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Diffstat (limited to 'sysdeps/ia64/fpu/s_logb.S')
| -rw-r--r-- | sysdeps/ia64/fpu/s_logb.S | 281 |
1 files changed, 0 insertions, 281 deletions
diff --git a/sysdeps/ia64/fpu/s_logb.S b/sysdeps/ia64/fpu/s_logb.S deleted file mode 100644 index 7ee8987..0000000 --- a/sysdeps/ia64/fpu/s_logb.S +++ /dev/null @@ -1,281 +0,0 @@ -.file "logb.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 -//============================================================== -// double logb( double x ); -// -// Overview of operation -//============================================================== -// The logb function extracts the exponent of x as an integer in -// floating-point format. -// logb computes log2 of x as a double -// -// logb is similar to ilogb but differs in the following ways: -// +-inf -// ilogb: returns INT_MAX -// logb: returns +inf -// Nan returns FP_LOGBNAN (which is either INT_MAX or INT_MIN) -// ilogb: returns INT_MAX (7fffffff) -// logb: returns QNAN (quietized SNAN) -// 0 returns FP_ILOGB0 (which is either INT_MIN or -INT_MAX) -// ilogb: returns -INT_MAX (80000001) -// logb: 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(logb) - -// 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.d.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 = 151 // 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(logb) - - -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 - stfd [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 - stfd [GR_Parameter_X] = f8 // STORE Parameter 1 on stack - add GR_Parameter_RESULT = 0,GR_Parameter_Y // Parameter 3 address - nop.b 0 -} -{ .mib - stfd [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 - ldfd 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# |