third_party/llvm-7.0/llvm/test/Transforms/InstSimplify/noalias-ptr.ll

; RUN: opt -instsimplify -S < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@g1 = global i32 0, align 4
@g2 = internal global i32 0, align 4
@g3 = unnamed_addr global i32 0, align 4
@g4 = hidden global i32 0, align 4
@g5 = protected global i32 0, align 4
@g6 = thread_local unnamed_addr global i32 0, align 4

; Make sure we can simplify away a pointer comparison between
; dynamically-allocated memory and a local stack allocation.
;   void p()
;   {
;     int *mData;
;     int mStackData[10];
;     mData = new int[12];
;     if (mData != mStackData) {
;       delete[] mData;
;     }
;   }

define void @_Z2p1v() #0 {
  %mStackData = alloca [10 x i32], align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = tail call noalias i8* @_Znam(i64 48) #4
  %3 = bitcast i8* %2 to i32*
  %4 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %5 = icmp eq i32* %3, %4
  br i1 %5, label %7, label %6

; CHECK-LABEL: @_Z2p1v
; CHECK-NOT: icmp
; CHECK: ret void

; <label>:6                                       ; preds = %0
  call void @_ZdaPv(i8* %2) #5
  br label %7

; <label>:7                                       ; preds = %0, %6
  ret void
}

; Also check a more-complicated case with multiple underlying objects.

define void @_Z2p2bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
  %mStackData = alloca [10 x i32], align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %3 = select i1 %b1, i32* %2, i32* @g2
  %4 = tail call noalias i8* @_Znam(i64 48) #4
  %5 = tail call noalias i8* @_Znam(i64 48) #4
  %.v = select i1 %b2, i8* %4, i8* %5
  %6 = bitcast i8* %.v to i32*
  %7 = icmp eq i32* %6, %3
  br i1 %7, label %9, label %8

; CHECK-LABEL: @_Z2p2bb
; CHECK-NOT: icmp
; CHECK: ret void

; <label>:8                                       ; preds = %0
  call void @_ZdaPv(i8* %4) #5
  call void @_ZdaPv(i8* %5) #5
  br label %9

; <label>:9                                       ; preds = %0, %8
  ret void
}

define void @_Z2p4bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
  %mStackData = alloca [10 x i32], align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %3 = select i1 %b1, i32* %2, i32* @g3
  %4 = tail call noalias i8* @_Znam(i64 48) #4
  %5 = tail call noalias i8* @_Znam(i64 48) #4
  %.v = select i1 %b2, i8* %4, i8* %5
  %6 = bitcast i8* %.v to i32*
  %7 = icmp eq i32* %6, %3
  br i1 %7, label %9, label %8

; CHECK-LABEL: @_Z2p4bb
; CHECK-NOT: icmp
; CHECK: ret void

; <label>:8                                       ; preds = %0
  call void @_ZdaPv(i8* %4) #5
  call void @_ZdaPv(i8* %5) #5
  br label %9

; <label>:9                                       ; preds = %0, %8
  ret void
}

define void @_Z2p5bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
  %mStackData = alloca [10 x i32], align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %3 = select i1 %b1, i32* %2, i32* @g4
  %4 = tail call noalias i8* @_Znam(i64 48) #4
  %5 = tail call noalias i8* @_Znam(i64 48) #4
  %.v = select i1 %b2, i8* %4, i8* %5
  %6 = bitcast i8* %.v to i32*
  %7 = icmp eq i32* %6, %3
  br i1 %7, label %9, label %8

; CHECK-LABEL: @_Z2p5bb
; CHECK-NOT: icmp
; CHECK: ret void

; <label>:8                                       ; preds = %0
  call void @_ZdaPv(i8* %4) #5
  call void @_ZdaPv(i8* %5) #5
  br label %9

; <label>:9                                       ; preds = %0, %8
  ret void
}

define void @_Z2p6bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
  %mStackData = alloca [10 x i32], align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %3 = select i1 %b1, i32* %2, i32* @g5
  %4 = tail call noalias i8* @_Znam(i64 48) #4
  %5 = tail call noalias i8* @_Znam(i64 48) #4
  %.v = select i1 %b2, i8* %4, i8* %5
  %6 = bitcast i8* %.v to i32*
  %7 = icmp eq i32* %6, %3
  br i1 %7, label %9, label %8

