From patchwork Wed Feb 21 11:05:18 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alex_Benn=C3=A9e?= X-Patchwork-Id: 129038 Delivered-To: patch@linaro.org Received: by 10.46.124.24 with SMTP id x24csp510974ljc; Wed, 21 Feb 2018 03:29:12 -0800 (PST) X-Google-Smtp-Source: AH8x225cHj/6uXMXMv59+wlBL4OZXFr4XbkcRWy/viBc6a8niKyyVWUnJXQQ7wt70SCeEzekdbiB X-Received: by 2002:a25:b685:: with SMTP id s5-v6mr1964351ybj.10.1519212552329; Wed, 21 Feb 2018 03:29:12 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1519212552; cv=none; d=google.com; s=arc-20160816; b=UJBsTKMfgFjhoMtx+k/RFTdeseVBy5HJKG7tove6rPaLb0YWoVPWTO+yhTIkBadQWQ /KlJHJCksmRHEpy6RbWJxvDXRKIt13o7QM+JQ6Y+r0WRnn5MJvFxcgsihC/2VOek9JBa fQOi2yD/B4cO9Jw6NIZ3ExNBSAws8nidmVP6f8Mh86/fgHVP7hTai4YaBa0TRE6QZ5I7 w9JgN9LzvahT9nedLEemLIKSEpSyXDehDlDh0No2eFu7oLQnkeaySmvFpdIVm7dfNq4n trVwICFgNlMbBhOiLL0gwhE0ORFJU7/iOBybmRQZhfEzt9vxWzOCjFyK67ru3sITXe+q WjAg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:cc:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:subject :content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:to:from:dkim-signature:arc-authentication-results; bh=ofw+612EJnycmLoqeGzrS8VE5fPUOvxMqCWpPPVENsQ=; b=s+xEuV9ZwN0x5QdEp+wpzI8CFjk8Sf51YXoBU7u0QgtKwgbz0uu/1nQ9F8fiwaEZ71 129cT95935T1Jp5D9YHf7qJaXuG6L7GPq47gESzd7Xut3by42/bEg5NbdIjFpShWpG8v M7hbYzn07sSJ2+xvIvSh6NF2JAZ+AzTiiRt9xbcuPjZAjF9I94fMy6JYYV+oVNm4Ro+N 6SVM5/ANzfykPzmd8H12yL8EYZG8lTkad5RjHHASQZBW7Hyoff+FQLXwFiX5ds8m6q1N Il7NrtVvD/agXN8datMuZcJ+8aGg6GA/1WC9K7Suo8MzznJOTddlL4YSzmwh64IYPWp4 KwVw== ARC-Authentication-Results: i=1; mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=gYQTJPRp; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom=qemu-devel-bounces+patch=linaro.org@nongnu.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. [2001:4830:134:3::11]) by mx.google.com with ESMTPS id d190si4681105ywe.175.2018.02.21.03.29.12 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 21 Feb 2018 03:29:12 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=gYQTJPRp; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom=qemu-devel-bounces+patch=linaro.org@nongnu.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:60183 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eoSaF-0006I5-Mt for patch@linaro.org; Wed, 21 Feb 2018 06:29:11 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37339) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eoSK7-00017p-AW for qemu-devel@nongnu.org; Wed, 21 Feb 2018 06:12:33 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eoSK4-0002MM-Qz for qemu-devel@nongnu.org; Wed, 21 Feb 2018 06:12:31 -0500 Received: from mail-wr0-x242.google.com ([2a00:1450:400c:c0c::242]:38265) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eoSK4-0002Lj-Fd for qemu-devel@nongnu.org; Wed, 21 Feb 2018 06:12:28 -0500 Received: by mail-wr0-x242.google.com with SMTP id n7so3344979wrn.5 for ; Wed, 21 Feb 2018 03:12:28 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=ofw+612EJnycmLoqeGzrS8VE5fPUOvxMqCWpPPVENsQ=; b=gYQTJPRpu6jxhWDMAigO5MWa4Vh3miWWgBR7UDypqc2GMGcYZEGoyWXtiGoG80/wtn jRhl3lnDaDz/LzoSyIkTqfdsBMvyQgKnn49yPm7uth9Q7R6pQbYmhpCJnEYF5j7XMRWD zETwO9dB2U8Xu5ggrsP2Q+iyCenWYS6UQWRl4= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=ofw+612EJnycmLoqeGzrS8VE5fPUOvxMqCWpPPVENsQ=; b=NR3g8e3M5icmXlQCCrpnyk7HP3199dM+UKQ90t8eZ+vRcdhbPwcqrkCewRv1rOThwZ oCGCTl2i7G2GFN2H/5lmVLI6zFmwpeuFSEC2GWlO10wdeorFasTHtKdgGq/5p1az3ofV qbDNTtpHhqhQqrHfdMcIL8aIXR97owfK2168xmRT6cnxdjyALbhTiBBtZ5iFFC6Kuqyy ZyGvst4FZlCBhuqVbvljA9PhZYE4iM320FaYabtK7X051K3bP0Z3YU+7pvxROCopGate xDfMwv8XMVdXaDsh6QQVWYO8E1pldK2YcBO419gX+IvFFi9Ps+/dH7VgsmD4NacfmNHJ aO/w== X-Gm-Message-State: APf1xPDx1GTHnqAKliy4nN6Es4f+7gLr2t+SgHeEyzpJHeVeAUmWs7j1 cSc9MlrblrpRF/xanky6nBu1sHxuz/E= X-Received: by 10.28.43.66 with SMTP id