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tcg: Restrict check_size_impl to multiples of the line size

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Normally this is automatic in the size restrictions that are placed
on vector sizes coming from the implementation. However, for the
legitimate size tuple [oprsz=8, maxsz=32], we need to clear the final
24 bytes of the vector register. Without this check, do_dup selects
TCG_TYPE_V128 and clears only 16 bytes.

Backports commit 499748d7683198a765d17b4fdf6901ab9dca920c from qemu
This commit is contained in:
Richard Henderson 2018-07-09 16:41:50 -04:00 committed by Lioncash
parent 0fb2742a4a
commit f1aaf5be62
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1 changed files with 5 additions and 2 deletions
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7
qemu/tcg/tcg-op-gvec.c
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@ -287,8 +287,11 @@ void tcg_gen_gvec_4_ptr(TCGContext *s, uint32_t dofs, uint32_t aofs, uint32_t bo
in units of LNSZ. This limits the expansion of inline code. */
static inline bool check_size_impl(uint32_t oprsz, uint32_t lnsz)
{
uint32_t lnct = oprsz / lnsz;
return lnct >= 1 && lnct <= MAX_UNROLL;
if (oprsz % lnsz == 0) {
uint32_t lnct = oprsz / lnsz;
return lnct >= 1 && lnct <= MAX_UNROLL;
}
return false;
}
static void expand_clr(TCGContext *s, uint32_t dofs, uint32_t maxsz);