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re PR target/85491 (nbench LU Decomposition test 15% slower than GCC 7, 30% slower than peak)

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2018-04-24  Richard Biener  <rguenther@suse.de>

	PR target/85491
	* config/i386/i386.c (ix86_add_stmt_cost): Restrict strided
	load cost increase to the case of non-constant step.

From-SVN: r259592
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Richard Biener 2018-04-24 08:46:55 +00:00 committed by Richard Biener
parent b72139eac2
commit 4149dd37d9
2 changed files with 9 additions and 2 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-04-24 Richard Biener <rguenther@suse.de>
PR target/85491
* config/i386/i386.c (ix86_add_stmt_cost): Restrict strided
load cost increase to the case of non-constant step.
2018-04-24 Jakub Jelinek <jakub@redhat.com>
PR target/84828

5
gcc/config/i386/i386.c
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@ -50550,8 +50550,9 @@ ix86_add_stmt_cost (void *data, int count, enum vect_cost_for_stmt kind,
construction cost by the number of elements involved. */
if (kind == vec_construct
&& stmt_info
&& stmt_info->type == load_vec_info_type
&& stmt_info->memory_access_type == VMAT_ELEMENTWISE)
&& STMT_VINFO_TYPE (stmt_info) == load_vec_info_type
&& STMT_VINFO_MEMORY_ACCESS_TYPE (stmt_info) == VMAT_ELEMENTWISE
&& TREE_CODE (DR_STEP (STMT_VINFO_DATA_REF (stmt_info))) != INTEGER_CST)
{
stmt_cost = ix86_builtin_vectorization_cost (kind, vectype, misalign);
stmt_cost *= TYPE_VECTOR_SUBPARTS (vectype);