From patchwork Thu Nov 11 18:24:01 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Maydell X-Patchwork-Id: 70855 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [199.232.76.165]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTPS id B843FB7136 for ; Fri, 12 Nov 2010 05:31:54 +1100 (EST) Received: from localhost ([127.0.0.1]:50545 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PGbq7-0005Xa-IO for incoming@patchwork.ozlabs.org; Thu, 11 Nov 2010 13:25:39 -0500 Received: from [140.186.70.92] (port=37362 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1PGboe-0005SV-IS for qemu-devel@nongnu.org; Thu, 11 Nov 2010 13:24:10 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1PGbob-0000fd-C2 for qemu-devel@nongnu.org; Thu, 11 Nov 2010 13:24:08 -0500 Received: from mnementh.archaic.org.uk ([81.2.115.146]:46371) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1PGboa-0000e9-Fe for qemu-devel@nongnu.org; Thu, 11 Nov 2010 13:24:05 -0500 Received: from pm215 by mnementh.archaic.org.uk with local (Exim 4.69) (envelope-from ) id 1PGboY-0007VS-Vy for qemu-devel@nongnu.org; Thu, 11 Nov 2010 18:24:02 +0000 From: Peter Maydell To: qemu-devel@nongnu.org Date: Thu, 11 Nov 2010 18:24:01 +0000 Message-Id: <1289499842-28818-8-git-send-email-peter.maydell@linaro.org> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1289499842-28818-1-git-send-email-peter.maydell@linaro.org> References: <1289499842-28818-1-git-send-email-peter.maydell@linaro.org> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 2) Subject: [Qemu-devel] [PATCH 7/8] softfloat: Add float/double to 16 bit integer conversion functions X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The ARM architecture needs float/double to 16 bit integer conversions. (The 32 bit versions aren't sufficient because of the requirement to saturate at 16 bit MAXINT/MININT and to get the exception bits right.) Signed-off-by: Peter Maydell --- fpu/softfloat.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ fpu/softfloat.h | 4 ++ 2 files changed, 140 insertions(+), 0 deletions(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 0b82797..6f5b05d 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -1355,6 +1355,55 @@ int32 float32_to_int32_round_to_zero( float32 a STATUS_PARAM ) /*---------------------------------------------------------------------------- | Returns the result of converting the single-precision floating-point value +| `a' to the 16-bit two's complement integer format. The conversion is +| performed according to the IEC/IEEE Standard for Binary Floating-Point +| Arithmetic, except that the conversion is always rounded toward zero. +| If `a' is a NaN, the largest positive integer is returned. Otherwise, if +| the conversion overflows, the largest integer with the same sign as `a' is +| returned. +*----------------------------------------------------------------------------*/ + +int16 float32_to_int16_round_to_zero( float32 a STATUS_PARAM ) +{ + flag aSign; + int16 aExp, shiftCount; + bits32 aSig; + int32 z; + + aSig = extractFloat32Frac( a ); + aExp = extractFloat32Exp( a ); + aSign = extractFloat32Sign( a ); + shiftCount = aExp - 0x8E; + if ( 0 <= shiftCount ) { + if ( float32_val(a) != 0xC7000000 ) { + float_raise( float_flag_invalid STATUS_VAR); + if ( ! aSign || ( ( aExp == 0xFF ) && aSig ) ) { + return 0x7FFF; + } + } + return (sbits32) 0xffff8000; + } + else if ( aExp <= 0x7E ) { + if ( aExp | aSig ) { + STATUS(float_exception_flags) |= float_flag_inexact; + } + return 0; + } + shiftCount -= 0x10; + aSig = ( aSig | 0x00800000 )<<8; + z = aSig>>( - shiftCount ); + if ( (bits32) ( aSig<<( shiftCount & 31 ) ) ) { + STATUS(float_exception_flags) |= float_flag_inexact; + } + if ( aSign ) { + z = - z; + } + return z; + +} + +/*---------------------------------------------------------------------------- +| Returns