Skip to content

R
riscv-gcc-1
Commit f4a74d27 by Richard Biener Committed by Richard Biener
Options

re PR tree-optimization/92645 (Hand written vector code is 450 times slower when… 

re PR tree-optimization/92645 (Hand written vector code is 450 times slower when compiled with GCC compared to Clang)

2019-11-26  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92645
	* tree-vect-slp.c (vect_build_slp_tree_2): For unary ops
	do not build the operation from scalars if the operand is.

	* gcc.target/i386/pr92645.c: New testcase.

From-SVN: r278719
parent 59d37e97
Showing with 55 additions and 6 deletions
gcc/ChangeLog
2019-11-26 Richard Biener <rguenther@suse.de>
PR tree-optimization/92645
* tree-vect-slp.c (vect_build_slp_tree_2): For unary ops
do not build the operation from scalars if the operand is.
2019-11-25 Tobias Burnus <tobias@codesourcery.com>
* config/gcn/mkoffload.c (COMMENT_PREFIX, struct id_map,
gcc/testsuite/ChangeLog
2019-11-26 Richard Biener <rguenther@suse.de>
PR tree-optimization/92645
* gcc.target/i386/pr92645.c: New testcase.
2019-11-26 Jakub Jelinek <jakub@redhat.com>
* gfortran.dg/dec-comparison.f90: Change dg-do from run to compile.
......
gcc/testsuite/gcc.target/i386/pr92645.c 0 → 100644
/* { dg-do compile } */
/* { dg-options "-O3 -fdump-tree-optimized -msse2 -Wno-psabi" } */
typedef unsigned short v8hi __attribute__((vector_size(16)));
typedef unsigned int v4si __attribute__((vector_size(16)));
void bar (v4si *dst, v8hi * __restrict src)
{
unsigned int tem[8];
tem[0] = (*src)[0];
tem[1] = (*src)[1];
tem[2] = (*src)[2];
tem[3] = (*src)[3];
tem[4] = (*src)[4];
tem[5] = (*src)[5];
tem[6] = (*src)[6];
tem[7] = (*src)[7];
dst[0] = *(v4si *)tem;
dst[1] = *(v4si *)&tem[4];
}
void foo (v4si *dst, v8hi src)
{
unsigned int tem[8];
tem[0] = src[0];
tem[1] = src[1];
tem[2] = src[2];
tem[3] = src[3];
tem[4] = src[4];
tem[5] = src[5];
tem[6] = src[6];
tem[7] = src[7];
dst[0] = *(v4si *)tem;
dst[1] = *(v4si *)&tem[4];
}
/* { dg-final { scan-tree-dump-times "vec_unpack_" 4 "optimized" } } */
gcc/tree-vect-slp.c
......@@ -1410,10 +1410,11 @@ vect_build_slp_tree_2 (vec_info *vinfo,
matches, npermutes,
&this_tree_size, bst_map)) != NULL)
{
/* If we have all children of child built up from scalars then just
throw that away and build it up this node from scalars. */
/* If we have all children of a non-unary child built up from
scalars then just throw that away and build it up this node
from scalars. */
if (is_a <bb_vec_info> (vinfo)
&& !SLP_TREE_CHILDREN (child).is_empty ()
&& SLP_TREE_CHILDREN (child).length () > 1
/* ??? Rejecting patterns this way doesn't work. We'd have to
do extra work to cancel the pattern so the uses see the
scalar version. */
......@@ -1549,10 +1550,11 @@ vect_build_slp_tree_2 (vec_info *vinfo,
tem, npermutes,
&this_tree_size, bst_map)) != NULL)
{
/* If we have all children of child built up from scalars then
just throw that away and build it up this node from scalars. */
/* If we have all children of a non-unary child built up from
scalars then just throw that away and build it up this node
from scalars. */
if (is_a <bb_vec_info> (vinfo)
&& !SLP_TREE_CHILDREN (child).is_empty ()
&& SLP_TREE_CHILDREN (child).length () > 1
/* ??? Rejecting patterns this way doesn't work. We'd have
to do extra work to cancel the pattern so the uses see the
scalar version. */
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment