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| author | Richard Sandiford <richard.sandiford@linaro.org> | 2018-01-02 18:25:45 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2018-01-02 18:25:45 +0000 |
| commit | 3ea109a3479cdbbe8a47bf60b2d2d69072a1d51b (patch) | |
| tree | 97ee41fba95472080036586c5de1b5d4ed707397 /gcc/optabs-query.c | |
| parent | a1d6c05238093d4de85dc18f825ba4f5e3a5746c (diff) | |
| download | gcc-3ea109a3479cdbbe8a47bf60b2d2d69072a1d51b.zip gcc-3ea109a3479cdbbe8a47bf60b2d2d69072a1d51b.tar.gz gcc-3ea109a3479cdbbe8a47bf60b2d2d69072a1d51b.tar.bz2 | |
The vec_perm code falls back to doing byte-level permutes if element-level permutes aren't supported.
qimode_for_vec_perm
The vec_perm code falls back to doing byte-level permutes if
element-level permutes aren't supported. There were two copies
of the code to calculate the mode, and later patches add another,
so this patch splits it out into a helper function.
2018-01-02 Richard Sandiford <richard.sandiford@linaro.org>
gcc/
* optabs-query.h (qimode_for_vec_perm): Declare.
* optabs-query.c (can_vec_perm_p): Split out qimode search to...
(qimode_for_vec_perm): ...this new function.
* optabs.c (expand_vec_perm): Use qimode_for_vec_perm.
From-SVN: r256089
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 |