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-.file "logbf.s"
-
-
-// Copyright (c) 2000 - 2003, Intel Corporation
-// All rights reserved.
-//
-// Contributed 2000 by the Intel Numerics Group, Intel Corporation
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-// * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//
-// * Redistributions in binary form must reproduce the above copyright
-// notice, this list of conditions and the following disclaimer in the
-// documentation and/or other materials provided with the distribution.
-//
-// * The name of Intel Corporation may not be used to endorse or promote
-// products derived from this software without specific prior written
-// permission.
-
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL INTEL OR ITS
-// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
-// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY OR TORT (INCLUDING
-// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-//
-// Intel Corporation is the author of this code, and requests that all
-// problem reports or change requests be submitted to it directly at
-// http://www.intel.com/software/products/opensource/libraries/num.htm.
-//
-// History
-//==============================================================
-// 02/02/00 Initial version
-// 02/16/00 Modified to conform to C9X
-// 03/16/00 Improved speed
-// 04/04/00 Unwind support added
-// 05/30/00 Fixed bug when x double-extended denormal
-// 08/15/00 Bundle added after call to __libm_error_support to properly
-// set [the previously overwritten] GR_Parameter_RESULT.
-// 05/20/02 Cleaned up namespace and sf0 syntax
-// 01/20/03 Improved performance
-//
-// API
-//==============================================================
-// float logbf( float x );
-//
-// Overview of operation
-//==============================================================
-// The logbf function extracts the exponent of x as an integer in
-// floating-point format.
-// logbf computes log2 of x as a float
-//
-// logbf is similar to ilogbf but differs in the following ways:
-// +-inf
-// ilogbf: returns INT_MAX
-// logbf: returns +inf
-// Nan returns FP_LOGBNAN (which is either INT_MAX or INT_MIN)
-// ilogbf: returns INT_MAX (7fffffff)
-// logbf: returns QNAN (quietized SNAN)
-// 0 returns FP_ILOGB0 (which is either INT_MIN or -INT_MAX)
-// ilogbf: returns -INT_MAX (80000001)
-// logbf: returns -inf, raises the divide-by-zero exception,
-// and calls libm_error_support to set domain error
-//
-// Registers used
-//==============================================================
-// general registers used:
-// r26 -> r38
-// r35 -> r38 used as parameters to error path
-//
-// predicate registers used:
-// p6, p7, p8
-// floating-point registers used:
-// f9, f10, f11
-// f8, input
-
-rExpBias = r26
-rExpMask = r27
-rSignexp_x = r28
-rExp_x = r29
-rTrueExp_x = r30
-rExp_2to64 = r31
-
-GR_SAVE_PFS = r32
-GR_SAVE_B0 = r33
-GR_SAVE_GP = r34
-
-GR_Parameter_X = r35
-GR_Parameter_Y = r36
-GR_Parameter_RESULT = r37
-GR_Parameter_TAG = r38
-
-fExp_in_signif = f9
-fNorm_x = f10
-fFloat_Exp = f10
-f2to64 = f11
-
-.section .text
-GLOBAL_LIBM_ENTRY(logbf)
-
-// X NORMAL
-// TrueExp_x = exp(f8) - 0xffff
-// sig = TrueExp_x
-// f8 = convert_to_fp (sig))
-{ .mfi
- getf.exp rSignexp_x = f8
- fclass.m p8,p0 = f8, 0x0b // Test for x unorm
- mov rExpBias = 0xffff // Exponent bias
-}
-{ .mfi
- nop.m 0
- fnorm.s1 fNorm_x = f8
- mov rExpMask = 0x1ffff // Exponent mask
-}
-;;
-
-// Form signexp of 2^64 in case need to scale denormal
-{ .mfb
- mov rExp_2to64 = 0x1003f
- fclass.m p6,p0 = f8, 0x1e3 // Test x natval, nan, inf
-(p8) br.cond.spnt LOGB_DENORM // Branch if x unorm
-}
-;;
-
-LOGB_COMMON:
-// Return here from LOGB_DENORM
-{ .mfi
- and rExp_x = rSignexp_x, rExpMask // Get biased exponent
- fclass.m p7,p0 = f8, 0x07 // Test x zero
- nop.i 0
-}
-;;
-
-// X NAN or INFINITY, return f8 * f8
-{ .mfb
- sub rTrueExp_x = rExp_x, rExpBias // Get true exponent
-(p6) fma.s.s0 f8= f8,f8,f0 // Result if x natval, nan, inf
-(p6) br.ret.spnt b0 // Exit if x natval, nan, inf
-}
-;;
-
-{ .mib
- setf.sig fExp_in_signif = rTrueExp_x // Exponent as integer in fp
- nop.i 999
-(p7) br.cond.spnt LOGB_ZERO
-}
-;;
-
-// Result can be represented in less than 24 bits, so no precision completer
-// is needed.
