test/Transforms/DeadStoreElimination/libcalls.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -aa-pipeline=basic-aa -passes=inferattrs,dse | FileCheck %s

target triple = "x86_64-unknown-linux-gnu"

declare ptr @strcpy(ptr %dest, ptr %src) nounwind
define void @test1(ptr %src) {
; CHECK-LABEL: @test1(
; CHECK-NEXT:    ret void
;
  %B = alloca [16 x i8]
  %call = call ptr @strcpy(ptr %B, ptr %src)
  ret void
}

define void @strcpy_reads_after(ptr noalias %dest, ptr %src) {
; CHECK-LABEL: @strcpy_reads_after(
; CHECK-NEXT:    [[SRC_2:%.*]] = getelementptr inbounds i8, ptr [[SRC:%.*]], i64 1
; CHECK-NEXT:    store i8 99, ptr [[SRC_2]], align 1
; CHECK-NEXT:    [[SRC_1:%.*]] = getelementptr inbounds i8, ptr [[SRC]], i64 1
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @strcpy(ptr [[DEST:%.*]], ptr [[SRC_1]])
; CHECK-NEXT:    store i8 2, ptr [[SRC]], align 1
; CHECK-NEXT:    store i8 2, ptr [[SRC_2]], align 1
; CHECK-NEXT:    ret void
;
  %src.2 = getelementptr inbounds i8, ptr %src, i64 1
  store i8 1, ptr %src
  store i8 99, ptr %src.2
  %src.1 = getelementptr inbounds i8, ptr %src, i64 1
  %call = call ptr @strcpy(ptr %dest, ptr %src.1)
  store i8 2, ptr %src
  store i8 2, ptr %src.2
  ret void
}

declare ptr @strncpy(ptr %dest, ptr %src, i64 %n) nounwind
define void @test2(ptr %src) {
; CHECK-LABEL: @test2(
; CHECK-NEXT:    ret void
;
  %B = alloca [16 x i8]
  %call = call ptr @strncpy(ptr %B, ptr %src, i64 12)
  ret void
}

declare ptr @strcat(ptr %B, ptr %src) nounwind
define void @test3(ptr %src) {
; CHECK-LABEL: @test3(
; CHECK-NEXT:    ret void
;
  %B = alloca [16 x i8]
  %call = call ptr @strcat(ptr %B, ptr %src)
  ret void
}

define void @test_strcat_with_lifetime(ptr %src) {
; CHECK-LABEL: @test_strcat_with_lifetime(
; CHECK-NEXT:    [[B:%.*]] = alloca [16 x i8], align 1
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 16, ptr nonnull [[B]])
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(i64 16, ptr nonnull [[B]])
; CHECK-NEXT:    ret void
;
  %B = alloca [16 x i8]
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %B)
  %call = call ptr @strcat(ptr %B, ptr %src)
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %B)
  ret void
}

define void @test_strcat_with_lifetime_nonlocal(ptr %dest, ptr %src) {
; CHECK-LABEL: @test_strcat_with_lifetime_nonlocal(
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 16, ptr nonnull [[DEST:%.*]])
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @strcat(ptr [[DEST]], ptr [[SRC:%.*]])
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(i64 16, ptr nonnull [[DEST]])
; CHECK-NEXT:    ret void
;
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %dest)
  %call = call ptr @strcat(ptr %dest, ptr %src)
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %dest)
  ret void
}

declare ptr @strncat(ptr %dest, ptr %src, i64 %n) nounwind
define void @test4(ptr %src) {
; CHECK-LABEL: @test4(
; CHECK-NEXT:    ret void
;
  %B = alloca [16 x i8]
  %call = call ptr @strncat(ptr %B, ptr %src, i64 12)
  ret void
}

define void @test5(ptr nocapture %src) {
; CHECK-LABEL: @test5(
; CHECK-NEXT:    ret void
;
  %dest = alloca [100 x i8], align 16
  %call = call ptr @strcpy(ptr %dest, ptr %src)
  %arrayidx = getelementptr inbounds i8, ptr %call, i64 10
  store i8 97, ptr %arrayidx, align 1
  ret void
}

declare void @user(ptr %p)
define void @test6(ptr %src) {
; CHECK-LABEL: @test6(
; CHECK-NEXT:    [[B:%.*]] = alloca [16 x i8], align 1
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @strcpy(ptr [[B]], ptr [[SRC:%.*]])
; CHECK-NEXT:    call void @user(ptr [[B]])
; CHECK-NEXT:    ret void
;
  %B = alloca [16 x i8]
  %call = call ptr @strcpy(ptr %B, ptr %src)
  call void @user(ptr %B)
  ret void
}

