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Diffstat (limited to 'sysdeps/ia64/fpu/libm_frexp.S')
| -rw-r--r-- | sysdeps/ia64/fpu/libm_frexp.S | 209 |
1 files changed, 0 insertions, 209 deletions
diff --git a/sysdeps/ia64/fpu/libm_frexp.S b/sysdeps/ia64/fpu/libm_frexp.S deleted file mode 100644 index c6bd676a40..0000000000 --- a/sysdeps/ia64/fpu/libm_frexp.S +++ /dev/null @@ -1,209 +0,0 @@ -.file "libm_frexp.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 -// 03/20/00 Improved speed -// 06/01/00 Fixed bug when x a double-extended denormal -// 12/08/00 Corrected label on .endp -// 01/23/02 Added handling for int 32 or 64 bits -// 05/20/02 Cleaned up namespace and sf0 syntax -// 02/10/03 Reordered header: .section, .global, .proc, .align -// -// API -//============================================================== -// double __libm_frexp(double x, int* y, int int_type) -// input floating point f8, pointer to y (r33), int int_type (r34) -// output floating point f8, returns the fraction of x, 0.5 <= fraction < 1.0 -// output int* y, returns the true exponent of x -// -// int_type = 0 if int is 32 bits -// int_type = 1 if int is 64 bits -// -// int* y is returned as a 32 bit integer if int_type = 0 -// int* y is returned as a 64 bit integer if int_type = 1 -// -// Overview of operation -//============================================================== -// break a floating point x number into fraction and an exponent -// The fraction is returned as a double -// The exponent is returned as an integer pointed to by y -// This is a true (not a biased exponent) but 0fffe is subtracted -// as a bias instead of 0xffff. This is because the fraction returned -// is between 0.5 and 1.0, not the expected IEEE range. -// -// The fraction is 0.5 <= fraction < 1.0 -// -// Registers used -//============================================================== -// -// general registers: -// r14 exponent bias for x negative -// r15 exponent bias for x positive -// r16 signexp of x -// r17 exponent mask -// r18 exponent of x -// r19 exponent result -// r20 signexp of 2^64 -// r32 on input contains the 64-bit IEEE double that is in f8 -// r33 on input pointer to 32-bit or 64-bit integer for exponent -// r34 on input contains 0 if output int is 32 bits, else output int is 64 bits -// -// predicate registers: -// p6 set if x is Nan, zero, or infinity -// p7 set if x negative -// p8 set if x positive -// p9 set if x double-extended denormal -// p10 set if int_type = 0, 32-bit integer -// p11 set if int_type = 1, 64-bit integer -// -// floating-point registers: -// f8 input, output -// f9 normalized x -// f10 signexp for significand result for x positive -// f11 signexp for significand result for x negative -// f12 2^64 - -.section .text -GLOBAL_LIBM_ENTRY(__libm_frexp) - -// Set signexp for significand result for x>0 -// If x is a NaN, zero, or infinity, return it. -// Put 0 in the int pointer. -// x NAN, ZERO, INFINITY? -// Set signexp for significand result for x<0 -{ .mfi - mov r15 = 0x0fffe - fclass.m p6,p7 = f8, 0xe7 - mov r14 = 0x2fffe -} -// Form signexp of 2^64 in case x double-extended denormal -// Save the normalized value of input in f9 -// The normalization also sets fault flags and takes faults if necessary -{ .mfi - mov r20 = 0x1003f - fnorm.s0 f9 = f8 - nop.i 999 ;; -} - -// Move signexp for significand result for x>0 to FP reg -// Form 2^64 in case x double-extended denormal -{ .mmi - setf.exp f10 = r15 - setf.exp f12 = r20 - nop.i 999 ;; -} - -// Move signexp for significand result for x<0 to FP reg -// p7 if x<0, else p8 -// If x=0,nan,inf, set p10 if output int to be 32 bits, or set p11 if 64 bits -{ .mfi - setf.exp f11 = r14 -(p7) fcmp.lt.s0 p7,p8 = f8,f0 -(p6) cmp.eq.unc p10,p11 = r34, r0 ;; -} - -// If x NAN, ZERO, INFINITY, set *y=0 and exit -{ .mmb -(p10) st4 [r33] = r0 // Store *y=0 as 32-bit integer -(p11) st8 [r33] = r0 // Store *y=0 as 64-bit integer -(p6) br.ret.spnt b0 ;; -} - -// Form exponent mask -// Test for fnorm(x) denormal, means x double-extended denormal -{ .mfi - mov r17 = 0x1ffff - fclass.m p9,p0 = f9, 0x0b - nop.i 999 ;; -} - -// If x double-extended denormal add 64 to exponent bias for scaling -// If x double-extended denormal multiply x * 2^64 which is normal -// Set p10 if output int to be 32 bits, or set p11 if 64 bits -{ .mfi -(p9) add r15 = 64, r15 -(p9) fmpy.s0 f9 = f9, f12 - cmp.eq p10,p11 = r34, r0 ;; -} - -// true exponent stored to int pointer -// the bias is treated as 0xfffe instead of -// normal 0xffff because we want the significand -// to be in the range <=0.5 sig < 1.0 -// Store the value of the exponent at the pointer in r33 - -// If x>0 form significand result -{ .mfi - nop.m 999 -(p8) fmerge.se f8 = f10,f9 - nop.i 999 ;; -} - -// Get signexp of normalized x -// If x<0 form significand result -{ .mfi - getf.exp r16 = f9 -(p7) fmerge.se f8 = f11,f9 - nop.i 999 ;; -} - -// Get exp of normalized x -// Subtract off bias to get true exponent of x -{ .mmi - and r18 = r17,r16 ;; - sub r19 = r18,r15 - nop.i 999 ;; -} - -// Store int *y as a 32-bit integer -// Make the value a double -{ .mfi -(p10) st4 [r33] = r19 // Store *y as 32-bit integer - fnorm.d.s0 f8 = f8 - nop.i 999 -} -{ .mfb -(p11) st8 [r33] = r19 // Store *y as 64-bit integer - nop.f 999 - br.ret.sptk b0 ;; -} - -GLOBAL_LIBM_END(__libm_frexp) |