60 lines
2.0 KiB
Diff
60 lines
2.0 KiB
Diff
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This backport contains 1 patch from gcc main stream tree.
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The commit id of these patchs list as following in the order of time.
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0001-tree-vect-slp.c-vect_analyze_slp-When-reduction-grou.patch
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0214d31a48f867b9b00134cea7223d35ed7865aa
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diff --git a/gcc/testsuite/gcc.dg/vect/slp-reduc-9.c b/gcc/testsuite/gcc.dg/vect/slp-reduc-9.c
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new file mode 100644
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index 00000000000..bee642ee999
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--- /dev/null
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+++ b/gcc/testsuite/gcc.dg/vect/slp-reduc-9.c
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@@ -0,0 +1,25 @@
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+/* { dg-do compile } */
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+/* { dg-require-effective-target vect_int_mult } */
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+
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+int
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+bar (int *x, int a, int b, int n)
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+{
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+ x = __builtin_assume_aligned (x, __BIGGEST_ALIGNMENT__);
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+ int sum1 = 0;
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+ int sum2 = 0;
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+ for (int i = 0; i < n; ++i)
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+ {
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+ /* Reduction chain vectorization fails here because of the
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+ different operations but we can still vectorize both
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+ reductions as SLP reductions, saving IVs. */
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+ sum1 += x[2*i] - a;
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+ sum1 += x[2*i+1] * b;
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+ sum2 += x[2*i] - b;
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+ sum2 += x[2*i+1] * a;
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+ }
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+ return sum1 + sum2;
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+}
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+
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+/* { dg-final { scan-tree-dump "Loop contains only SLP stmts" "vect" } } */
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+/* { dg-final { scan-tree-dump "vectorizing stmts using SLP" "vect" } } */
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+/* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" } } */
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diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
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index e1061ede061..0af51197a84 100644
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--- a/gcc/tree-vect-slp.c
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+++ b/gcc/tree-vect-slp.c
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@@ -2271,14 +2271,18 @@ vect_analyze_slp (vec_info *vinfo, unsigned max_tree_size)
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{
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/* Dissolve reduction chain group. */
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stmt_vec_info vinfo = first_element;
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+ stmt_vec_info last = NULL;
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while (vinfo)
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{
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stmt_vec_info next = REDUC_GROUP_NEXT_ELEMENT (vinfo);
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REDUC_GROUP_FIRST_ELEMENT (vinfo) = NULL;
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REDUC_GROUP_NEXT_ELEMENT (vinfo) = NULL;
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+ last = vinfo;
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vinfo = next;
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}
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STMT_VINFO_DEF_TYPE (first_element) = vect_internal_def;
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+ /* It can be still vectorized as part of an SLP reduction. */
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+ loop_vinfo->reductions.safe_push (last);
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}
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}
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