declare i32 @memcmp(ptr, ptr, i64)

define i32 @test_memcmp_const_size(ptr noalias %foo) {
; CHECK-LABEL: @test_memcmp_const_size(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STACK:%.*]] = alloca [10 x i8], align 1
; CHECK-NEXT:    store i8 49, ptr [[STACK]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[RES:%.*]] = call i32 @memcmp(ptr nonnull dereferenceable(2) [[FOO:%.*]], ptr nonnull dereferenceable(2) [[STACK]], i64 2)
; CHECK-NEXT:    ret i32 [[RES]]
;
entry:
  %stack = alloca [10 x i8]
  store i8 49, ptr %stack, align 1
  %gep.1 = getelementptr i8, ptr %stack, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %stack, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep.3 = getelementptr i8, ptr %stack, i64 3
  store i8 52, ptr %gep.3, align 1
  %res = call i32 @memcmp(ptr nonnull dereferenceable(2) %foo, ptr nonnull dereferenceable(2) %stack, i64 2)
  ret i32 %res
}

define i32 @test_memcmp_variable_size(ptr noalias %foo, i64 %n) {
; CHECK-LABEL: @test_memcmp_variable_size(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STACK:%.*]] = alloca [10 x i8], align 1
; CHECK-NEXT:    store i8 49, ptr [[STACK]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[GEP_2:%.*]] = getelementptr i8, ptr [[STACK]], i64 2
; CHECK-NEXT:    store i8 51, ptr [[GEP_2]], align 1
; CHECK-NEXT:    [[GEP_3:%.*]] = getelementptr i8, ptr [[STACK]], i64 3
; CHECK-NEXT:    store i8 52, ptr [[GEP_3]], align 1
; CHECK-NEXT:    [[RES:%.*]] = call i32 @memcmp(ptr nonnull [[FOO:%.*]], ptr nonnull [[STACK]], i64 [[N:%.*]])
; CHECK-NEXT:    ret i32 [[RES]]
;
entry:
  %stack = alloca [10 x i8]
  store i8 49, ptr %stack, align 1
  %gep.1 = getelementptr i8, ptr %stack, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %stack, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep.3 = getelementptr i8, ptr %stack, i64 3
  store i8 52, ptr %gep.3, align 1
  %res = call i32 @memcmp(ptr nonnull %foo, ptr nonnull %stack, i64 %n)
  ret i32 %res
}

declare i32 @bcmp(ptr, ptr, i64)

define i1 @test_bcmp_const_size(ptr noalias %foo) {
; CHECK-LABEL: @test_bcmp_const_size(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STACK:%.*]] = alloca [10 x i8], align 1
; CHECK-NEXT:    store i8 49, ptr [[STACK]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[CALL:%.*]] = call i32 @bcmp(ptr nonnull dereferenceable(2) [[FOO:%.*]], ptr nonnull dereferenceable(2) [[STACK]], i64 2)
; CHECK-NEXT:    [[RES:%.*]] = icmp eq i32 [[CALL]], 0
; CHECK-NEXT:    ret i1 [[RES]]
;
entry:
  %stack = alloca [10 x i8]
  store i8 49, ptr %stack, align 1
  %gep.1 = getelementptr i8, ptr %stack, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %stack, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep.3 = getelementptr i8, ptr %stack, i64 3
  store i8 52, ptr %gep.3, align 1
  %call = call i32 @bcmp(ptr nonnull dereferenceable(2) %foo, ptr nonnull dereferenceable(2) %stack, i64 2)
  %res = icmp eq i32 %call, 0
  ret i1 %res
}

