From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by sourceware.org (Postfix) with ESMTPS id 0B98538582B2 for ; Fri, 23 Sep 2022 07:21:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 0B98538582B2 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1663917673; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=gFDAc7Frjz3hVXb1/RCMg9VNbG5cKq0RDDQu0RNvc+0=; b=I/AJNQ/A3tUxqeC1nofokoK6e3xXO/4PK0M4Hlp/1SNouMx+27GlgIfZIP8MpDKGEDauaT OEpOb8ZARhK9uKy0t7yN6V64hiozs3yplJPw123Lt/RlpFpxDs37PxjekEt5Gfgx30kqgI kSidONE1OlohIhLyWBjAk22EylHxDcs= Received: from mail-oi1-f198.google.com (mail-oi1-f198.google.com [209.85.167.198]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-280-vzYYHd_NMS6TEDMB3Zz0wg-1; Fri, 23 Sep 2022 03:21:12 -0400 X-MC-Unique: vzYYHd_NMS6TEDMB3Zz0wg-1 Received: by mail-oi1-f198.google.com with SMTP id m21-20020a0568080f1500b00350c7fc362cso5649535oiw.11 for ; Fri, 23 Sep 2022 00:21:12 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date; bh=gFDAc7Frjz3hVXb1/RCMg9VNbG5cKq0RDDQu0RNvc+0=; b=6zM1eoidSmCTtyzFamaRPN+DoWac1b6u1lMEwyHaBIGdwByHrhXCYj9EbqhZw8QyT6 q9aKA5EKRKphnNs8fNTgQ9Gv6JnaWqg5PXfkXLpv4b7bXKdlfeyBc40/HexaGfFL7qol dZm9eNVzCiVfLVGRYF2dK8ClUnLhN6f+6zes5/PDKOojTtMywcg0iiTsmr0VVUd5Q6Fe BR/mnbG/bqAzxx9m5ZkBOP7YM2+7Iyxx9LU7kBtBJQeid7DGE/p/j2QsPbE4U51rrvpu hg6ggcRO2ySL2VmoNOA0NNMvAljORYZZWdMvF05weSeQCe5j3K5NMZkHksXDfWedJfva 3qig== X-Gm-Message-State: ACrzQf3cH3FYavUcKi2rJIBeroINpTaBKKz6cO76OCsI2Q5Cetd8FzSV w5RZSTuLMxePGluzDVT1+HY+oZO50ot57sKGAOH3s4oFeetjSCCDH0lHgFaiSbTycxsB6g9i0Qn dciS1E5rotbeStH6S9hkf6B4o9Ah6MoVZfA== X-Received: by 2002:a05:6830:4492:b0:65a:116c:63e4 with SMTP id r18-20020a056830449200b0065a116c63e4mr3517791otv.335.1663917671377; Fri, 23 Sep 2022 00:21:11 -0700 (PDT) X-Google-Smtp-Source: AMsMyM5AX8/hJQTZ5N5kgxD1hxxdh0I4xJSAFfBOAAm4M1tZE+7kXwb/RsHJLHCLwNbh2oieFO4xwFqM4GO96eJjNuI= X-Received: by 2002:a05:6830:4492:b0:65a:116c:63e4 with SMTP id r18-20020a056830449200b0065a116c63e4mr3517779otv.335.1663917671064; Fri, 23 Sep 2022 00:21:11 -0700 (PDT) MIME-Version: 1.0 References: <20220922164911.2566143-1-aldyh@redhat.com> <20220922164911.2566143-2-aldyh@redhat.com> In-Reply-To: From: Aldy Hernandez Date: Fri, 23 Sep 2022 09:21:00 +0200 Message-ID: Subject: Re: [PATCH] frange: drop endpoints to min/max representable numbers for -ffinite-math-only. To: Richard Biener Cc: GCC patches , Jakub Jelinek , Andrew MacLeod X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/mixed; boundary="000000000000b85f4e05e95305da" X-Spam-Status: No, score=-12.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,RCVD_IN_DNSWL_LOW,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: --000000000000b85f4e05e95305da Content-Type: text/plain; charset="UTF-8" Ughhh, my bad. I had reworked this as soon as Jakub said we couldn't cache the min/max in TYPE_MIN/MAX_VALUE, but forgot to send it. And yes...the incessant wrapping was very annoying. It's all fixed. Let me know what you think. Aldy On Fri, Sep 23, 2022 at 9:04 AM Richard Biener wrote: > > On Thu, Sep 22, 2022 at 6:49 PM Aldy Hernandez wrote: > > > > Similarly to how we drop NANs to UNDEFINED when -ffinite-math-only, I > > think we can drop the numbers outside of the min/max representable > > numbers to the representable number. > > > > This means the endpoings to VR_VARYING for -ffinite-math-only can now > > be the min/max