From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38522) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VyqeL-0006zT-Jx for qemu-devel@nongnu.org; Thu, 02 Jan 2014 17:22:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Vyqe9-0004al-SD for qemu-devel@nongnu.org; Thu, 02 Jan 2014 17:21:57 -0500 From: Tom Musta Date: Thu, 2 Jan 2014 16:21:15 -0600 Message-Id: <1388701295-29855-3-git-send-email-tommusta@gmail.com> In-Reply-To: <1388701295-29855-1-git-send-email-tommusta@gmail.com> References: <1388701295-29855-1-git-send-email-tommusta@gmail.com> Subject: [Qemu-devel] [V5 PATCH 02/22] softfloat: Add float32_to_uint64() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Tom Musta , qemu-ppc@nongnu.org This patch adds the float32_to_uint64() routine, which converts a 32-bit floating point number to an unsigned 64 bit number. This contribution can be licensed under either the softfloat-2a or -2b license. Signed-off-by: Tom Musta --- V2: Reduced patch to just this single routine per feedback from Peter Maydell. V4: Now passing sign to roundAndPackUint64() V5: Proper handling of small negatives and negative NaNs. fpu/softfloat.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ include/fpu/softfloat.h | 1 + 2 files changed, 47 insertions(+), 0 deletions(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 05e2877..9f42a5b 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -1558,6 +1558,52 @@ int64 float32_to_int64( float32 a STATUS_PARAM ) /*---------------------------------------------------------------------------- | Returns the result of converting the single-precision floating-point value +| `a' to the 64-bit unsigned 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 +| according to the current rounding mode. If `a' is a NaN, the largest +| unsigned integer is returned. Otherwise, if the conversion overflows, the +| largest unsigned integer is returned. If the 'a' is negative, the result +| is rounded and zero is returned; values that do not round to zero will +| raise the inexact exception flag. +*----------------------------------------------------------------------------*/ + +uint64 float32_to_uint64(float32 a STATUS_PARAM) +{ + flag aSign; + int_fast16_t aExp, shiftCount; + uint32_t aSig; + uint64_t aSig64, aSigExtra; + a = float32_squash_input_denormal(a STATUS_VAR); + + aSig = extractFloat32Frac(a); + aExp = extractFloat32Exp(a); + aSign = extractFloat32Sign(a); + if ((aSign) && (aExp > 126)) { + float_raise(float_flag_invalid STATUS_VAR); + if (float32_is_any_nan(a)) { + return (int64_t)LIT64(0xFFFFFFFFFFFFFFFF); + } else { + return 0; + } + } + shiftCount = 0xBE - aExp; + if (aExp) { + aSig |= 0x00800000; + } + if (shiftCount < 0) { + float_raise(float_flag_invalid STATUS_VAR); + return (int64_t)LIT64(0xFFFFFFFFFFFFFFFF); + } + + aSig64 = aSig; + aSig64 <<= 40; + shift64ExtraRightJamming(aSig64, 0, shiftCount, &aSig64, &aSigExtra); + return roundAndPackUint64(aSign, aSig64, aSigExtra STATUS_VAR); +} + +/*---------------------------------------------------------------------------- +| 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, except that the conversion is always rounded toward zero. If diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h index 2365274..080b36d 100644 --- a/include/fpu/softfloat.h +++ b/include/fpu/softfloat.h @@ -272,6 +272,7 @@ int32 float32_to_int32_round_to_zero( float32 STATUS_PARAM ); uint32 float32_to_uint32( float32 STATUS_PARAM ); uint32 float32_to_uint32_round_to_zero( float32 STATUS_PARAM ); int64 float32_to_int64( float32 STATUS_PARAM ); +uint64 float32_to_uint64(float32 STATUS_PARAM); int64 float32_to_int64_round_to_zero( float32 STATUS_PARAM ); float64 float32_to_float64( float32 STATUS_PARAM ); floatx80 float32_to_floatx80( float32 STATUS_PARAM ); -- 1.7.1