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vect: Tighten check for SLP memory groups [PR103517]

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When checking for compatible stmts, vect_build_slp_tree_1 did:

	       && !(STMT_VINFO_GROUPED_ACCESS (stmt_info)
		    && (first_stmt_code == ARRAY_REF
			|| first_stmt_code == BIT_FIELD_REF
			|| first_stmt_code == INDIRECT_REF
			|| first_stmt_code == COMPONENT_REF
			|| first_stmt_code == MEM_REF)))

That is, it allowed any rhs_code as long as the first_stmt_code
looked valid.  This had the effect of allowing IFN_MASK_LOAD
to be paired with an earlier non-call code (but didn't allow
the reverse).

This patch makes the check symmetrical.

gcc/
	PR tree-optimization/103517
	* tree-vect-slp.c (vect_build_slp_tree_1): When allowing two
	different component references, check the codes of both them,
	rather than just the first.

gcc/testsuite/
	PR tree-optimization/103517
	* gcc.dg/vect/pr103517.c: New test.
This commit is contained in:
Richard Sandiford 2021-12-01 14:36:24 +00:00
parent cb137e8572
commit 1e625a44f6
2 changed files with 19 additions and 1 deletions
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13
gcc/testsuite/gcc.dg/vect/pr103517.c Normal file
View File

@ -0,0 +1,13 @@
/* { dg-do compile } */
/* { dg-additional-options "-march=skylake-avx512" { target x86_64-*-* i?86-*-* } } */
int a;
short b, c;
extern short d[];
void e() {
for (short f = 1; f < (short)a; f += 2)
if (d[f + 1]) {
b = d[f];
c = d[f + 1];
}
}

7
gcc/tree-vect-slp.c
View File

@ -1121,7 +1121,12 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char *swap,
|| first_stmt_code == BIT_FIELD_REF
|| first_stmt_code == INDIRECT_REF
|| first_stmt_code == COMPONENT_REF
|| first_stmt_code == MEM_REF)))
|| first_stmt_code == MEM_REF)
&& (rhs_code == ARRAY_REF
|| rhs_code == BIT_FIELD_REF
|| rhs_code == INDIRECT_REF
|| rhs_code == COMPONENT_REF
|| rhs_code == MEM_REF)))
|| first_stmt_load_p != load_p
|| first_stmt_phi_p != phi_p)
{