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tree-optimization/101026 - fix SLP re-association

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Since we cannot yet encode the operation in the SLP node itself
but need a representative stmt require an existing one for now
to avoid the need to build a fake GIMPLE stmt.

2021-06-11  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/101026
	* tree-vect-slp.c (vect_build_slp_tree_2): Make sure we
	have a representative for the associated chain nodes.

	* gfortran.dg/pr101026.f: New testcase.
This commit is contained in:
Richard Biener 2021-06-11 13:33:17 +02:00
parent 4bdcdd8fa8
commit fbd8a80412
2 changed files with 14 additions and 1 deletions
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11
gcc/testsuite/gfortran.dg/pr101026.f Normal file
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@ -0,0 +1,11 @@
! { dg-do compile }
! { dg-options "-Ofast -frounding-math" }
SUBROUTINE PASSB4 (CC,CH)
DIMENSION CC(IDO,4,L1), CH(IDO,L1,*)
DO 103 I=2,IDO,2
TI4 = CC0-CC(I,4,K)
CI4 = TI1-TI4
CH(I-1,K,4) = CI4
CH(I,K,4) = CI4
103 CONTINUE
END

4
gcc/tree-vect-slp.c
View file

@ -1860,7 +1860,9 @@ vect_build_slp_tree_2 (vec_info *vinfo, slp_tree node,
chains.quick_push (chain.copy ());
chain.truncate (0);
}
if (chains.length () == group_size)
if (chains.length () == group_size
/* We cannot yet use SLP_TREE_CODE to communicate the operation. */
&& op_stmt_info)
{
/* Now we have a set of chains with the same length. */
/* 1. pre-sort according to def_type and operation. */