
  %merged_arg = phi i8* [%another_arg, %null], [%arg1, %non_null]
  call void @test12_helper(i8* %merged_arg)
  ; CHECK: call void @test12_helper(i8* nonnull %merged_arg)
  ret void
}

attributes #0 = { "null-pointer-is-valid"="true" }