; CHECK-LABEL: @_Z2p6bb
; CHECK-NOT: icmp
; CHECK: ret void

; <label>:8                                       ; preds = %0
  call void @_ZdaPv(i8* %4) #5
  call void @_ZdaPv(i8* %5) #5
  br label %9

; <label>:9                                       ; preds = %0, %8
  ret void
}

; Here's another case involving multiple underlying objects, but this time we
; must keep the comparison (it might involve a regular pointer-typed function
; argument).

define void @_Z4nopebbPi(i1 zeroext %b1, i1 zeroext %b2, i32* readnone %q) #0 {
  %mStackData = alloca [10 x i32], align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %3 = select i1 %b1, i32* %2, i32* %q
  %4 = tail call noalias i8* @_Znam(i64 48) #4
  %5 = tail call noalias i8* @_Znam(i64 48) #4
  %.v = select i1 %b2, i8* %4, i8* %5
  %6 = bitcast i8* %.v to i32*
  %7 = icmp eq i32* %6, %3
  br i1 %7, label %9, label %8

; CHECK-LABEL: @_Z4nopebbPi
; CHECK: icmp
; CHECK: ret void

; <label>:8                                       ; preds = %0
  call void @_ZdaPv(i8* %4) #5
  call void @_ZdaPv(i8* %5) #5
  br label %9

; <label>:9                                       ; preds = %0, %8
  ret void
}

define void @_Z2p3bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
  %mStackData = alloca [10 x i32], align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %3 = select i1 %b1, i32* %2, i32* @g1
  %4 = tail call noalias i8* @_Znam(i64 48) #4
  %5 = tail call noalias i8* @_Znam(i64 48) #4
  %.v = select i1 %b2, i8* %4, i8* %5
  %6 = bitcast i8* %.v to i32*
  %7 = icmp eq i32* %6, %3
  br i1 %7, label %9, label %8

; CHECK-LABEL: @_Z2p3bb
; CHECK: icmp
; CHECK: ret void

; <label>:8                                       ; preds = %0
  call void @_ZdaPv(i8* %4) #5
  call void @_ZdaPv(i8* %5) #5
  br label %9

; <label>:9                                       ; preds = %0, %8
  ret void
}

define void @_Z2p7bb(i1 zeroext %b1, i1 zeroext %b2) #0 {
  %mStackData = alloca [10 x i32], align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %3 = select i1 %b1, i32* %2, i32* @g6
  %4 = tail call noalias i8* @_Znam(i64 48) #4
  %5 = tail call noalias i8* @_Znam(i64 48) #4
  %.v = select i1 %b2, i8* %4, i8* %5
  %6 = bitcast i8* %.v to i32*
  %7 = icmp eq i32* %6, %3
  br i1 %7, label %9, label %8

; CHECK-LABEL: @_Z2p7bb
; CHECK: icmp
; CHECK: ret void

; <label>:8                                       ; preds = %0
  call void @_ZdaPv(i8* %4) #5
  call void @_ZdaPv(i8* %5) #5
  br label %9

; <label>:9                                       ; preds = %0, %8
  ret void
}

define void @_Z2p2v(i32 %c) #0 {
  %mStackData = alloca [10 x i32], i32 %c, align 16
  %1 = bitcast [10 x i32]* %mStackData to i8*
  %2 = tail call noalias i8* @_Znam(i64 48) #4
  %3 = bitcast i8* %2 to i32*
  %4 = getelementptr inbounds [10 x i32], [10 x i32]* %mStackData, i64 0, i64 0
  %5 = icmp eq i32* %3, %4
  br i1 %5, label %7, label %6

; CHECK-LABEL: @_Z2p2v
; CHECK: icmp
; CHECK: ret void

; <label>:6                                       ; preds = %0
  call void @_ZdaPv(i8* %2) #5
  br label %7

; <label>:7                                       ; preds = %0, %6
  ret void
}

; Function Attrs: nobuiltin
declare noalias i8* @_Znam(i64) #2

; Function Attrs: nobuiltin nounwind
declare void @_ZdaPv(i8*) #3

attributes #0 = { uwtable }
attributes #1 = { nounwind }
attributes #2 = { nobuiltin }
attributes #3 = { nobuiltin nounwind }
attributes #4 = { builtin }
attributes #5 = { builtin nounwind }