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Fix shortening casts of long long

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see added testcase.
This commit is contained in:
Michael Matz 2018-03-31 21:52:20 +02:00
parent c41caac02d
commit f0a25ca263
2 changed files with 12 additions and 3 deletions
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10
tccgen.c
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@ -2633,18 +2633,22 @@ static void gen_cast(CType *type)
tcc_warning("nonportable conversion from pointer to char/short"); tcc_warning("nonportable conversion from pointer to char/short");
} }
force_charshort_cast(dbt); force_charshort_cast(dbt);
#if PTR_SIZE == 4
} else if ((dbt & VT_BTYPE) == VT_INT) { } else if ((dbt & VT_BTYPE) == VT_INT) {
/* scalar to int */ /* scalar to int */
if ((sbt & VT_BTYPE) == VT_LLONG) { if ((sbt & VT_BTYPE) == VT_LLONG) {
#if PTR_SIZE == 4
/* from long long: just take low order word */ /* from long long: just take low order word */
lexpand(); lexpand();
vpop(); vpop();
} #else
vpushi(0xffffffff);
vtop->type.t |= VT_UNSIGNED;
gen_op('&');
#endif
}
/* if lvalue and single word type, nothing to do because /* if lvalue and single word type, nothing to do because
the lvalue already contains the real type size (see the lvalue already contains the real type size (see
VT_LVAL_xxx constants) */ VT_LVAL_xxx constants) */
#endif
} }
} }
} else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) { } else if ((dbt & VT_BTYPE) == VT_PTR && !(vtop->r & VT_LVAL)) {

5
tests/tcctest.c
View File

@ -2491,6 +2491,11 @@ void longlong_test(void)
a = 0x123; a = 0x123;
long long *p = &a; long long *p = &a;
llshift(*p, 5); llshift(*p, 5);
/* shortening followed by widening */
unsigned long long u = 0x8000000000000001ULL;
u = (unsigned)(u + 1);
printf("long long u=" ULONG_LONG_FORMAT "\n", u);
} }
void manyarg_test(void) void manyarg_test(void)