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RISC-V: autovec: Verify that GET_MODE_NUNITS is a multiple of 2.

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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.
This commit is contained in:
Michael Collison
2023-05-06 12:37:50 -06:00
committed by Jeff Law
parent 9217e0dde1
commit 730909fa85
1 changed files with 5 additions and 2 deletions
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7
gcc/tree-vect-slp.cc
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@@ -423,10 +423,13 @@ 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
@@ -434,7 +437,7 @@ 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);