PR10987: add a missed safety check to isSafePHIToSpeculate in scalarrepl.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140327 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 40 insertions, 0 deletions

diff --git a/test/Transforms/ScalarRepl/2011-09-22-PHISpeculateInvoke.ll b/test/Transforms/ScalarRepl/2011-09-22-PHISpeculateInvoke.ll
new file mode 100644
index 0000000..f98f3e8
--- /dev/null
+++ b/test/Transforms/ScalarRepl/2011-09-22-PHISpeculateInvoke.ll
@@ -0,0 +1,40 @@
+; RUN: opt < %s -scalarrepl -S | FileCheck %s
+; PR10987
+
+; Make sure scalarrepl doesn't move a load across an invoke which could
+; modify the loaded value.
+; (The PHI could theoretically be transformed by splitting the critical
+; edge, but scalarrepl doesn't modify the CFG, at least at the moment.)
+
+declare void @extern_fn(i32*)
+declare i32 @extern_fn2(i32)
+declare i32 @__gcc_personality_v0(i32, i64, i8*, i8*)
+
+define void @odd_fn(i1) noinline {
+  %retptr1 = alloca i32
+  %retptr2 = alloca i32
+  br i1 %0, label %then, label %else
+
+then:                                             ; preds = %2
+  invoke void @extern_fn(i32* %retptr1)
+          to label %join unwind label %unwind
+
+else:                                             ; preds = %2
+  store i32 3, i32* %retptr2
+  br label %join
+
+join:                                             ; preds = %then, %else
+  %storemerge.in = phi i32* [ %retptr2, %else ], [ %retptr1, %then ]
+  %storemerge = load i32* %storemerge.in
+  %x3 = call i32 @extern_fn2(i32 %storemerge)
+  ret void
+
+unwind:                                           ; preds = %then
+  %info = landingpad { i8*, i32 } personality i32 (i32, i64, i8*, i8*)* @__gcc_personality_v0
+          cleanup
+  call void @extern_fn(i32* null)
+  unreachable
+}
+
+; CHECK: define void @odd_fn
+; CHECK: %storemerge.in = phi i32* [ %retptr2, %else ], [ %retptr1, %then ]