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charset=utf-8 Content-Disposition: inline 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 (dot_prod): Correct RTL. --- inline copy of patch -- diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md index 7397f1ec5ca0cb9e3cdd5c46772f604e640666e4..51789f954affd9fa88e2bc1bcc3dacf64ccb5bde 100644 --- a/gcc/config/aarch64/aarch64-simd.md +++ b/gcc/config/aarch64/aarch64-simd.md @@ -635,18 +635,12 @@ (define_insn "aarch64_usdot" ;; and so the vectorizer provides r, in which the result has to be accumulated. (define_expand "dot_prod" [(set (match_operand:VS 0 "register_operand") - (plus:VS (unspec:VS [(match_operand: 1 "register_operand") + (plus:VS (match_operand:VS 3 "register_operand") + (unspec:VS [(match_operand: 1 "register_operand") (match_operand: 2 "register_operand")] - DOTPROD) - (match_operand:VS 3 "register_operand")))] + DOTPROD)))] "TARGET_DOTPROD" -{ - emit_insn ( - gen_aarch64_dot (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. -- --LZvS9be/3tNcYl/X Content-Type: text/x-diff; charset=utf-8 Content-Disposition: attachment; filename="rb14660.patch" diff --git a/gcc/config/aarch64/aarch64-simd.md b/gcc/config/aarch64/aarch64-simd.md index 7397f1ec5ca0cb9e3cdd5c46772f604e640666e4..51789f954affd9fa88e2bc1bcc3dacf64ccb5bde 100644 --- a/gcc/config/aarch64/aarch64-simd.md +++ b/gcc/config/aarch64/aarch64-simd.md @@ -635,18 +635,12 @@ (define_insn "aarch64_usdot" ;; and so the vectorizer provides r, in which the result has to be accumulated. (define_expand "dot_prod" [(set (match_operand:VS 0 "register_operand") - (plus:VS (unspec:VS [(match_operand: 1 "register_operand") + (plus:VS (match_operand:VS 3 "register_operand") + (unspec:VS [(match_operand: 1 "register_operand") (match_operand: 2 "register_operand")] - DOTPROD) - (match_operand:VS 3 "register_operand")))] + DOTPROD)))] "TARGET_DOTPROD" -{ - emit_insn ( - gen_aarch64_dot (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. --LZvS9be/3tNcYl/X--