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struct-layout: Allow lowering of member alignment

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when an alignment is explicitely given on the member itself,
or on its types attributes then respect it always.  Was only
allowed to increase before, but GCC is allowing it.
This commit is contained in:
Michael Matz 2016-10-17 20:27:23 +02:00
parent 8859dc9e6d
commit f5ae4daa5f
2 changed files with 17 additions and 2 deletions
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3
tccgen.c
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@ -3610,8 +3610,7 @@ static void struct_decl(CType *type, AttributeDef *ad, int u)
alignoverride = 0;
if (ad1.a.aligned) {
int speca = 1 << (ad1.a.aligned - 1);
if (align < speca)
alignoverride = speca;
alignoverride = speca;
} else if (ad1.a.packed || ad->a.packed) {
alignoverride = 1;
} else if (*tcc_state->pack_stack_ptr) {

16
tests/tcctest.c
View File

@ -1087,6 +1087,18 @@ struct Large {
};
} __attribute__((aligned(2 * sizeof(long))));
typedef unsigned long long __attribute__((aligned(4))) unaligned_u64;
struct aligntest9 {
unsigned int buf_nr;
unaligned_u64 start_lba;
};
struct aligntest10 {
unsigned int buf_nr;
unsigned long long start_lba;
};
void struct_test()
{
struct1 *s;
@ -1136,6 +1148,10 @@ void struct_test()
sizeof(struct aligntest7), __alignof__(struct aligntest7));
printf("aligntest8 sizeof=%d alignof=%d\n",
sizeof(struct aligntest8), __alignof__(struct aligntest8));
printf("aligntest9 sizeof=%d alignof=%d\n",
sizeof(struct aligntest9), __alignof__(struct aligntest9));
printf("aligntest10 sizeof=%d alignof=%d\n",
sizeof(struct aligntest10), __alignof__(struct aligntest10));
printf("altest5 sizeof=%d alignof=%d\n",
sizeof(altest5), __alignof__(altest5));
printf("altest6 sizeof=%d alignof=%d\n",