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Avoid typeless storage in wide-int

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* wide-int.h (trailing_wide_ints <N>): Turn len to array of structures
	so it does not imply typeless storage.
	(trailing_wide_ints <N>::operator): update
	(trailing_wide_ints <N>::operator []): Update.
This commit is contained in:
Jan Hubicka 2020-10-29 16:44:48 +01:00
parent 815baade9a
commit 0da3e7668c
1 changed files with 6 additions and 4 deletions
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10
gcc/wide-int.h
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@ -1387,8 +1387,10 @@ private:
/* The shared maximum length of each number. */
unsigned char m_max_len;
/* The current length of each number. */
unsigned char m_len[N];
/* The current length of each number.
Avoid char array so the whole structure is not a typeless storage
that will, in turn, turn off TBAA on gimple, trees and RTL. */
struct {unsigned char len;} m_len[N];
/* The variable-length part of the structure, which always contains
at least one HWI. Element I starts at index I * M_MAX_LEN. */
@ -1470,7 +1472,7 @@ template <int N>
inline trailing_wide_int
trailing_wide_ints <N>::operator [] (unsigned int index)
{
return trailing_wide_int_storage (m_precision, &m_len[index],
return trailing_wide_int_storage (m_precision, &m_len[index].len,
&m_val[index * m_max_len]);
}
@ -1479,7 +1481,7 @@ inline typename trailing_wide_ints <N>::const_reference
trailing_wide_ints <N>::operator [] (unsigned int index) const
{
return wi::storage_ref (&m_val[index * m_max_len],
m_len[index], m_precision);
m_len[index].len, m_precision);
}
/* Return how many extra bytes need to be added to the end of the structure