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New testcase, details in the comments 

llvm-svn: 11495
This commit is contained in:
Chris Lattner 2004-02-16 06:35:19 +00:00
parent 4db2d22bea
commit 58d4db3f27
1 changed files with 32 additions and 0 deletions
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32
llvm/test/Regression/Transforms/SimplifyCFG/UncondBranchToReturn.ll Normal file
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; The unify-function-exit-nodes pass often makes basic blocks that just contain
; a PHI node and a return. Make sure the simplify cfg can straighten out this
; important case. This is basically the most trivial form of tail-duplication.
; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | not grep 'br label'
int %test(bool %B, int %A, int %B) {
br bool %B, label %T, label %F
T:
br label %ret
F:
br label %ret
ret:
%X = phi int [%A, %F], [%B, %T]
ret int %X
}
; Make sure it's willing to move unconditional branches to return instructions
; as well, even if the return block is shared and the source blocks are
; non-empty.
int %test2(bool %B, int %A, int %B) {
br bool %B, label %T, label %F
T:
call int %test(bool true, int 5, int 8)
br label %ret
F:
call int %test(bool true, int 5, int 8)
br label %ret
ret:
ret int %A
}