Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.

Ok for master?
Thanks,
Tamar

gcc/ChangeLog:

        * config/aarch64/aarch64-simd-builtins.def (sdot, udot): Rename to..
        (sdot_prod, udot_prod): ... This.
        * config/aarch64/aarch64-simd.md (aarch64_<sur>dot<vsi2qi>): Merged
        into...
        (<sur>dot_prod<vsi2qi>): ... this.
        (aarch64_<sur>dot_lane<vsi2qi>, aarch64_<sur>dot_laneq<vsi2qi>):
        Change operands order.
        (<sur>sadv16qi): Use new operands order.
        * config/aarch64/arm_neon.h (vdot_u32, vdotq_u32, vdot_s32,
        vdotq_s32): Use new RTL ordering.

--- inline copy of patch ---

diff --git a/gcc/config/aarch64/aarch64-simd-builtins.def 
b/gcc/config/aarch64/aarch64-simd-builtins.def
index 
3bb45a82945b143497035ec30d35543b2dad55a3..402453aa9bba5949da43c984c4603196b1efd092
 100644
--- a/gcc/config/aarch64/aarch64-simd-builtins.def
+++ b/gcc/config/aarch64/aarch64-simd-builtins.def
@@ -375,8 +375,8 @@
   BUILTIN_VSDQ_I_DI (BINOP_UUS, urshl, 0, NONE)
 
   /* Implemented by <sur><dotprod>_prod<dot_mode>.  */
-  BUILTIN_VB (TERNOP, sdot, 0, NONE)
-  BUILTIN_VB (TERNOPU, udot, 0, NONE)
+  BUILTIN_VB (TERNOP, sdot_prod, 10, NONE)
+  BUILTIN_VB (TERNOPU, udot_prod, 10, NONE)
   BUILTIN_VB (TERNOP_SUSS, usdot_prod, 10, NONE)
   /* Implemented by aarch64_<sur><dotprod>_lane{q}<dot_mode>.  */
   BUILTIN_VB (QUADOP_LANE, sdot_lane, 0, NONE)
diff --git a/gcc/config/aarch64/aarch64-simd.md 
b/gcc/config/aarch64/aarch64-simd.md
index 
bf667b99944e3fcce618a21c77bd5b804b3a0b5d..13c86984df147f2033b81a2a5278252f5ac52779
 100644
--- a/gcc/config/aarch64/aarch64-simd.md
+++ b/gcc/config/aarch64/aarch64-simd.md
@@ -587,19 +587,8 @@ (define_expand "cmul<conj_op><mode>3"
   DONE;
 })
 
-;; These instructions map to the __builtins for the Dot Product operations.
-(define_insn "aarch64_<sur>dot<vsi2qi>"
-  [(set (match_operand:VS 0 "register_operand" "=w")
-       (plus:VS (match_operand:VS 1 "register_operand" "0")
-               (unspec:VS [(match_operand:<VSI2QI> 2 "register_operand" "w")
-                           (match_operand:<VSI2QI> 3 "register_operand" "w")]
-               DOTPROD)))]
-  "TARGET_DOTPROD"
-  "<sur>dot\\t%0.<Vtype>, %2.<Vdottype>, %3.<Vdottype>"
-  [(set_attr "type" "neon_dot<q>")]
-)
-
-;; These expands map to the Dot Product optab the vectorizer checks for.
+;; These expands map to the Dot Product optab the vectorizer checks for
+;; and to the intrinsics patttern.
 ;; The auto-vectorizer expects a dot product builtin that also does an
 ;; accumulation into the provided register.
 ;; Given the following pattern
@@ -619,20 +608,17 @@ (define_insn "aarch64_<sur>dot<vsi2qi>"
 ;; ...
 ;;
 ;; and so the vectorizer provides r, in which the result has to be accumulated.
-(define_expand "<sur>dot_prod<vsi2qi>"
-  [(set (match_operand:VS 0 "register_operand")
-       (plus:VS (unspec:VS [(match_operand:<VSI2QI> 1 "register_operand")
-                           (match_operand:<VSI2QI> 2 "register_operand")]
-                DOTPROD)
-               (match_operand:VS 3 "register_operand")))]
+(define_insn "<sur>dot_prod<vsi2qi>"
+  [(set (match_operand:VS 0 "register_operand" "=w")
+       (plus:VS
+         (unspec:VS [(match_operand:<VSI2QI> 1 "register_operand" "w")
+                     (match_operand:<VSI2QI> 2 "register_operand" "w")]
+                     DOTPROD)
+         (match_operand:VS 3 "register_operand" "0")))]
   "TARGET_DOTPROD"
-{
-  emit_insn (
-    gen_aarch64_<sur>dot<vsi2qi> (operands[3], operands[3], operands[1],
-                                   operands[2]));
-  emit_insn (gen_rtx_SET (operands[0], operands[3]));
-  DONE;
-})
+  "<sur>dot\\t%0.<Vtype>, %1.<Vdottype>, %2.<Vdottype>"
+  [(set_attr "type" "neon_dot<q>")]
+)
 
