| .file "significandf.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 |
| // 02/03/00 Modified to improve speed |
| // 05/31/00 Fixed bug when x a double-extended denormal |
| // 05/20/02 Cleaned up namespace and sf0 syntax |
| // 02/10/03 Reordered header: .section, .global, .proc, .align |
| // |
| // API |
| //============================================================== |
| // float significandf(float x) |
| // Overview of operation |
| //============================================================== |
| // If x = sig * 2**n with 1 <= sig < 2 |
| // significandf returns sig |
| // |
| // predicate registers used: |
| // p6, p7 |
| // |
| // floating-point registers used: |
| // f8, f9, f10 |
| |
| .section .text |
| GLOBAL_LIBM_ENTRY(significandf) |
| |
| // qnan snan inf norm unorm 0 -+ |
| // 1 1 1 0 0 1 11 |
| |
| // f10 gets f8(sign) with f1(exp,significand) |
| { .mfi |
| nop.m 999 |
| fmerge.s f10 = f8,f1 |
| nop.i 999 |
| } |
| { .mfi |
| nop.m 999 |
| fnorm.s0 f9 = f8 |
| nop.i 999 ;; |
| } |
| |
| // Test for denormal input |
| { .mfi |
| nop.m 999 |
| fclass.m.unc p7,p0 = f8, 0x0b |
| nop.i 999 ;; |
| } |
| |
| // p6 = TRUE ==> x is not (nan,inf,0) |
| // return sign(f8) exp(f1) significand(f8) |
| // else x is (nan,inf,0) |
| // return sign(f8) exp(f8) significand(f8), normalized. |
| { .mfi |
| nop.m 999 |
| fclass.m.unc p0,p6 = f8, 0xe7 |
| nop.i 999 ;; |
| } |
| |
| { .mmb |
| nop.m 999 |
| nop.m 999 |
| (p7) br.cond.spnt SIGNIFICAND_DENORM ;; // Branch if x denormal |
| } |
| |
| { .mfi |
| nop.m 999 |
| (p6) fmerge.se f8 = f10,f8 |
| nop.i 999 ;; |
| } |
| |
| { .mfb |
| nop.m 999 |
| fnorm.s.s0 f8 = f8 |
| br.ret.sptk b0 ;; |
| } |
| |
| SIGNIFICAND_DENORM: |
| // Here if x denorm |
| { .mfi |
| nop.m 999 |
| fmerge.se f8 = f10,f9 |
| nop.i 999 ;; |
| } |
| |
| // Check if fnorm(x) still denormal, means x double-extended denormal |
| { .mfi |
| nop.m 999 |
| fclass.m.unc p7,p0 = f9, 0x0b |
| nop.i 999 ;; |
| } |
| |
| // This will be the final result unless x double-extended denormal |
| { .mfi |
| nop.m 999 |
| fnorm.s.s0 f8 = f8 |
| nop.i 999 ;; |
| } |
| |
| // If x double-extended denorm, then significand ok, but must merge in |
| // correct signexp |
| { .mfi |
| nop.m 999 |
| (p7) fmerge.se f8 = f10,f8 |
| nop.i 999 ;; |
| } |
| |
| // Final normalization if x double-extended denorm |
| { .mfb |
| nop.m 999 |
| (p7) fnorm.s.s0 f8 = f8 |
| br.ret.sptk b0 ;; |
| } |
| |
| GLOBAL_LIBM_END(significandf) |
