Testcase to go along with commit 118923 ("Have GVN simplify instructions

as it goes").  Before -std-compile-opts only got it down to
  %a = tail call i32 @foo(i32 0) readnone
  %x = tail call i32 @foo(i32 %a) readnone
  %y = tail call i32 @foo(i32 %a) readnone
  %z = icmp eq i32 %x, %y
  ret i1 %z
while now -basicaa -gvn alone reduce it to
  %a = call i32 @foo(i32 0) readnone
  %x = call i32 @foo(i32 %a) readnone
  ret i1 true

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119009 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/GVN/2010-11-13-Simplify.ll b/test/Transforms/GVN/2010-11-13-Simplify.ll
new file mode 100644 (file)
index 0000000..07585a2
--- /dev/null
+++ b/test/Transforms/GVN/2010-11-13-Simplify.ll
@@ -0,0 +1,15 @@
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
+
+declare i32 @foo(i32) readnone
+
+define i1 @bar() {
+; CHECK: @bar
+  %a = call i32 @foo (i32 0) readnone
+  %b = call i32 @foo (i32 0) readnone
+  %c = and i32 %a, %b
+  %x = call i32 @foo (i32 %a) readnone
+  %y = call i32 @foo (i32 %c) readnone
+  %z = icmp eq i32 %x, %y
+  ret i1 %z
+; CHECK: ret i1 true
+}