diff options
Diffstat (limited to 'gcc/optabs-query.c')
| -rw-r--r-- | gcc/optabs-query.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/gcc/optabs-query.c b/gcc/optabs-query.c index 440462b..02a583f 100644 --- a/gcc/optabs-query.c +++ b/gcc/optabs-query.c @@ -345,6 +345,22 @@ can_conditionally_move_p (machine_mode mode) return direct_optab_handler (movcc_optab, mode) != CODE_FOR_nothing; } +/* If a target doesn't implement a permute on a vector with multibyte + elements, we can try to do the same permute on byte elements. + If this makes sense for vector mode MODE then return the appropriate + byte vector mode. */ + +opt_machine_mode +qimode_for_vec_perm (machine_mode mode) +{ + machine_mode qimode; + if (GET_MODE_INNER (mode) != QImode + && mode_for_vector (QImode, GET_MODE_SIZE (mode)).exists (&qimode) + && VECTOR_MODE_P (qimode)) + return qimode; + return opt_machine_mode (); +} + /* Return true if VEC_PERM_EXPR of arbitrary input vectors can be expanded using SIMD extensions of the CPU. SEL may be NULL, which stands for an unknown constant. Note that additional permutations @@ -375,9 +391,7 @@ can_vec_perm_p (machine_mode mode, bool variable, vec_perm_indices *sel) return true; /* We allow fallback to a QI vector mode, and adjust the mask. */ - if (GET_MODE_INNER (mode) == QImode - || !mode_for_vector (QImode, GET_MODE_SIZE (mode)).exists (&qimode) - || !VECTOR_MODE_P (qimode)) + if (!qimode_for_vec_perm (mode).exists (&qimode)) return false; /* ??? For completeness, we ought to check the QImode version of |