r63mr1713877wmr.30.1519211547307; Wed, 21 Feb 2018 03:12:27 -0800 (PST) Received: from zen.linaro.local ([81.128.185.34]) by smtp.gmail.com with ESMTPSA id m55sm5238275wrf.38.2018.02.21.03.12.21 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 21 Feb 2018 03:12:24 -0800 (PST) Received: from zen.linaroharston (localhost [127.0.0.1]) by zen.linaro.local (Postfix) with ESMTP id 9B9A23E0CC8; Wed, 21 Feb 2018 11:05:24 +0000 (GMT) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: peter.maydell@linaro.org Date: Wed, 21 Feb 2018 11:05:18 +0000 Message-Id: <20180221110523.859-19-alex.bennee@linaro.org> X-Mailer: git-send-email 2.15.1 In-Reply-To: <20180221110523.859-1-alex.bennee@linaro.org> References: <20180221110523.859-1-alex.bennee@linaro.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:400c:c0c::242 Subject: [Qemu-devel] [PULL 18/22] fpu/softfloat: re-factor int/uint to float X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?q?Alex_Benn=C3=A9e?= , qemu-devel@nongnu.org, Aurelien Jarno Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" These are considerably simpler as the lower order integers can just use the higher order conversion function. As the decomposed fractional part is a full 64 bit rounding and inexact handling comes from the pack functions. Signed-off-by: Alex Bennée Reviewed-by: Richard Henderson -- 2.15.1 diff --git a/fpu/softfloat.c b/fpu/softfloat.c index da0c43c0e7..4313d3a602 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -1500,6 +1500,169 @@ FLOAT_TO_UINT(64, 64) #undef FLOAT_TO_UINT +/* + * Integer to float conversions + * + * Returns the result of converting the two's complement integer `a' + * to the floating-point format. The conversion is performed according + * to the IEC/IEEE Standard for Binary Floating-Point Arithmetic. + */ + +static FloatParts int_to_float(int64_t a, float_status *status) +{ + FloatParts r; + if (a == 0) { + r.cls = float_class_zero; + r.sign = false; + } else if (a == (1ULL << 63)) { + r.cls = float_class_normal; + r.sign = true; + r.frac = DECOMPOSED_IMPLICIT_BIT; + r.exp = 63; + } else { + uint64_t f; + if (a < 0) { + f = -a; + r.sign = true; + } else { + f = a; + r.sign = false; + } + int shift = clz64(f) - 1; + r.cls = float_class_normal; + r.exp = (DECOMPOSED_BINARY_POINT - shift); + r.frac = f << shift; + } + + return r; +} + +float16 int64_to_float16(int64_t a, float_status *status) +{ + FloatParts pa = int_to_float(a, status); + return float16_round_pack_canonical(pa, status); +} + +float16 int32_to_float16(int32_t a, float_status *status) +{ + return int64_to_float16(a, status); +} + +float16 int16_to_float16(int16_t a, float_status *status) +{ + return int64_to_float16(a, status); +} + +float32 int64_to_float32(int64_t a, float_status *status) +{ + FloatParts pa = int_to_float(a, status); + return float32_round_pack_canonical(pa, status); +} + +float32 int32_to_float32(int32_t a, float_status *status) +{ + return int64_to_float32(a, status); +} + +float32 int16_to_float32(int16_t a, float_status *status) +{ + return int64_to_float32(a, status); +} + +float64 int64_to_float64(int64_t a, float_status *status) +{ + FloatParts pa = int_to_float(a, status); + return float64_round_pack_canonical(pa, status); +} + +float64 int32_to_float64(int32_t a, float_status *status) +{ + return int64_to_float64(a, status); +} + +float64 int16_to_float64(int16_t a, float_status *status) +{ + return int64_to_float64(a, status); +} + + +/* + * Unsigned Integer to float conversions + * + * Returns the result of converting the unsigned integer `a' to the + * floating-point format. The conversion is performed according to the + * IEC/IEEE Standard for Binary Floating-Point Arithmetic. + */ + +static FloatParts uint_to_float(uint64_t a, float_status *status) +{ + FloatParts r = { .sign = false}; + + if (a == 0) { + r.cls = float_class_zero; + } else { + int spare_bits = clz64(a) - 1; + r.cls = float_class_normal; + r.exp = DECOMPOSED_BINARY_POINT - spare_bits; + if (spare_bits < 0) { + shift64RightJamming(a, -spare_bits, &a); + r.frac = a; + } else { + r.frac = a << spare_bits; + } + } + + return r; +} + +float16 uint64_to_float16(uint64_t a, float_status *status) +{ + FloatParts pa = uint_to_float(a, status); + return float16_round_pack_canonical(pa, status); +} + +float16 uint32_to_float16(uint32_t a, float_status *status) +{ + return uint64_to_float16(a, status); +} + +float16 uint16_to_float16(uint16_t a, float_status *status) +{ + return uint64_to_float16(a, status); +} + +float32 uint64_to_float32(uint64_t a, float_status *status) +{ + FloatParts pa = uint_to_float(a, status); + return float32_round_pack_canonical(pa, status); +} + +float32 uint32_to_float32(uint32_t a, float_status *status) +{ + return uint64_to_float32(a, status); +} + +float32 uint16_to_float32(uint16_t a, float_status *status) +{ + return uint64_to_float32(a, status); +} + +float64 uint64_to_float64(uint64_t a, float_status *status) +{ + FloatParts pa = uint_to_float(a, status); + return float64_round_pack_canonical(pa, status); +} + +float64 uint32_to_float64(uint32_t a, float_status *status) +{ + return uint64_to_float64(a, status); +} + +float64 uint16_to_float64(uint16_t a, float_status *status) +{ + return uint64_to_float64(a, status); +} + /*---------------------------------------------------------------------------- | Takes a 64-bit fixed-point value `absZ' with binary point between bits 6 | and 7, and returns the properly rounded 32-bit integer corresponding to the @@ -2591,43 +2754,6 @@ static float128 normalizeRoundAndPackFloat128(flag zSign, int32_t zExp, } -/*---------------------------------------------------------------------------- -| Returns the result of converting the 32-bit two's complement integer `a' -| to the single-precision floating-point format. The conversion is performed -| according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic. -*----------------------------------------------------------------------------*/ - -float32 int32_to_float32(int32_t a, float_status *status) -{ - flag zSign; - - if ( a == 0 ) return float32_zero; - if ( a == (int32_t) 0x80000000 ) return packFloat32( 1, 0x9E, 0 ); - zSign = ( a < 0 ); - return normalizeRoundAndPackFloat32(zSign, 0x9C, zSign ? -a : a, status); -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the 32-bit two's complement integer `a' -| to the double-precision floating-point format. The conversion is performed -| according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic. -*----------------------------------------------------------------------------*/ - -float64 int32_to_float64(int32_t a, float_status *status) -{ - flag zSign; - uint32_t absA; - int8_t shiftCount; - uint64_t zSig; - - if ( a == 0 ) return float64_zero; - zSign = ( a < 0 ); - absA = zSign ? - a : a; - shiftCount = countLeadingZeros32( absA ) + 21; - zSig = absA; - return packFloat64( zSign, 0x432 - shiftCount, zSig<= 0) { - return packFloat32(0, 0x95 - shiftcount, a << shiftcount); - } - /* Otherwise we need to do a round-and-pack. roundAndPackFloat32() - * expects the binary point between bits 30 and 29, hence the + 7. - */ - shiftcount += 7; - if (shiftcount < 0) { - shift64RightJamming(a, -shiftcount, &a); - } else { - a <<= shiftcount; - } - - return roundAndPackFloat32(0, 0x9c - shiftcount, a, status); -} - -/*---------------------------------------------------------------------------- -| Returns the result of converting the 64-bit unsigned integer `a' -| to the double-precision floating-point format. The conversion is performed -| according to the IEC/IEEE Standard for Binary Floating-Point