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Add a testcase for the recent duplicate PHI elimination changes.

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llvm-svn: 85636
This commit is contained in:
Dan Gohman 2009-10-30 23:16:10 +00:00
parent c8a5a5ece2
commit cd411a597d
1 changed files with 21 additions and 0 deletions
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21
test/Transforms/SimplifyCFG/duplicate-phis.ll Normal file
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; RUN: opt < %s -instcombine -simplifycfg -S | grep { = phi } | count 1
; instcombine should sort the PHI operands so that simplifycfg can see the
; duplicate and remove it.
define i32 @foo(i1 %t) {
entry:
call void @bar()
br i1 %t, label %true, label %false,
true:
call void @bar()
br label %false
false:
%a = phi i32 [ 2, %true ], [ 5, %entry ]
%b = phi i32 [ 5, %entry ], [ 2, %true ]
call void @bar()
%c = add i32 %a, %b
ret i32 %c
}
declare void @bar()