foo.cc: In function 'int main()':
foo.cc:54:9: warning: unused variable 'l' [-Wunused-variable]
54 | int l=1;
| ^
foo.cc:102:17: warning: 'r4' may be used uninitialized in this function [-Wmaybe-uninitialized]
102 | r4=gethalf_1(r4);
| ~~~~~~~~~^~~~
foo.cc:90:17: warning: 'r3' may be used uninitialized in this function [-Wmaybe-uninitialized]
90 | r3=gethalf_1(r3);
| ~~~~~~~~~^~~~
foo.cc:77:17: warning: 'r2' may be used uninitialized in this function [-Wmaybe-uninitialized]
77 | r2=gethalf_1(r2);
| ~~~~~~~~~^~~~
foo.cc:66:17: warning: 'r1' may be used uninitialized in this function [-Wmaybe-uninitialized]
66 | r1=gethalf_1(r1);
| ~~~~~~~~~^~~~
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