define i1 @test_bcmp_variable_size(ptr noalias %foo, i64 %n) {
; CHECK-LABEL: @test_bcmp_variable_size(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STACK:%.*]] = alloca [10 x i8], align 1
; CHECK-NEXT:    store i8 49, ptr [[STACK]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[GEP_2:%.*]] = getelementptr i8, ptr [[STACK]], i64 2
; CHECK-NEXT:    store i8 51, ptr [[GEP_2]], align 1
; CHECK-NEXT:    [[GEP_3:%.*]] = getelementptr i8, ptr [[STACK]], i64 3
; CHECK-NEXT:    store i8 52, ptr [[GEP_3]], align 1
; CHECK-NEXT:    [[CALL:%.*]] = call i32 @bcmp(ptr nonnull [[FOO:%.*]], ptr nonnull [[STACK]], i64 [[N:%.*]])
; CHECK-NEXT:    [[RES:%.*]] = icmp eq i32 [[CALL]], 0
; CHECK-NEXT:    ret i1 [[RES]]
;
entry:
  %stack = alloca [10 x i8]
  store i8 49, ptr %stack, align 1
  %gep.1 = getelementptr i8, ptr %stack, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %stack, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep.3 = getelementptr i8, ptr %stack, i64 3
  store i8 52, ptr %gep.3, align 1
  %call = call i32 @bcmp(ptr nonnull %foo, ptr nonnull %stack, i64 %n)
  %res = icmp eq i32 %call, 0
  ret i1 %res
}

declare ptr @memchr(ptr, i32, i64)

define ptr @test_memchr_const_size() {
; CHECK-LABEL: @test_memchr_const_size(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STACK:%.*]] = alloca [10 x i8], align 1
; CHECK-NEXT:    store i8 49, ptr [[STACK]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @memchr(ptr [[STACK]], i32 42, i64 2)
; CHECK-NEXT:    ret ptr [[CALL]]
;
entry:
  %stack = alloca [10 x i8]
  store i8 49, ptr %stack, align 1
  %gep.1 = getelementptr i8, ptr %stack, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %stack, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep.3 = getelementptr i8, ptr %stack, i64 3
  store i8 52, ptr %gep.3, align 1
  %call = call ptr @memchr(ptr %stack, i32 42, i64 2)
  ret ptr %call
}

define ptr @test_memchr_variable_size(i64 %n) {
; CHECK-LABEL: @test_memchr_variable_size(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STACK:%.*]] = alloca [10 x i8], align 1
; CHECK-NEXT:    store i8 49, ptr [[STACK]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[GEP_2:%.*]] = getelementptr i8, ptr [[STACK]], i64 2
; CHECK-NEXT:    store i8 51, ptr [[GEP_2]], align 1
; CHECK-NEXT:    [[GEP:%.*]] = getelementptr i8, ptr [[STACK]], i64 4
; CHECK-NEXT:    store i8 52, ptr [[GEP]], align 1
; CHECK-NEXT:    [[CALL:%.*]] = call ptr @memchr(ptr [[STACK]], i32 42, i64 [[N:%.*]])
; CHECK-NEXT:    ret ptr [[CALL]]
;
entry:
  %stack = alloca [10 x i8]
  store i8 49, ptr %stack, align 1
  %gep.1 = getelementptr i8, ptr %stack, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %stack, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep = getelementptr i8, ptr %stack, i64 4
  store i8 52, ptr %gep, align 1
  %call = call ptr @memchr(ptr %stack, i32 42, i64 %n)
  ret ptr %call
}

declare ptr @memccpy(ptr, ptr, i32, i64)

define ptr @test_memccpy_const_size(ptr %foo) {
; CHECK-LABEL: @test_memccpy_const_size(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STACK:%.*]] = alloca [10 x i8], align 1
; CHECK-NEXT:    store i8 49, ptr [[STACK]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[RES:%.*]] = call ptr @memccpy(ptr [[FOO:%.*]], ptr [[STACK]], i32 42, i64 2)
; CHECK-NEXT:    ret ptr [[RES]]
;
entry:
  %stack = alloca [10 x i8]
  store i8 49, ptr %stack, align 1
  %gep.1 = getelementptr i8, ptr %stack, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %stack, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep.3 = getelementptr i8, ptr %stack, i64 3
  store i8 52, ptr %gep.3, align 1
  %res = call ptr @memccpy(ptr %foo, ptr %stack, i32 42, i64 2)
  ret ptr %res
}

define ptr @test_memccpy_variable_size(ptr %foo, i64 %n) {
; CHECK-LABEL: @test_memccpy_variable_size(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STACK:%.*]] = alloca [10 x i8], align 1
; CHECK-NEXT:    store i8 49, ptr [[STACK]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[STACK]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[GEP_2:%.*]] = getelementptr i8, ptr [[STACK]], i64 2
; CHECK-NEXT:    store i8 51, ptr [[GEP_2]], align 1
; CHECK-NEXT:    [[GEP_3:%.*]] = getelementptr i8, ptr [[STACK]], i64 3
; CHECK-NEXT:    store i8 52, ptr [[GEP_3]], align 1
; CHECK-NEXT:    [[RES:%.*]] = call ptr @memccpy(ptr [[FOO:%.*]], ptr [[STACK]], i32 42, i64 [[N:%.*]])
; CHECK-NEXT:    ret ptr [[RES]]
;
entry:
  %stack = alloca [10 x i8]
  store i8 49, ptr %stack, align 1
  %gep.1 = getelementptr i8, ptr %stack, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %stack, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep.3 = getelementptr i8, ptr %stack, i64 3
  store i8 52, ptr %gep.3, align 1
  %res = call ptr @memccpy(ptr %foo, ptr %stack, i32 42, i64 %n)
  ret ptr %res
}

