llvm/test/Transforms/MoveAutoInit/loop.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -passes='move-auto-init' -verify-memoryssa | FileCheck %s

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"

define void @foo(i32 %x) {
; CHECK-LABEL: @foo(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[BUFFER:%.*]] = alloca [80 x i32], align 16
; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr align 16 [[BUFFER]], i8 -86, i64 320, i1 false), !annotation [[META0:![0-9]+]]
; CHECK-NEXT:    br label [[DO_BODY:%.*]]
; CHECK:       do.body:
; CHECK-NEXT:    [[X_ADDR_0:%.*]] = phi i32 [ [[X:%.*]], [[ENTRY:%.*]] ], [ [[DEC:%.*]], [[DO_COND:%.*]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds [80 x i32], ptr [[BUFFER]], i64 0, i64 0
; CHECK-NEXT:    call void @dump(ptr [[ARRAYIDX]])
; CHECK-NEXT:    br label [[DO_COND]]
; CHECK:       do.cond:
; CHECK-NEXT:    [[DEC]] = add nsw i32 [[X_ADDR_0]], -1
; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp ne i32 [[X_ADDR_0]], 0
; CHECK-NEXT:    br i1 [[TOBOOL]], label [[DO_BODY]], label [[DO_END:%.*]]
; CHECK:       do.end:
; CHECK-NEXT:    ret void
;

entry:
  %buffer = alloca [80 x i32], align 16
  call void @llvm.memset.p0.i64(ptr align 16 %buffer, i8 -86, i64 320, i1 false), !annotation !0
  br label %do.body

do.body:                                          ; preds = %do.cond, %entry
  %x.addr.0 = phi i32 [ %x, %entry ], [ %dec, %do.cond ]
  %arrayidx = getelementptr inbounds [80 x i32], ptr %buffer, i64 0, i64 0
  call void @dump(ptr %arrayidx)
  br label %do.cond

do.cond:                                          ; preds = %do.body
  %dec = add nsw i32 %x.addr.0, -1
  %tobool = icmp ne i32 %x.addr.0, 0
  br i1 %tobool, label %do.body, label %do.end

do.end:                                           ; preds = %do.cond
  ret void
}

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

declare void @dump(ptr )

define void @bar(i32 %x, i32 %y) {
; CHECK-LABEL: @bar(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[BUFFER:%.*]] = alloca [80 x i32], align 16
; CHECK-NEXT:    [[TOBOOL:%.*]] = icmp ne i32 [[Y:%.*]], 0
; CHECK-NEXT:    br i1 [[TOBOOL]], label [[IF_THEN:%.*]], label [[IF_END:%.*]]
; CHECK:       if.then:
; CHECK-NEXT:    call void @llvm.memset.p0.i64(ptr align 16 [[BUFFER]], i8 -86, i64 320, i1 false), !annotation [[META0]]
; CHECK-NEXT:    [[ADD:%.*]] = add nsw i32 [[X:%.*]], [[Y]]
; CHECK-NEXT:    br label [[DO_BODY:%.*]]
; CHECK:       do.body:
; CHECK-NEXT:    [[X_ADDR_0:%.*]] = phi i32 [ [[ADD]], [[IF_THEN]] ], [ [[DEC:%.*]], [[DO_COND:%.*]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds [80 x i32], ptr [[BUFFER]], i64 0, i64 0
; CHECK-NEXT:    call void @dump(ptr [[ARRAYIDX]])
; CHECK-NEXT:    br label [[DO_COND]]
; CHECK:       do.cond:
; CHECK-NEXT:    [[DEC]] = add nsw i32 [[X_ADDR_0]], -1
; CHECK-NEXT:    [[TOBOOL1:%.*]] = icmp ne i32 [[X_ADDR_0]], 0
; CHECK-NEXT:    br i1 [[TOBOOL1]], label [[DO_BODY]], label [[DO_END:%.*]]
; CHECK:       do.end:
; CHECK-NEXT:    br label [[IF_END]]
; CHECK:       if.end:
; CHECK-NEXT:    ret void
;

entry:
  %buffer = alloca [80 x i32], align 16
  call void @llvm.memset.p0.i64(ptr align 16 %buffer, i8 -86, i64 320, i1 false), !annotation !0
  %tobool = icmp ne i32 %y, 0
  br i1 %tobool, label %if.then, label %if.end

if.then:                                          ; preds = %entry
  %add = add nsw i32 %x, %y
  br label %do.body

do.body:                                          ; preds = %do.cond, %if.then
  %x.addr.0 = phi i32 [ %add, %if.then ], [ %dec, %do.cond ]
  %arrayidx = getelementptr inbounds [80 x i32], ptr %buffer, i64 0, i64 0
  call void @dump(ptr %arrayidx)
  br label %do.cond

do.cond:                                          ; preds = %do.body
  %dec = add nsw i32 %x.addr.0, -1
  %tobool1 = icmp ne i32 %x.addr.0, 0
  br i1 %tobool1, label %do.body, label %do.end

do.end:                                           ; preds = %do.cond
  br label %if.end

if.end:                                           ; preds = %do.end, %entry
  ret void
}

declare void @dummy()

define void @unreachable_pred() {
; CHECK-LABEL: @unreachable_pred(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[P:%.*]] = alloca [2 x i16], i32 0, align 2
; CHECK-NEXT:    store i32 0, ptr [[P]], align 2, !annotation [[META0]]
; CHECK-NEXT:    br i1 true, label [[LOOP:%.*]], label [[USEBB:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    call void @dummy()
; CHECK-NEXT:    br label [[LOOP]]
; CHECK:       a:
; CHECK-NEXT:    br label [[LOOP]]
; CHECK:       b:
; CHECK-NEXT:    br label [[LOOP]]
; CHECK:       usebb:
; CHECK-NEXT:    [[USE_P:%.*]] = icmp ult ptr null, [[P]]
; CHECK-NEXT:    ret void
;
entry:
  %p = alloca [2 x i16], i32 0, align 2
  store i32 0, ptr %p, align 2, !annotation !0
  br i1 true, label %loop, label %usebb

loop:
  call void @dummy()
  br label %loop

a:
  br label %loop

b:
  br label %loop

usebb:
  %use_p = icmp ult ptr null, %p
  ret void
}

!0 = !{!"auto-init"}