 ;; These instructions map to the __builtins for the Armv8.6-a I8MM usdot
 ;; (vector) Dot Product operation and the vectorized optab.
@@ -652,11 +638,12 @@ (define_insn "usdot_prod<vsi2qi>"
 ;; indexed operations.
 (define_insn "aarch64_<sur>dot_lane<vsi2qi>"
   [(set (match_operand:VS 0 "register_operand" "=w")
-       (plus:VS (match_operand:VS 1 "register_operand" "0")
-               (unspec:VS [(match_operand:<VSI2QI> 2 "register_operand" "w")
-                           (match_operand:V8QI 3 "register_operand" "<h_con>")
-                           (match_operand:SI 4 "immediate_operand" "i")]
-               DOTPROD)))]
+       (plus:VS
+         (unspec:VS [(match_operand:<VSI2QI> 2 "register_operand" "w")
+                     (match_operand:V8QI 3 "register_operand" "<h_con>")
+                     (match_operand:SI 4 "immediate_operand" "i")]
+                     DOTPROD)
+         (match_operand:VS 1 "register_operand" "0")))]
   "TARGET_DOTPROD"
   {
     operands[4] = aarch64_endian_lane_rtx (V8QImode, INTVAL (operands[4]));
@@ -667,11 +654,12 @@ (define_insn "aarch64_<sur>dot_lane<vsi2qi>"
 
 (define_insn "aarch64_<sur>dot_laneq<vsi2qi>"
   [(set (match_operand:VS 0 "register_operand" "=w")
-       (plus:VS (match_operand:VS 1 "register_operand" "0")
-               (unspec:VS [(match_operand:<VSI2QI> 2 "register_operand" "w")
-                           (match_operand:V16QI 3 "register_operand" "<h_con>")
-                           (match_operand:SI 4 "immediate_operand" "i")]
-               DOTPROD)))]
+       (plus:VS
+         (unspec:VS [(match_operand:<VSI2QI> 2 "register_operand" "w")
+                     (match_operand:V16QI 3 "register_operand" "<h_con>")
+                     (match_operand:SI 4 "immediate_operand" "i")]
+                     DOTPROD)
+         (match_operand:VS 1 "register_operand" "0")))]
   "TARGET_DOTPROD"
   {
     operands[4] = aarch64_endian_lane_rtx (V16QImode, INTVAL (operands[4]));
@@ -944,8 +932,7 @@ (define_expand "<sur>sadv16qi"
        rtx ones = force_reg (V16QImode, CONST1_RTX (V16QImode));
        rtx abd = gen_reg_rtx (V16QImode);
        emit_insn (gen_aarch64_<sur>abdv16qi (abd, operands[1], operands[2]));
-       emit_insn (gen_aarch64_udotv16qi (operands[0], operands[3],
-                                         abd, ones));
+       emit_insn (gen_udot_prodv16qi (operands[0], abd, ones, operands[3]));
        DONE;
       }
     rtx reduc = gen_reg_rtx (V8HImode);
diff --git a/gcc/config/aarch64/arm_neon.h b/gcc/config/aarch64/arm_neon.h
index 
8396e872580bc9fb32b872f3915485b02ec2b334..08bede79ad252b3728fdb278036a4de73696a5db
 100644
--- a/gcc/config/aarch64/arm_neon.h
+++ b/gcc/config/aarch64/arm_neon.h
@@ -31749,28 +31749,28 @@ __extension__ extern __inline uint32x2_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vdot_u32 (uint32x2_t __r, uint8x8_t __a, uint8x8_t __b)
 {
-  return __builtin_aarch64_udotv8qi_uuuu (__r, __a, __b);
+  return __builtin_aarch64_udot_prodv8qi_uuuu (__a, __b, __r);
 }
 
 __extension__ extern __inline uint32x4_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vdotq_u32 (uint32x4_t __r, uint8x16_t __a, uint8x16_t __b)
 {
-  return __builtin_aarch64_udotv16qi_uuuu (__r, __a, __b);
+  return __builtin_aarch64_udot_prodv16qi_uuuu (__a, __b, __r);
 }
 
 __extension__ extern __inline int32x2_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vdot_s32 (int32x2_t __r, int8x8_t __a, int8x8_t __b)
 {
-  return __builtin_aarch64_sdotv8qi (__r, __a, __b);
+  return __builtin_aarch64_sdot_prodv8qi (__a, __b, __r);
 }
 