; Make sure memccpy does not kill any stores, because it is not known how many
; bytes are written.
define ptr @test_memccpy_const_size_does_not_kill_stores(ptr noalias %dest, ptr noalias %foo) {
; CHECK-LABEL: @test_memccpy_const_size_does_not_kill_stores(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    store i8 49, ptr [[DEST:%.*]], align 1
; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i8, ptr [[DEST]], i64 1
; CHECK-NEXT:    store i8 50, ptr [[GEP_1]], align 1
; CHECK-NEXT:    [[GEP_2:%.*]] = getelementptr i8, ptr [[DEST]], i64 2
; CHECK-NEXT:    store i8 51, ptr [[GEP_2]], align 1
; CHECK-NEXT:    [[GEP_3:%.*]] = getelementptr i8, ptr [[DEST]], i64 3
; CHECK-NEXT:    store i8 52, ptr [[GEP_3]], align 1
; CHECK-NEXT:    [[RES:%.*]] = call ptr @memccpy(ptr [[DEST]], ptr [[FOO:%.*]], i32 42, i64 2)
; CHECK-NEXT:    ret ptr [[RES]]
;
entry:
  store i8 49, ptr %dest, align 1
  %gep.1 = getelementptr i8, ptr %dest, i64 1
  store i8 50, ptr %gep.1, align 1
  %gep.2 = getelementptr i8, ptr %dest, i64 2
  store i8 51, ptr %gep.2, align 1
  %gep.3 = getelementptr i8, ptr %dest, i64 3
  store i8 52, ptr %gep.3, align 1
  %res = call ptr @memccpy(ptr %dest, ptr %foo, i32 42, i64 2)
  ret ptr %res
}

define void @dse_strcpy(ptr nocapture readonly %src) {
; CHECK-LABEL: @dse_strcpy(
; CHECK-NEXT:    [[A:%.*]] = alloca [256 x i8], align 16
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 256, ptr nonnull [[A]])
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(i64 256, ptr nonnull [[A]])
; CHECK-NEXT:    ret void
;
  %a = alloca [256 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %a)
  call ptr @strcpy(ptr nonnull %a, ptr nonnull dereferenceable(1) %src)
  call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %a)
  ret void
}

define void @dse_strncpy(ptr nocapture readonly %src) {
; CHECK-LABEL: @dse_strncpy(
; CHECK-NEXT:    [[A:%.*]] = alloca [256 x i8], align 16
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 256, ptr nonnull [[A]])
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(i64 256, ptr nonnull [[A]])
; CHECK-NEXT:    ret void
;
  %a = alloca [256 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %a)
  call ptr @strncpy(ptr nonnull %a, ptr nonnull dereferenceable(1) %src, i64 6)
  call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %a)
  ret void
}

define void @dse_strcat(ptr nocapture readonly %src) {
; CHECK-LABEL: @dse_strcat(
; CHECK-NEXT:    [[A:%.*]] = alloca [256 x i8], align 16
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 256, ptr nonnull [[A]])
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(i64 256, ptr nonnull [[A]])
; CHECK-NEXT:    ret void
;
  %a = alloca [256 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %a)
  call ptr @strcat(ptr nonnull %a, ptr nonnull dereferenceable(1) %src)
  call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %a)
  ret void
}

define void @dse_strncat(ptr nocapture readonly %src) {
; CHECK-LABEL: @dse_strncat(
; CHECK-NEXT:    [[A:%.*]] = alloca [256 x i8], align 16
; CHECK-NEXT:    call void @llvm.lifetime.start.p0(i64 256, ptr nonnull [[A]])
; CHECK-NEXT:    call void @llvm.lifetime.end.p0(i64 256, ptr nonnull [[A]])
; CHECK-NEXT:    ret void
;
  %a = alloca [256 x i8], align 16
  call void @llvm.lifetime.start.p0(i64 256, ptr nonnull %a)
  call ptr @strncat(ptr nonnull %a, ptr nonnull dereferenceable(1) %src, i64 6)
  call void @llvm.lifetime.end.p0(i64 256, ptr nonnull %a)
  ret void
}

declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)

declare void @llvm.memset.p0.i64(ptr nocapture, i8, i64, i1) nounwind

; Test that strncpy/memset overwriting each other is optimized out

; strncpy -> memset, full overwrite
define void @dse_strncpy_test1(ptr noalias %out, ptr noalias %in) {
; CHECK-LABEL: @dse_strncpy_test1(
; CHECK-NEXT:    tail call void @llvm.memset.p0.i64(ptr [[OUT:%.*]], i8 42, i64 100, i1 false)
; CHECK-NEXT:    ret void
;
  %call = tail call ptr @strncpy(ptr %out, ptr %in, i64 100)
  tail call void @llvm.memset.p0.i64(ptr %out, i8 42, i64 100, i1 false)
  ret void
}

; strncpy -> memset, partial overwrite
define void @dse_strncpy_test2(ptr noalias %out, ptr noalias %in) {
; CHECK-LABEL: @dse_strncpy_test2(
; CHECK-NEXT:    [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT:%.*]], ptr [[IN:%.*]], i64 100)
; CHECK-NEXT:    tail call void @llvm.memset.p0.i64(ptr [[OUT]], i8 42, i64 99, i1 false)
; CHECK-NEXT:    ret void
;
  %call = tail call ptr @strncpy(ptr %out, ptr %in, i64 100)
  tail call void @llvm.memset.p0.i64(ptr %out, i8 42, i64 99, i1 false)
  ret void
}

; strncpy -> memset, different destination
define void @dse_strncpy_test3(ptr noalias %out1, ptr noalias %out2, ptr noalias %in) {
; CHECK-LABEL: @dse_strncpy_test3(
; CHECK-NEXT:    [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT1:%.*]], ptr [[IN:%.*]], i64 100)
; CHECK-NEXT:    tail call void @llvm.memset.p0.i64(ptr [[OUT2:%.*]], i8 42, i64 100, i1 false)
; CHECK-NEXT:    ret void
;
  %call = tail call ptr @strncpy(ptr %out1, ptr %in, i64 100)
  tail call void @llvm.memset.p0.i64(ptr %out2, i8 42, i64 100, i1 false)
  ret void
}

; memset -> strncpy, full overwrite
define void @dse_strncpy_test4(ptr noalias %out, ptr noalias %in) {
; CHECK-LABEL: @dse_strncpy_test4(
; CHECK-NEXT:    [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT:%.*]], ptr [[IN:%.*]], i64 100)
; CHECK-NEXT:    ret void
;
  tail call void @llvm.memset.p0.i64(ptr %out, i8 42, i64 100, i1 false)
  %call = tail call ptr @strncpy(ptr %out, ptr %in, i64 100)
  ret void
}

; memset -> strncpy, partial overwrite
define void @dse_strncpy_test5(ptr noalias %out, ptr noalias %in) {
; CHECK-LABEL: @dse_strncpy_test5(
; CHECK-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i8, ptr [[OUT:%.*]], i64 99
; CHECK-NEXT:    tail call void @llvm.memset.p0.i64(ptr align 1 [[TMP1]], i8 42, i64 1, i1 false)
; CHECK-NEXT:    [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT]], ptr [[IN:%.*]], i64 99)
; CHECK-NEXT:    ret void
;
  tail call void @llvm.memset.p0.i64(ptr %out, i8 42, i64 100, i1 false)
  %call = tail call ptr @strncpy(ptr %out, ptr %in, i64 99)
  ret void
}

; memset -> strncpy, different destination
define void @dse_strncpy_test6(ptr noalias %out1, ptr noalias %out2, ptr noalias %in) {
; CHECK-LABEL: @dse_strncpy_test6(
; CHECK-NEXT:    tail call void @llvm.memset.p0.i64(ptr [[OUT1:%.*]], i8 42, i64 100, i1 false)
; CHECK-NEXT:    [[CALL:%.*]] = tail call ptr @strncpy(ptr [[OUT2:%.*]], ptr [[IN:%.*]], i64 100)
; CHECK-NEXT:    ret void
;
  tail call void @llvm.memset.p0.i64(ptr %out1, i8 42, i64 100, i1 false)
  %call = tail call ptr @strncpy(ptr %out2, ptr %in, i64 100)
  ret void
}