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-rw-r--r--test/Transforms/InstSimplify/noalias-ptr.ll259
1 files changed, 259 insertions, 0 deletions
diff --git a/test/Transforms/InstSimplify/noalias-ptr.ll b/test/Transforms/InstSimplify/noalias-ptr.ll
new file mode 100644
index 0000000..7693e55
--- /dev/null
+++ b/test/Transforms/InstSimplify/noalias-ptr.ll
@@ -0,0 +1,259 @@
+; 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]* %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]* %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]* %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]* %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]* %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]* %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]* %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]* %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]* %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 }
+
generated by cgit v1.1 at 2024-12-22 11:40:10 +0000