representable, instead of -INF and +INF. > > > > Saturating in the setter means that the upcoming implementation for > > binary operators no longer have to worry about doing the right > > thing for -ffinite-math-only. If the range goes outside the limits, > > it'll get chopped down. > > > > How does this look? > > > > Tested on x86-64 Linux. > > > > gcc/ChangeLog: > > > > * range-op-float.cc (build_le): Use vrp_val_*. > > (build_lt): Same. > > (build_ge): Same. > > (build_gt): Same. > > * value-range.cc (frange::set): Chop ranges outside of the > > representable numbers for -ffinite-math-only. > > (frange::normalize_kind): Use vrp_val*. > > (frange::verify_range): Same. > > (frange::set_nonnegative): Same. > > (range_tests_floats): Remove tests that depend on -INF and +INF. > > * value-range.h (real_max_representable): Add prototype. > > (real_min_representable): Same. > > (vrp_val_max): Set max representable number for > > -ffinite-math-only. > > (vrp_val_min): Same but for min. > > (frange::set_varying): Use vrp_val*. > > --- > > gcc/range-op-float.cc | 12 +++++++---- > > gcc/value-range.cc | 46 ++++++++++++++++++++----------------------- > > gcc/value-range.h | 30 ++++++++++++++++++++++------ > > 3 files changed, 53 insertions(+), 35 deletions(-) > > > > diff --git a/gcc/range-op-float.cc b/gcc/range-op-float.cc > > index 2bd3dc9253f..15ba19c2deb 100644 > > --- a/gcc/range-op-float.cc > > +++ b/gcc/range-op-float.cc > > @@ -232,7 +232,8 @@ build_le (frange &r, tree type, const frange &val) > > { > > gcc_checking_assert (!val.known_isnan ()); > > > > - r.set (type, dconstninf, val.upper_bound ()); > > + REAL_VALUE_TYPE ninf = *TREE_REAL_CST_PTR (vrp_val_min (type)); > > + r.set (type, ninf, val.upper_bound ()); > > > > // Add both zeros if there's the possibility of zero equality. > > frange_add_zeros (r, type); > > @@ -257,7 +258,8 @@ build_lt (frange &r, tree type, const frange &val) > > return false; > > } > > // We only support closed intervals. > > - r.set (type, dconstninf, val.upper_bound ()); > > + REAL_VALUE_TYPE ninf = *TREE_REAL_CST_PTR (vrp_val_min (type)); > > + r.set (type, ninf, val.upper_bound ()); > > return true; > > } > > > > @@ -268,7 +270,8 @@ build_ge (frange &r, tree type, const frange &val) > > { > > gcc_checking_assert (!val.known_isnan ()); > > > > - r.set (type, val.lower_bound (), dconstinf); > > + REAL_VALUE_TYPE inf = *TREE_REAL_CST_PTR (vrp_val_max (type)); > > + r.set (type, val.lower_bound (), inf); > > > > // Add both zeros if there's the possibility of zero equality. > > frange_add_zeros (r, type); > > @@ -294,7 +297,8 @@ build_gt (frange &r, tree type, const frange &val) > > } > > > > // We only support closed intervals. > > - r.set (type, val.lower_bound (), dconstinf); > > + REAL_VALUE_TYPE inf = *TREE_REAL_CST_PTR (vrp_val_max (type)); > > + r.set (type, val.lower_bound (), inf); > > return true; > > } > > > > diff --git a/gcc/value-range.cc b/gcc/value-range.cc > > index 7e8028eced2..e57d60e1bac 100644 > > --- a/gcc/value-range.cc > > +++ b/gcc/value-range.cc > > @@ -338,6 +338,18 @@ frange::set (tree min, tree max, value_range_kind kind) > > m_neg_nan = false; > > } > > > > + // For -ffinite-math-only we can drop ranges outside the > > + // representable numbers to min/max for the type. > > + if (flag_finite_math_only) > > + { > > + REAL_VALUE_TYPE min_repr = *TREE_REAL_CST_PTR (vrp_val_min (m_type)); > > + REAL_VALUE_TYPE max_repr = *TREE_REAL_CST_PTR (vrp_val_max (m_type)); > > + if (real_less (&m_min, &min_repr)) > > + m_min = min_repr; > > + if (real_less (&max_repr, &m_max)) > > + m_max = max_repr; > > I think you want to re-formulate that in terms of real_isinf() and > change those to the max representable values. > > > + } > > + > > // Check for swapped ranges. > > gcc_checking_assert (tree_compare (LE_EXPR, min, max)); > > > > @@ -371,8 +383,8 @@ bool > > frange::normalize_kind () > > { > > if (m_kind == VR_RANGE > > - && real_isinf (&m_min, 1) > > - && real_isinf (&m_max, 0)) > > + && vrp_val_is_min (build_real (m_type, m_min)) > > + && vrp_val_is_max (build_real (m_type, m_max))) > > I think this suggests that keeping +-Inf might be the better choice. > At least you want to change vrp_val_is_min/max to take a REAL_VALUE_TYPE > to avoid building four tree nodes for just this compare? > > > { > > if (m_pos_nan && m_neg_nan) > > { > > @@ -385,8 +397,8 @@ frange::normalize_kind () > > if (!m_pos_nan || !m_neg_nan) > > { > > m_kind = VR_RANGE; > > - m_min = dconstninf; > > - m_max = dconstinf; > > + m_min = *TREE_REAL_CST_PTR (vrp_val_min (m_type)); > > + m_max = *TREE_REAL_CST_PTR (vrp_val_max (m_type)); > > return true; > > } > > } > > @@ -706,8 +718,8 @@ frange::verify_range () > > case VR_VARYING: > > gcc_checking_assert (m_type); > > gcc_checking_assert (m_pos_nan && m_neg_nan); > > - gcc_checking_assert (real_isinf (&m_min, 1)); > > - gcc_checking_assert (real_isinf (&m_max, 0)); > > + gcc_checking_assert (vrp_val_is_min (build_real (m_type, m_min))); > > + gcc_checking_assert (vrp_val_is_max (build_real (m_type, m_max))); > > return; > > case VR_RANGE: > > gcc_checking_assert (m_type); > > @@ -732,7 +744,8 @@ frange::verify_range () > > // If all the properties are clear, we better not span the entire > > // domain, because that would make us varying. > > if (m_pos_nan && m_neg_nan) > > - gcc_checking_assert (!real_isinf (&m_min, 1) || !real_isinf (&m_max, 0)); > > + gcc_checking_assert (!vrp_val_is_min (build_real (m_type, m_min)) > > + || !vrp_val_is_max (build_real (m_type, m_max))); > > } > > > > // We can't do much with nonzeros yet. > > @@ -779,7 +792,7 @@ frange::zero_p () const > > void > > frange::set_nonnegative (tree type) > > { > > - set (type, dconst0, dconstinf); > > + set (type, dconst0, *TREE_REAL_CST_PTR (vrp_val_max (type))); > > > > // Set +NAN as the only possibility. > > if (HONOR_NANS (type)) > > @@ -3886,23 +3899,6 @@ range_tests_floats () > > r0.clear_nan (); > > ASSERT_FALSE (r0.varying_p ()); > > > > - // The endpoints of a VARYING are +-INF. > > - r0.set_varying (float_type_node); > > - ASSERT_TRUE (real_identical (&r0.lower_bound (), &dconstninf)); > > - ASSERT_TRUE (real_identical (&r0.upper_bound (), &dconstinf)); > > - > > - // The maximum representable range for a type is still a subset of VARYING. > > - REAL_VALUE_TYPE q, r; > > - real_min_representable (&q, float_type_node); > > - real_max_representable (&r, float_type_node); > > - r0 = frange (float_type_node, q, r); > > - // r0 is not a varying, because it does not include -INF/+INF. > > - ASSERT_FALSE (r0.varying_p ()); > > - // The upper bound of r0 must be less than +INF. > > - ASSERT_TRUE (real_less (&r0.upper_bound (), &dconstinf)); > > - // The lower bound of r0 must be greater than -INF. > > - ASSERT_TRUE (real_less (&dconstninf, &r0.lower_bound ())); > > - > > // For most architectures, where float and double are different > > // sizes, having the same endpoints does not necessarily mean the > > // ranges are equal. > > diff --git a/gcc/value-range.h b/gcc/value-range.h > > index 3668b331187..74879b76b40 100644 > > --- a/gcc/value-range.h > > +++ b/gcc/value-range.h > > @@ -593,6 +593,8 @@ extern void dump_value_range (FILE *, const vrange *); > > extern bool vrp_val_is_min (const_tree); > > extern bool vrp_val_is_max (const_tree); > > extern bool vrp_operand_equal_p (const_tree, const_tree); > > +inline void real_max_representable (REAL_VALUE_TYPE *r, const_tree type); > > +inline void real_min_representable (REAL_VALUE_TYPE *r, const_tree type); > > > > inline value_range_kind > > vrange::kind () const > > @@ -1009,7 +1011,15 @@ vrp_val_max (const_tree type) > > return wide_int_to_tree (const_cast (type), max); > > } > > if (frange::supports_p (type)) > > - return build_real (const_cast (type), dconstinf); > > + { > > + if (flag_finite_math_only) > > + { > > + REAL_VALUE_TYPE r; > > + real_max_representable (&r, type); > > + return build_real (const_cast (type), r); > > + } > > + return build_real (const_cast (type), dconstinf); > > Overall there's too many places affected IMHO. The above also shows > we're building trees a lot - note that REAL_CST are _not_ shared, so > each time you call build_real a new REAL_CST tree node is allocated > (and later GCed if no longer used). > > I thought vrp_val_min/max are legacy by now ... > > That said, using trees for the range representation might not be the > very best thing to do, it's unnecessarily wrapping things. > > > + } > > return NULL_TREE; > > } > > > > @@ -1023,7 +1033,15 @@ vrp_val_min (const_tree type) > > if (POINTER_TYPE_P (type)) > > return build_zero_cst (const_cast (type)); > > if (frange::supports_p (type)) > > - return build_real (const_cast (type), dconstninf); > > + { > > + if (flag_finite_math_only) > > + { > > + REAL_VALUE_TYPE r; > > + real_min_representable (&r, type); > > + return build_real (const_cast (type), r); > > + } > > + return build_real (const_cast (type), dconstninf); > > + } > > return NULL_TREE; > > } > > > > @@ -1073,8 +1091,8 @@ frange::set_varying (tree type) > > { > > m_kind = VR_VARYING; > > m_type = type; > > - m_min = dconstninf; > > - m_max = dconstinf; > > + m_min = *TREE_REAL_CST_PTR (vrp_val_min (type)); > > + m_max = *TREE_REAL_CST_PTR (vrp_val_max (type)); > > m_pos_nan = true; > > m_neg_nan = true; > > } > > @@ -1133,7 +1151,7 @@ frange::clear_nan () > > // Set R to maximum representable value for TYPE. > > > > inline void > > -real_max_representable (REAL_VALUE_TYPE *r, tree type) > > +real_max_representable (REAL_VALUE_TYPE *r, const_tree type) > > { > > char buf[128]; > > get_max_float (REAL_MODE_FORMAT (TYPE_MODE (type)), > > @@ -1145,7 +1163,7 @@ real_max_representable (REAL_VALUE_TYPE *r, tree type) > > // Set R to minimum representable value for TYPE. > > > > inline void > > -real_min_representable (REAL_VALUE_TYPE *r, tree type) > > +real_min_representable (REAL_VALUE_TYPE *r, const_tree type) > > { > > real_max_representable (r, type); > > *r = real_value_negate (r); > > -- > > 2.37.1 > > > --000000000000b85f4e05e95305da Content-Type: 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