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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

llvm-svn: 119009
This commit is contained in:
Duncan Sands 2010-11-13 21:33:19 +00:00
parent 052caec1f3
commit 8c58ba4199
1 changed files with 15 additions and 0 deletions
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15
llvm/test/Transforms/GVN/2010-11-13-Simplify.ll Normal file
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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
}