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tcg: Increase minimum alignment from tcg_malloc to 8

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For a 64-bit ILP32 host, aligning to sizeof(long) is not enough.
Guess the minimum for any host is 8, as that covers uint64_t.
Qemu doesn't use a host long double or host vectors, except in
extremely limited circumstances.

Fixes a bus error for a sparc v8plus host.

Backports commit 13aaef678ed377b12b76dc7fb9e615b2f2f9047b from qemu
This commit is contained in:
Richard Henderson 2018-03-04 01:36:57 -05:00 committed by Lioncash
parent 29ea0681d0
commit b33f2b40e8
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 4 additions and 1 deletions
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5
qemu/tcg/tcg.h
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@ -1058,7 +1058,10 @@ void tcg_optimize(TCGContext *s);
static inline void *tcg_malloc(TCGContext *s, int size)
{
uint8_t *ptr, *ptr_end;
size = (size + sizeof(long) - 1) & ~(sizeof(long) - 1);
/* ??? This is a weak placeholder for minimum malloc alignment. */
size = QEMU_ALIGN_UP(size, 8);
ptr = s->pool_cur;
ptr_end = ptr + size;
if (unlikely(ptr_end > s->pool_end)) {