Test for lazy value info's ability to prove the absense of NULLs in pointers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123601 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 103 insertions, 0 deletions

diff --git a/test/Transforms/CorrelatedValuePropagation/non-null.ll b/test/Transforms/CorrelatedValuePropagation/non-null.ll
new file mode 100644
index 0000000000..b14abd8369
--- /dev/null
+++ b/test/Transforms/CorrelatedValuePropagation/non-null.ll
@@ -0,0 +1,103 @@
+; RUN: opt < %s -correlated-propagation -S | FileCheck %s
+
+define void @test1(i8* %ptr) {
+; CHECK: test1
+  %A = load i8* %ptr
+  br label %bb
+bb:
+  icmp ne i8* %ptr, null
+; CHECK-NOT: icmp
+  ret void
+}
+
+define void @test2(i8* %ptr) {
+; CHECK: test2
+  store i8 0, i8* %ptr
+  br label %bb
+bb:
+  icmp ne i8* %ptr, null
+; CHECK-NOT: icmp
+  ret void
+}
+
+define void @test3() {
+; CHECK: test3
+  %ptr = alloca i8
+  br label %bb
+bb:
+  icmp ne i8* %ptr, null
+; CHECK-NOT: icmp
+  ret void
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
+define void @test4(i8* %dest, i8* %src) {
+; CHECK: test4
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 1, i32 1, i1 false)
+  br label %bb
+bb:
+  icmp ne i8* %dest, null
+  icmp ne i8* %src, null
+; CHECK-NOT: icmp
+  ret void
+}
+
+declare void @llvm.memmove.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
+define void @test5(i8* %dest, i8* %src) {
+; CHECK: test5
+  call void @llvm.memmove.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 1, i32 1, i1 false)
+  br label %bb
+bb:
+  icmp ne i8* %dest, null
+  icmp ne i8* %src, null
+; CHECK-NOT: icmp
+  ret void
+}
+
+declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i32, i1)
+define void @test6(i8* %dest) {
+; CHECK: test6
+  call void @llvm.memset.p0i8.i32(i8* %dest, i8 255, i32 1, i32 1, i1 false)
+  br label %bb
+bb:
+  icmp ne i8* %dest, null
+; CHECK-NOT: icmp
+  ret void
+}
+
+define void @test7(i8* %dest, i8* %src, i32 %len) {
+; CHECK: test7
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 %len, i32 1, i1 false)
+  br label %bb
+bb:
+  %KEEP1 = icmp ne i8* %dest, null
+; CHECK: KEEP1
+  %KEEP2 = icmp ne i8* %src, null
+; CHECK: KEEP2
+  ret void
+}
+
+declare void @llvm.memcpy.p1i8.p1i8.i32(i8 addrspace(1) *, i8 addrspace(1) *, i32, i32, i1)
+define void @test8(i8 addrspace(1) * %dest, i8 addrspace(1) * %src) {
+; CHECK: test8
+  call void @llvm.memcpy.p1i8.p1i8.i32(i8 addrspace(1) * %dest, i8 addrspace(1) * %src, i32 1, i32 1, i1 false)
+  br label %bb
+bb:
+  %KEEP1 = icmp ne i8 addrspace(1) * %dest, null
+; CHECK: KEEP1
+  %KEEP2 = icmp ne i8 addrspace(1) * %src, null
+; CHECK: KEEP2
+  ret void
+}
+
+define void @test9(i8* %dest, i8* %src) {
+; CHECK: test9
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dest, i8* %src, i32 1, i32 1, i1 true)
+  br label %bb
+bb:
+  %KEEP1 = icmp ne i8* %dest, null
+; CHECK: KEEP1
+  %KEEP2 = icmp ne i8* %src, null
+; CHECK: KEEP2
+  ret void
+}