[llvm-commits] [llvm] r119009 - /llvm/trunk/test/Transforms/GVN/2010-11-13-Simplify.ll

[Duncan Sands]

Author: baldrick
Date: Sat Nov 13 15:33:19 2010
New Revision: 119009

URL: http://llvm.org/viewvc/llvm-project?rev=119009&view=rev
Log:
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


Added:
    llvm/trunk/test/Transforms/GVN/2010-11-13-Simplify.ll

Added: llvm/trunk/test/Transforms/GVN/2010-11-13-Simplify.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/GVN/2010-11-13-Simplify.ll?rev=119009&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/GVN/2010-11-13-Simplify.ll (added)
+++ llvm/trunk/test/Transforms/GVN/2010-11-13-Simplify.ll Sat Nov 13 15:33:19 2010
@@ -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
+}