[PATCH] vect: Fix vect_is_reduction

Richard Biener richard.guenther@gmail.com
Fri Nov 12 19:03:57 GMT 2021


On November 12, 2021 6:54:29 PM GMT+01:00, Richard Sandiford via Gcc-patches <gcc-patches@gcc.gnu.org> wrote:
>The current definition of vect_is_reduction (provided for target
>costing) misses some pattern statements.
>
>Regstrapped on aarch64-linux-gnu and x86_64-linux-gnu.  OK to install?

This now will return true for all stmts on the reduction path (not sure for the PHI node though) 

Ok if that's intentional. 

Richard. 

>Richard
>
>
>gcc/
>	* tree-vectorizer.h (vect_is_reduction): Use STMT_VINFO_REDUC_IDX.
>
>gcc/testsuite/
>	* gcc.target/aarch64/sve/cost_model_13.c: New test.
>---
> .../gcc.target/aarch64/sve/cost_model_13.c       | 16 ++++++++++++++++
> gcc/tree-vectorizer.h                            |  3 +--
> 2 files changed, 17 insertions(+), 2 deletions(-)
> create mode 100644 gcc/testsuite/gcc.target/aarch64/sve/cost_model_13.c
>
>diff --git a/gcc/testsuite/gcc.target/aarch64/sve/cost_model_13.c b/gcc/testsuite/gcc.target/aarch64/sve/cost_model_13.c
>new file mode 100644
>index 00000000000..95f2ce91f80
>--- /dev/null
>+++ b/gcc/testsuite/gcc.target/aarch64/sve/cost_model_13.c
>@@ -0,0 +1,16 @@
>+/* { dg-options "-O3 -mtune=neoverse-v1" } */
>+
>+int
>+f11 (short *restrict x, int n)
>+{
>+  short res = 0;
>+  for (int i = 0; i < n; ++i)
>+    res += x[i];
>+  return res;
>+}
>+
>+/* We should use SVE rather than Advanced SIMD.  */
>+/* { dg-final { scan-assembler {\tld1h\tz[0-9]+\.h,} } } */
>+/* { dg-final { scan-assembler {\tadd\tz[0-9]+\.h,} } } */
>+/* { dg-final { scan-assembler-not {\tldr\tq[0-9]+,} } } */
>+/* { dg-final { scan-assembler-not {\tv[0-9]+\.8h,} } } */
>diff --git a/gcc/tree-vectorizer.h b/gcc/tree-vectorizer.h
>index 0eb13d6cc74..76e81ea546a 100644
>--- a/gcc/tree-vectorizer.h
>+++ b/gcc/tree-vectorizer.h
>@@ -2372,8 +2372,7 @@ vect_is_store_elt_extraction (vect_cost_for_stmt kind, stmt_vec_info stmt_info)
> inline bool
> vect_is_reduction (stmt_vec_info stmt_info)
> {
>-  return (STMT_VINFO_REDUC_DEF (stmt_info)
>-	  || VECTORIZABLE_CYCLE_DEF (STMT_VINFO_DEF_TYPE (stmt_info)));
>+  return STMT_VINFO_REDUC_IDX (stmt_info) >= 0;
> }
> 
> /* If STMT_INFO describes a reduction, return the vect_reduction_type



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