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new testcase that condprop should handle. The PHI node becomes useless

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after threading the branch, because both operands are the same value.

llvm-svn: 22668
This commit is contained in:
Chris Lattner 2005-08-05 00:59:55 +00:00
parent 915053ba79
commit fe680add54
1 changed files with 36 additions and 0 deletions
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36
test/Regression/Transforms/CondProp/phisimplify2.ll Normal file
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; RUN: llvm-as < %s | opt -condprop | llvm-dis | not grep phi
declare bool %foo()
int %test(uint %C) {
%Val = call bool %foo()
switch uint %C, label %T1 [
uint 4, label %T2
uint 17, label %T3
]
T1:
call void %a()
br label %Cont
T2:
call void %b()
br label %Cont
T3:
call void %c()
br label %Cont
Cont:
;; PHI becomes dead after threading T2
%C2 = phi bool [%Val, %T1], [true, %T2], [%Val, %T3]
br bool %C2, label %L2, label %F2
L2:
call void %d()
ret int 17
F2:
call void %e()
ret int 1
}
declare void %a()
declare void %b()
declare void %c()
declare void %d()
declare void %e()