Arithmetic. -*----------------------------------------------------------------------------*/ - -float64 uint64_to_float64(uint64_t a, float_status *status) -{ - int exp = 0x43C; - int shiftcount; - - if (a == 0) { - return float64_zero; - } - - shiftcount = countLeadingZeros64(a) - 1; - if (shiftcount < 0) { - shift64RightJamming(a, -shiftcount, &a); - } else { - a <<= shiftcount; - } - return roundAndPackFloat64(0, exp - shiftcount, a, status); -} - /*---------------------------------------------------------------------------- | Returns the result of converting the 64-bit unsigned integer `a' | to the quadruple-precision floating-point format. The conversion is performed @@ -6714,19 +6731,6 @@ int float128_unordered_quiet(float128 a, float128 b, float_status *status) return 0; } -/* misc functions */ -float32 uint32_to_float32(uint32_t a, float_status *status) -{ - return int64_to_float32(a, status); -} - -float64 uint32_to_float64(uint32_t a, float_status *status) -{ - return int64_to_float64(a, status); -} - - - #define COMPARE(s, nan_exp) \ static inline int float ## s ## _compare_internal(float ## s a, float ## s b,\ int is_quiet, float_status *status) \ diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index ec1e701c26..3e6fdd756a 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -190,9 +190,13 @@ enum { /*---------------------------------------------------------------------------- | Software IEC/IEEE integer-to-floating-point conversion routines. *----------------------------------------------------------------------------*/ +float32 int16_to_float32(int16_t, float_status *status); float32 int32_to_float32(int32_t, float_status *status); +float64 int16_to_float64(int16_t, float_status *status); float64 int32_to_float64(int32_t, float_status *status); +float32 uint16_to_float32(uint16_t, float_status *status); float32 uint32_to_float32(uint32_t, float_status *status); +float64 uint16_to_float64(uint16_t, float_status *status); float64 uint32_to_float64(uint32_t, float_status *status); floatx80 int32_to_floatx80(int32_t, float_status *status); float128 int32_to_float128(int32_t, float_status *status); @@ -204,27 +208,6 @@ float32 uint64_to_float32(uint64_t, float_status *status); float64 uint64_to_float64(uint64_t, float_status *status); float128 uint64_to_float128(uint64_t, float_status *status); -/* We provide the int16 versions for symmetry of API with float-to-int */ -static inline float32 int16_to_float32(int16_t v, float_status *status) -{ - return int32_to_float32(v, status); -} - -static inline float32 uint16_to_float32(uint16_t v, float_status *status) -{ - return uint32_to_float32(v, status); -} - -static inline float64 int16_to_float64(int16_t v, float_status *status) -{ - return int32_to_float64(v, status); -} - -static inline float64 uint16_to_float64(uint16_t v, float_status *status) -{ - return uint32_to_float64(v, status); -} - /*---------------------------------------------------------------------------- | Software half-precision conversion routines. *----------------------------------------------------------------------------*/ @@ -245,6 +228,11 @@ uint64_t float16_to_uint64(float16 a, float_status *status); int64_t float16_to_int64_round_to_zero(float16, float_status *status); uint64_t float16_to_uint64_round_to_zero(float16 a, float_status *status); float16 int16_to_float16(int16_t a, float_status *status); +float16 int32_to_float16(int32_t a, float_status *status); +float16 int64_to_float16(int64_t a, float_status *status); +float16 uint16_to_float16(uint16_t a, float_status *status); +float16 uint32_to_float16(uint32_t a, float_status *status); +float16 uint64_to_float16(uint64_t a, float_status *status); /*---------------------------------------------------------------------------- | Software half-precision operations.