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opt: Make break and goto not fallthrough

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As we can optimize dead code a bit already it's fitting
to disable code emission after break and goto.
This commit is contained in:
Michael Matz
2016-09-26 20:31:24 +02:00
parent 31c7ea0165
commit ca435dc2e3
2 changed files with 68 additions and 2 deletions
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51
tests/tcctest.c
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@ -1184,6 +1184,57 @@ void optimize_out(void)
printf("oo:%d\n", defined_function());
else
printf("oo:%d\n", undefined_function());
while (1) {
printf("oow:%d\n", defined_function());
break;
printf("oow:%d\n", undefined_function());
}
j = 1;
/* Following is a switch without {} block intentionally. */
switch (j)
case 1: break;
printf ("oos:%d\n", defined_function());
/* The following break shouldn't lead to disabled code after
the while. */
while (1)
break;
printf ("ool1:%d\n", defined_function());
/* Same for the other types of loops. */
do
break;
while (1);
printf ("ool2:%d\n", defined_function());
for (;;)
break;
printf ("ool3:%d\n", defined_function());
/* Normal {} blocks without controlling statements
shouldn't reactivate code emission */
while (1) {
{
break;
}
printf ("ool4:%d\n", undefined_function());
}
j = 1;
while (j) {
if (j == 0)
break; /* this break shouldn't disable code outside the if. */
printf("ool5:%d\n", defined_function());
j--;
}
j = 1;
while (j) {
if (1)
j--;
else
breakhere: break;
printf("ool6:%d\n", defined_function());
goto breakhere;
}
if (1)
return;
printf ("oor:%d\n", undefined_function());
}
int defined_function(void)