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File _service:tar_scm:0007-Vect-Enable-skipping-vectorization-on-reduction-chai.patch of Package gcc
From 07033bcc5b9e4c03846cd84b4587cd493fcf7d53 Mon Sep 17 00:00:00 2001 From: zhoukaipeng <zhoukaipeng3@huawei.com> Date: Wed, 14 Jul 2021 11:24:06 +0800 Subject: [PATCH 07/13] [Vect] Enable skipping vectorization on reduction chains Sometimes either vectorization on reduction chains or reductions is possible. But the latter is better. The option "-ftree-vect-analyze -slp-group" skips the former. diff --git a/gcc/common.opt b/gcc/common.opt index 8eb05570418..55d4eb5a351 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -2968,6 +2968,10 @@ ftree-slp-vectorize Common Report Var(flag_tree_slp_vectorize) Optimization EnabledBy(ftree-vectorize) Enable basic block vectorization (SLP) on trees. +ftree-vect-analyze-slp-group +Common Report Var(flag_tree_slp_group) Init(0) +Disable SLP vectorization for reduction chain on tree. + fvect-cost-model= Common Joined RejectNegative Enum(vect_cost_model) Var(flag_vect_cost_model) Init(VECT_COST_MODEL_DEFAULT) Optimization -fvect-cost-model=[unlimited|dynamic|cheap] Specifies the cost model for vectorization. diff --git a/gcc/testsuite/gcc.dg/vect/vect-reduc-12.c b/gcc/testsuite/gcc.dg/vect/vect-reduc-12.c new file mode 100644 index 00000000000..913f1ef28df --- /dev/null +++ b/gcc/testsuite/gcc.dg/vect/vect-reduc-12.c @@ -0,0 +1,20 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -ftree-vectorize -fdump-tree-vect-details -funsafe-math-optimizations -fno-tree-reassoc -ftree-vect-analyze-slp-group" } */ +void f(double *a, double *res, double m) { + double res1, res0; + res1 = 0; + res0 = 0; + for (int i = 0; i < 1000; i+=8) { + res0 += a[i] * m; + res1 += a[i+1] * m; + res0 += a[i+2] * m; + res1 += a[i+3] * m; + res0 += a[i+4] * m; + res1 += a[i+5] * m; + res0 += a[i+6] * m; + res1 += a[i+7] * m; + } + res[0] += res0; + res[1] += res1; +} +/* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" } } */ diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c index adc579ff544..476b3237054 100644 --- a/gcc/tree-vect-slp.c +++ b/gcc/tree-vect-slp.c @@ -2480,7 +2480,8 @@ vect_analyze_slp (vec_info *vinfo, unsigned max_tree_size) { /* Find SLP sequences starting from reduction chains. */ FOR_EACH_VEC_ELT (loop_vinfo->reduction_chains, i, first_element) - if (! vect_analyze_slp_instance (vinfo, bst_map, first_element, + if (flag_tree_slp_group + || ! vect_analyze_slp_instance (vinfo, bst_map, first_element, max_tree_size)) { /* Dissolve reduction chain group. */ -- 2.21.0.windows.1
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