From: Juzhe-Zhong <juzhe.zh...@rivai.ai>
gcc/ChangeLog:
* config/riscv/riscv-v.cc (rvv_builder::single_step_npatterns_p): Add
comment.
(shuffle_generic_patterns): Ditto.
(expand_vec_perm_const_1): Ditto.
---
gcc/config/riscv/riscv-v.cc | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/gcc/config/riscv/riscv-v.cc b/gcc/config/riscv/riscv-v.cc
index fb970344521..3ce2eb7f2ad 100644
--- a/gcc/config/riscv/riscv-v.cc
+++ b/gcc/config/riscv/riscv-v.cc
@@ -457,6 +457,9 @@ rvv_builder::single_step_npatterns_p () const
{ 2, 2, 2, 2, 4, 4, 4, 4, 8, 8, 8, 8, 16, 16, 16, 16, ... }
E.g. NPATTERNS = 8:
{ 2, 2, 2, 2, 2, 2, 2, 2, 8, 8, 8, 8, 8, 8, 8, 8, ... }
+ We only check ele[0] ~ ele[NPATTERNS - 1] whether they are the same.
+ We don't need to check the elements[n] with n >= NPATTERNS since
+ they don't belong to the same pattern.
*/
bool
rvv_builder::npatterns_all_equal_p () const
@@ -2478,6 +2481,8 @@ shuffle_generic_patterns (struct expand_vec_perm_d *d)
return true;
}
+/* This function recognizes and supports different permutation patterns
+ and enable VLA SLP auto-vectorization. */
static bool
expand_vec_perm_const_1 (struct expand_vec_perm_d *d)
{
@@ -2509,6 +2514,8 @@ expand_vec_perm_const_1 (struct expand_vec_perm_d *d)
return false;
}
+/* This function implements TARGET_VECTORIZE_VEC_PERM_CONST by using RVV
+ * instructions. */
bool
expand_vec_perm_const (machine_mode vmode, machine_mode op_mode, rtx target,
rtx op0, rtx op1, const vec_perm_indices &sel)
--
2.36.3