the result of converting the single-precision floating-point value | `a' to the 64-bit two's complement integer format. The conversion is | performed according to the IEC/IEEE Standard for Binary Floating-Point | Arithmetic---which means in particular that the conversion is rounded @@ -2412,6 +2461,57 @@ int32 float64_to_int32_round_to_zero( float64 a STATUS_PARAM ) /*---------------------------------------------------------------------------- | Returns the result of converting the double-precision floating-point value +| `a' to the 16-bit two's complement integer format. The conversion is +| performed according to the IEC/IEEE Standard for Binary Floating-Point +| Arithmetic, except that the conversion is always rounded toward zero. +| If `a' is a NaN, the largest positive integer is returned. Otherwise, if +| the conversion overflows, the largest integer with the same sign as `a' is +| returned. +*----------------------------------------------------------------------------*/ + +int16 float64_to_int16_round_to_zero( float64 a STATUS_PARAM ) +{ + flag aSign; + int16 aExp, shiftCount; + bits64 aSig, savedASig; + int32 z; + + aSig = extractFloat64Frac( a ); + aExp = extractFloat64Exp( a ); + aSign = extractFloat64Sign( a ); + if ( 0x40E < aExp ) { + if ( ( aExp == 0x7FF ) && aSig ) { + aSign = 0; + } + goto invalid; + } + else if ( aExp < 0x3FF ) { + if ( aExp || aSig ) { + STATUS(float_exception_flags) |= float_flag_inexact; + } + return 0; + } + aSig |= LIT64( 0x0010000000000000 ); + shiftCount = 0x433 - aExp; + savedASig = aSig; + aSig >>= shiftCount; + z = aSig; + if ( aSign ) { + z = - z; + } + if ( ( (int16_t)z < 0 ) ^ aSign ) { + invalid: + float_raise( float_flag_invalid STATUS_VAR); + return aSign ? (sbits32) 0xffff8000 : 0x7FFF; + } + if ( ( aSig< 0xffff) { + res = 0xffff; + float_raise( float_flag_invalid STATUS_VAR); + } else { + res = v; + } + return res; +} + unsigned int float64_to_uint32( float64 a STATUS_PARAM ) { int64_t v; @@ -5668,6 +5786,24 @@ unsigned int float64_to_uint32_round_to_zero( float64 a STATUS_PARAM ) return res; } +unsigned int float64_to_uint16_round_to_zero( float64 a STATUS_PARAM ) +{ + int64_t v; + unsigned int res; + + v = float64_to_int64_round_to_zero(a STATUS_VAR); + if (v < 0) { + res = 0; + float_raise( float_flag_invalid STATUS_VAR); + } else if (v > 0xffff) { + res = 0xffff; + float_raise( float_flag_invalid STATUS_VAR); + } else { + res = v; + } + return res; +} + /* FIXME: This looks broken. */ uint64_t float64_to_uint64 (float64 a STATUS_PARAM) { diff --git a/fpu/softfloat.h b/fpu/softfloat.h index 9528825..5d68a07 100644 --- a/fpu/softfloat.h +++ b/fpu/softfloat.h @@ -251,6 +251,8 @@ float32 float16_to_float32( bits16, flag STATUS_PARAM ); /*---------------------------------------------------------------------------- | Software IEC/IEEE single-precision conversion routines. *----------------------------------------------------------------------------*/ +int float32_to_int16_round_to_zero( float32 STATUS_PARAM ); +unsigned int float32_to_uint16_round_to_zero( float32 STATUS_PARAM ); int float32_to_int32( float32 STATUS_PARAM ); int float32_to_int32_round_to_zero( float32 STATUS_PARAM ); unsigned int float32_to_uint32( float32 STATUS_PARAM ); @@ -321,6 +323,8 @@ INLINE int float32_is_zero(float32 a) /*---------------------------------------------------------------------------- | Software IEC/IEEE double-precision conversion routines. *----------------------------------------------------------------------------*/ +int float64_to_int16_round_to_zero( float64 STATUS_PARAM ); +unsigned int float64_to_uint16_round_to_zero( float64 STATUS_PARAM ); int float64_to_int32( float64 STATUS_PARAM ); int float64_to_int32_round_to_zero( float64 STATUS_PARAM ); unsigned int float64_to_uint32( float64 STATUS_PARAM );