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slp: fix is_linear_load_p to prevent multiple answers

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This fixes an issue where is_linear_load_p could return the incorrect
permutation kind because it is singe pass.

This arranges the candidates in such a way that there won't be any ambiguity so
that the function can still be linear but give correct values.

gcc/ChangeLog:

	* tree-vect-slp-patterns.c (is_linear_load_p): Fix ambiguity.
This commit is contained in:
Tamar Christina 2021-01-11 09:56:44 +00:00
parent 9a6c37e6ae
commit 39666d2b88
1 changed files with 9 additions and 9 deletions
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18
gcc/tree-vect-slp-patterns.c
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@ -140,32 +140,32 @@ is_linear_load_p (load_permutation_t loads)
unsigned load, i;
complex_perm_kinds_t candidates[4]
= { PERM_EVENODD
, PERM_ODDEVEN
, PERM_ODDODD
= { PERM_ODDODD
, PERM_EVENEVEN
, PERM_EVENODD
, PERM_ODDEVEN
};
int valid_patterns = 4;
FOR_EACH_VEC_ELT_FROM (loads, i, load, 1)
FOR_EACH_VEC_ELT (loads, i, load)
{
if (candidates[0] != PERM_UNKNOWN && load != i)
if (candidates[0] != PERM_UNKNOWN && load != 1)
{
candidates[0] = PERM_UNKNOWN;
valid_patterns--;
}
if (candidates[1] != PERM_UNKNOWN
&& load != (i % 2 == 0 ? i + 1 : i - 1))
if (candidates[1] != PERM_UNKNOWN && load != 0)
{
candidates[1] = PERM_UNKNOWN;
valid_patterns--;
}
if (candidates[2] != PERM_UNKNOWN && load != 1)
if (candidates[2] != PERM_UNKNOWN && load != i)
{
candidates[2] = PERM_UNKNOWN;
valid_patterns--;
}
if (candidates[3] != PERM_UNKNOWN && load != 0)
if (candidates[3] != PERM_UNKNOWN
&& load != (i % 2 == 0 ? i + 1 : i - 1))
{
candidates[3] = PERM_UNKNOWN;
valid_patterns--;