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llvm-project/llvm/test/Transforms/InstSimplify/noalias-ptr.ll

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; 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 }
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