Teach jump threading to look at comparisons between phi nodes and non-constants.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73755 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 21 insertions, 0 deletions

diff --git a/test/Transforms/JumpThreading/branch-no-const.ll b/test/Transforms/JumpThreading/branch-no-const.ll
new file mode 100644
index 0000000..0ea2431
--- /dev/null
+++ b/test/Transforms/JumpThreading/branch-no-const.ll
@@ -0,0 +1,21 @@
+; RUN: llvm-as < %s | opt -jump-threading | llvm-dis | not grep phi
+
+declare i8 @mcguffin()
+
+define i32 @test(i1 %foo, i8 %b) {
+entry:
+  %a = call i8 @mcguffin()
+  br i1 %foo, label %bb1, label %bb2
+bb1:
+  br label %jt
+bb2:
+  br label %jt
+jt:
+  %x = phi i8 [%a, %bb1], [%b, %bb2]
+  %A = icmp eq i8 %x, %a
+  br i1 %A, label %rt, label %rf
+rt:
+  ret i32 7
+rf:
+  ret i32 8
+}