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testsuite: XFAIL some SLP reduction tests for VLA SVE

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For variable-length SVE, we can only use SLP for N scalars of type
T if the number of Ts in a vector is a multiple of N.  For ints
this means that N must be 4 or 2, so this patch XFAILs two tests
for N==8.

The exact limit seems inherently target-specific -- variable-length
vectors with a 256-bit granule would work fine -- so I used aarch64_sve
selectors on the XFAILs.

gcc/testsuite/
	* gcc.dg/vect/slp-reduc-4.c: XFAIL test for SLP vectorization
	for variable-length SVE.
	* gcc.dg/vect/slp-reduc-7.c: Likewise.
This commit is contained in:
Richard Sandiford 2020-11-17 11:12:50 +00:00
parent e9cea0d6c8
commit a880fcc657
2 changed files with 8 additions and 4 deletions
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6
gcc/testsuite/gcc.dg/vect/slp-reduc-4.c
View File

@ -57,6 +57,8 @@ int main (void)
}
/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { xfail vect_no_int_min_max } } } */
/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 1 "vect" { xfail { vect_no_int_min_max || vect_variable_length } } } } */
/* { dg-final { scan-tree-dump-times "VEC_PERM_EXPR" 0 "vect" } } */
/* For variable-length SVE, the number of scalar statements in the
reduction exceeds the number of elements in a 128-bit granule. */
/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 1 "vect" { xfail { vect_no_int_min_max || { aarch64_sve && vect_variable_length } } } } } */
/* { dg-final { scan-tree-dump-times "VEC_PERM_EXPR" 0 "vect" { xfail { aarch64_sve && vect_variable_length } } } } */

6
gcc/testsuite/gcc.dg/vect/slp-reduc-7.c
View File

@ -55,5 +55,7 @@ int main (void)
}
/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { xfail vect_no_int_add } } } */
/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 1 "vect" { xfail { vect_no_int_add || vect_variable_length } } } } */
/* { dg-final { scan-tree-dump-times "VEC_PERM_EXPR" 0 "vect" } } */
/* For variable-length SVE, the number of scalar statements in the
reduction exceeds the number of elements in a 128-bit granule. */
/* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 1 "vect" { xfail { vect_no_int_add || { aarch64_sve && vect_variable_length } } } } } */
/* { dg-final { scan-tree-dump-times "VEC_PERM_EXPR" 0 "vect" { xfail { aarch64_sve && vect_variable_length } } } } */