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opt: constprop also 'cond && 0'

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We didn't handle constants in logical expressions when they weren't
the first operand.  Some reordering in the loop structure is enough
to handle them.
This commit is contained in:
Michael Matz
2016-09-26 21:21:42 +02:00
parent ca435dc2e3
commit fb933ae0eb
2 changed files with 113 additions and 62 deletions
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39
tests/tcctest.c
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@ -1232,6 +1232,38 @@ void optimize_out(void)
printf("ool6:%d\n", defined_function());
goto breakhere;
}
/* Test that constants in logical && are optimized: */
i = 0 && undefined_function();
i = defined_function() && 0 && undefined_function();
if (0 && undefined_function())
undefined_function();
if (defined_function() && 0)
undefined_function();
if (0 && 0)
undefined_function();
if (defined_function() && 0 && undefined_function())
undefined_function();
/* The same for || : */
i = 1 || undefined_function();
i = defined_function() || 1 || undefined_function();
if (1 || undefined_function())
;
else
undefined_function();
if (defined_function() || 1)
;
else
undefined_function();
if (1 || 1)
;
else
undefined_function();
if (defined_function() || 1 || undefined_function())
;
else
undefined_function();
if (1)
return;
printf ("oor:%d\n", undefined_function());
@ -2544,6 +2576,13 @@ void sizeof_test(void)
printf("sizeof( (struct {int i; int j;}){4,5} ) = %d\n",
sizeof( (struct {int i; int j;}){4,5} ));
/* And as direct sizeof argument (as unary expression): */
printf("sizeof (struct {short i; short j;}){4,5} = %d\n",
sizeof (struct {short i; short j;}){4,5} );
/* sizeof(x && y) should be sizeof(int), even if constant
evaluating is possible. */
printf("sizeof(t && 0) = %d\n", sizeof(t && 0));
printf("sizeof(1 && 1) = %d\n", sizeof(1 && 1));
printf("sizeof(t || 1) = %d\n", sizeof(t || 1));
printf("sizeof(0 || 0) = %d\n", sizeof(0 || 0));
}