Comment # 10
on bug 84232
from Vitaliy Filippov
I've managed to make a reduced test case with a recursive PHI after
StructurizeCFG !!!
int main()
{
int i, j = 0;
while (j % 2)
{
if (j > 100)
j += 3;
else if (j > 50)
break;
}
return j;
}
clang-3.5 -S -emit-llvm test3.c
opt-3.5 -S -structurizecfg test3.ll > test3cfg.ll
Simple to visualise with graphviz:
( echo 'digraph G {'; perl -ne 'if (/\%(\S+) = phi/) { my $a = $1; print "$a ->
$_;\n" for /\[ \%([^\s,]+)/g; }' test3cfg.ll; echo '}' ) > test3cfg.dot
dot -Tsvg test3cfg.dot > test3cfg.svg
%21 and %26 phi's loop in the result.
Also there is a branch on constant in the end of test3cfg.ll:
br i1 false, label %14, label %Flow2
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