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From a3b4a0ac472415a52ce836e8997f7a69a06fad33 Mon Sep 17 00:00:00 2001
From: Michael Collison <collison@rivosinc.com>
Date: Sat, 6 May 2023 12:37:50 -0600
Subject: [PATCH 149/157] [Backport][SME] RISC-V: autovec: Verify that
GET_MODE_NUNITS is a multiple of 2.
Reference: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=730909fa858bd691095bc23655077aa13b7941a9
While working on autovectorizing for the RISCV port I encountered an issue
where can_duplicate_and_interleave_p assumes that GET_MODE_NUNITS is a
evenly divisible by two. The RISC-V target has vector modes (e.g. VNx1DImode),
where GET_MODE_NUNITS is equal to one.
Tested on RISCV and x86_64-linux-gnu. Okay?
gcc/
* tree-vect-slp.cc (can_duplicate_and_interleave_p):
Check that GET_MODE_NUNITS is a multiple of 2.
---
gcc/tree-vect-slp.cc | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 6cbf8085f..d02f0ce37 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -401,10 +401,13 @@ can_duplicate_and_interleave_p (vec_info *vinfo, unsigned int count,
(GET_MODE_BITSIZE (int_mode), 1);
tree vector_type
= get_vectype_for_scalar_type (vinfo, int_type, count);
+ poly_int64 half_nelts;
if (vector_type
&& VECTOR_MODE_P (TYPE_MODE (vector_type))
&& known_eq (GET_MODE_SIZE (TYPE_MODE (vector_type)),
- GET_MODE_SIZE (base_vector_mode)))
+ GET_MODE_SIZE (base_vector_mode))
+ && multiple_p (GET_MODE_NUNITS (TYPE_MODE (vector_type)),
+ 2, &half_nelts))
{
/* Try fusing consecutive sequences of COUNT / NVECTORS elements
together into elements of type INT_TYPE and using the result
@@ -412,7 +415,7 @@ can_duplicate_and_interleave_p (vec_info *vinfo, unsigned int count,
poly_uint64 nelts = GET_MODE_NUNITS (TYPE_MODE (vector_type));
vec_perm_builder sel1 (nelts, 2, 3);
vec_perm_builder sel2 (nelts, 2, 3);
- poly_int64 half_nelts = exact_div (nelts, 2);
+
for (unsigned int i = 0; i < 3; ++i)
{
sel1.quick_push (i);
--
2.33.0
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