On Thu, Mar 14, 2024 at 11:14 AM Tejas Belagod <tejas.bela...@arm.com> wrote:
>
>
> Ping.
>
> Thanks,
> Tejas.
>
> On 3/13/24 6:07 PM, Tejas Belagod wrote:
> > Ping!
> >
> > On 3/7/24 4:14 PM, Tejas Belagod wrote:
> >> This patch fixes a bug where vect_recog_abd_pattern called
> >> vect_convert_output
> >> with the incorrect vecitype for the corresponding pattern_stmt.
> >> vect_convert_output expects vecitype to be the vector form of the
> >> scalar type
> >> of the LHS of pattern_stmt, but we were passing in the vector form of
> >> the LHS
> >> of the new impending conversion statement. This caused a skew in ABD's
> >> pattern_stmt having the vectype of the following gimple pattern_stmt.
OK
> >> 2024-03-06 Tejas Belagod <tejas.bela...@arm.com>
> >>
> >> gcc/ChangeLog:
> >>
> >> PR middle-end/114108
> >> * tree-vect-patterns.cc (vect_recog_abd_pattern): Call
> >> vect_convert_output with the correct vecitype.
> >>
> >> gcc/testsuite/ChangeLog:
> >> * gcc.dg/vect/pr114108.c: New test.
> >> ---
> >> gcc/testsuite/gcc.dg/vect/pr114108.c | 19 +++++++++++++++++++
> >> gcc/tree-vect-patterns.cc | 5 ++---
> >> 2 files changed, 21 insertions(+), 3 deletions(-)
> >> create mode 100644 gcc/testsuite/gcc.dg/vect/pr114108.c
> >>
> >> diff --git a/gcc/testsuite/gcc.dg/vect/pr114108.c
> >> b/gcc/testsuite/gcc.dg/vect/pr114108.c
> >> new file mode 100644
> >> index 00000000000..b3075d41398
> >> --- /dev/null
> >> +++ b/gcc/testsuite/gcc.dg/vect/pr114108.c
> >> @@ -0,0 +1,19 @@
> >> +/* { dg-do compile } */
> >> +
> >> +#include "tree-vect.h"
> >> +
> >> +typedef signed char schar;
> >> +
> >> +__attribute__((noipa, noinline, optimize("O3")))
> >> +void foo(const schar *a, const schar *b, schar *c, int n)
> >> +{
> >> + for (int i = 0; i < n; i++)
> >> + {
> >> + unsigned u = __builtin_abs (a[i] - b[i]);
> >> + c[i] = u <= 7U ? u : 7U;
> >> + }
> >> +}
> >> +
> >> +
> >> +/* { dg-final { scan-tree-dump "LOOP VECTORIZED" "vect" { target
> >> aarch64*-*-* } } } */
> >> +/* { dg-final { scan-tree-dump "vect_recog_abd_pattern: detected"
> >> "vect" { target aarch64*-*-* } } } */
> >> diff --git a/gcc/tree-vect-patterns.cc b/gcc/tree-vect-patterns.cc
> >> index d562f57920f..4f491c6b833 100644
> >> --- a/gcc/tree-vect-patterns.cc
> >> +++ b/gcc/tree-vect-patterns.cc
> >> @@ -1576,9 +1576,8 @@ vect_recog_abd_pattern (vec_info *vinfo,
> >> && !TYPE_UNSIGNED (abd_out_type))
> >> {
> >> tree unsign = unsigned_type_for (abd_out_type);
> >> - tree unsign_vectype = get_vectype_for_scalar_type (vinfo, unsign);
> >> - stmt = vect_convert_output (vinfo, stmt_vinfo, unsign, stmt,
> >> - unsign_vectype);
> >> + stmt = vect_convert_output (vinfo, stmt_vinfo, unsign, stmt,
> >> vectype_out);
> >> + vectype_out = get_vectype_for_scalar_type (vinfo, unsign);
> >> }
> >> return vect_convert_output (vinfo, stmt_vinfo, out_type, stmt,
> >> vectype_out);
> >
>
