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export function w $f() {
@start
%x0 =w loadsb $a
# the extension must not be eliminated
# even though the load already extended
%x1 =l extsb %x0
%c =w ceql %x1, -1
ret %c
}
# >>> driver
# char a = -1;
# extern int f();
# int main() { return !(f() == 1); }
# <<<
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