llvm/2010-11-13-Simplify.ll at ce562622118c40d5a24a07960c15cd4912db0cbf - llvm - Gitea: Git with a cup of tea

RPCSX/llvm

mirror of https://github.com/RPCSX/llvm.git synced 2024-12-04 01:43:06 +00:00

Duncan Sands dd609e912b 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

2010-11-13 21:33:19 +00:00

16 lines

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 ; 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
 }