-{ .mfb
- nop.m 0
- fcvt.xf f8 = fExp_in_signif
- br.ret.sptk b0 // Exit main path, 0 < |x| < inf
-}
-;;
-
-LOGB_DENORM:
-// Form 2^64 in case need to scale denormal
-// Check to see if double-extended denormal
-{ .mfi
- setf.exp f2to64 = rExp_2to64
- fclass.m p8,p0 = fNorm_x, 0x0b
- nop.i 0
-}
-;;
-
-{ .mfi
- nop.m 0
- fcmp.eq.s0 p7,p0 = f8, f0 // Dummy op to set denormal flag
- nop.i 0
-}
-;;
-
-// If double-extended denormal add 64 to exponent bias for scaling
-// If double-extended denormal form x * 2^64 which is normal
-{ .mfi
-(p8) add rExpBias = 64, rExpBias
-(p8) fmpy.s1 fNorm_x = fNorm_x, f2to64
- nop.i 0
-}
-;;
-
-// Logic is the same as normal path but use normalized input
-{ .mib
- getf.exp rSignexp_x = fNorm_x
- nop.i 0
- br.cond.sptk LOGB_COMMON // Return to main path
-}
-;;
-
-LOGB_ZERO:
-// Here if x zero
-// f10 = -|f8|
-// f9 = 1.0/f10 = -1.0/|f8| = -inf
-
-{ .mmf
- alloc r32=ar.pfs,1,2,4,0
- mov GR_Parameter_TAG = 152 // Error code
- fmerge.ns f10 = f0,f8
-}
-;;
-
-{ .mfb
- nop.m 0
- frcpa.s0 f9,p6 = f1,f10 // Produce -inf, Z flag
- br.cond.sptk __libm_error_region // Call error support
-}
-;;
-
-GLOBAL_LIBM_END(logbf)
-
-
-LOCAL_LIBM_ENTRY(__libm_error_region)
-.prologue
-
-{ .mfi
- add GR_Parameter_Y=-32,sp // Parameter 2 value
- nop.f 0
-.save ar.pfs,GR_SAVE_PFS
- mov GR_SAVE_PFS=ar.pfs // Save ar.pfs
-}
-{ .mfi
-.fframe 64
- add sp=-64,sp // Create new stack
- nop.f 0
- mov GR_SAVE_GP=gp // Save gp
-};;
-
-{ .mmi
- stfs [GR_Parameter_Y] = f0,16 // STORE Parameter 2 on stack
- add GR_Parameter_X = 16,sp // Parameter 1 address
-.save b0, GR_SAVE_B0
- mov GR_SAVE_B0=b0 // Save b0
-};;
-
-.body
-{ .mib
- stfs [GR_Parameter_X] = f8 // STORE Parameter 1 on stack
- add GR_Parameter_RESULT = 0,GR_Parameter_Y // Parameter 3 address
- nop.b 0
-}
-{ .mib
- stfs [GR_Parameter_Y] = f9 // Store Parameter 3 on stack
- add GR_Parameter_Y = -16,GR_Parameter_Y
- br.call.sptk b0=__libm_error_support# // Call error handling function
-};;
-
-{ .mmi
- add GR_Parameter_RESULT = 48,sp
- nop.m 0
- nop.i 0
-};;
-
-{ .mmi
- ldfs f8 = [GR_Parameter_RESULT] // Get return result off stack
-.restore sp
- add sp = 64,sp // Restore stack pointer
- mov b0 = GR_SAVE_B0 // Restore return address
-};;
-
-{ .mib
- mov gp = GR_SAVE_GP // Restore gp
- mov ar.pfs = GR_SAVE_PFS // Restore ar.pfs
- br.ret.sptk b0
-};;
-
-LOCAL_LIBM_END(__libm_error_region)
-
-
-.type __libm_error_support#,@function
-.global __libm_error_support#