 __extension__ extern __inline int32x4_t
 __attribute__ ((__always_inline__, __gnu_inline__, __artificial__))
 vdotq_s32 (int32x4_t __r, int8x16_t __a, int8x16_t __b)
 {
-  return __builtin_aarch64_sdotv16qi (__r, __a, __b);
+  return __builtin_aarch64_sdot_prodv16qi (__a, __b, __r);
 }
 
 __extension__ extern __inline uint32x2_t

> -----Original Message-----
> From: Richard Sandiford <richard.sandif...@arm.com>
> Sent: Thursday, July 15, 2021 8:45 PM
> To: Tamar Christina <tamar.christ...@arm.com>
> Cc: gcc-patches@gcc.gnu.org; nd <n...@arm.com>; Richard Earnshaw
> <richard.earns...@arm.com>; Marcus Shawcroft
> <marcus.shawcr...@arm.com>; Kyrylo Tkachov <kyrylo.tkac...@arm.com>
> Subject: Re: [PATCH 3/4]AArch64: correct dot-product RTL patterns for
> aarch64.
> 
> Tamar Christina <tamar.christ...@arm.com> writes:
> > Hi All,
> >
> > The previous fix for this problem was wrong due to a subtle difference
> > between where NEON expects the RMW values and where intrinsics
> expects them.
> >
> > The insn pattern is modeled after the intrinsics and so needs an
> > expand for the vectorizer optab to switch the RTL.
> >
> > However operand[3] is not expected to be written to so the current
> > pattern is bogus.
> >
> > Instead we use the expand to shuffle around the RTL.
> >
> > The vectorizer expects operands[3] and operands[0] to be the same but
> > the aarch64 intrinsics expanders expect operands[0] and operands[1] to
> > be the same.
> >
> > Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.
> >
> > Ok for master? and active branches after some stew?
> >
> > Thanks,
> > Tamar
> >
> > gcc/ChangeLog:
> >
> >     * config/aarch64/aarch64-simd.md (<sur>dot_prod<vsi2qi>): Correct
> >     RTL.
> >
> > --- inline copy of patch --
> > diff --git a/gcc/config/aarch64/aarch64-simd.md
> > b/gcc/config/aarch64/aarch64-simd.md
> > index
> >
> 7397f1ec5ca0cb9e3cdd5c46772f604e640666e4..51789f954affd9fa88e2bc1bcc3
> d
> > acf64ccb5bde 100644
> > --- a/gcc/config/aarch64/aarch64-simd.md
> > +++ b/gcc/config/aarch64/aarch64-simd.md
> > @@ -635,18 +635,12 @@ (define_insn "aarch64_usdot<vsi2qi>"
> >  ;; and so the vectorizer provides r, in which the result has to be
> accumulated.
> >  (define_expand "<sur>dot_prod<vsi2qi>"
> >    [(set (match_operand:VS 0 "register_operand")
> > -   (plus:VS (unspec:VS [(match_operand:<VSI2QI> 1
> "register_operand")
> > +   (plus:VS (match_operand:VS 3 "register_operand")
> > +            (unspec:VS [(match_operand:<VSI2QI> 1
> "register_operand")
> >                         (match_operand:<VSI2QI> 2 "register_operand")]
> > -            DOTPROD)
> > -           (match_operand:VS 3 "register_operand")))]
> > +            DOTPROD)))]
> >    "TARGET_DOTPROD"
> 
> The canonical plus: operand order was the original one, so I think it would be
> better to keep this rtl as-is and instead change aarch64_<sur>dot<vsi2qi> to:
> 
>       (plus:VS (unspec:VS [(match_operand:<VSI2QI> 2
> "register_operand" "w")
>                            (match_operand:<VSI2QI> 3 "register_operand"
> "w")]
>                           DOTPROD)
>                (match_operand:VS 1 "register_operand" "0"))
> 
> Same idea for aarch64_<sur>dot_lane<vsi2qi> and
> aarch64_<sur>dot_laneq<vsi2qi>.
> 
> Sorry to be awkward…
> 
> Thanks,
> Richard
> 
> > -{
> > -  emit_insn (
> > -    gen_aarch64_<sur>dot<vsi2qi> (operands[3], operands[3], operands[1],
> > -                               operands[2]));
> > -  emit_insn (gen_rtx_SET (operands[0], operands[3]));
> > -  DONE;
> > -})
> > +)
> >
> >  ;; Auto-vectorizer pattern for usdot.  The operand[3] and operand[0]
> > are the  ;; RMW parameters that when it comes to the vectorizer.

Attachment: rb14660.patch
Description: rb14660.patch

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