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Diffstat (limited to 'sysdeps/ia64/fpu/s_nexttoward.S')
| -rw-r--r-- | sysdeps/ia64/fpu/s_nexttoward.S | 488 |
1 files changed, 0 insertions, 488 deletions
diff --git a/sysdeps/ia64/fpu/s_nexttoward.S b/sysdeps/ia64/fpu/s_nexttoward.S deleted file mode 100644 index 8e4c2c4943..0000000000 --- a/sysdeps/ia64/fpu/s_nexttoward.S +++ /dev/null @@ -1,488 +0,0 @@ -.file "nexttoward.s" - - -// Copyright (c) 2001 - 2004, Intel Corporation -// All rights reserved. -// -// -// 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 -//============================================================== -// 08/15/01 Initial version -// 08/23/01 Corrected error tag number -// 05/20/02 Cleaned up namespace and sf0 syntax -// 02/10/03 Reordered header: .section, .global, .proc, .align -// 12/14/04 Added error handling on underflow. -// -// API -//============================================================== -// double nexttoward( double x, long double y ); -// input floating point f8, f9 -// output floating point f8 -// -// Registers used -//============================================================== -GR_max_pexp = r14 -GR_min_pexp = r15 -GR_exp = r16 -GR_sig = r17 -GR_lnorm_sig = r18 -GR_sign_mask = r19 -GR_exp_mask = r20 -GR_sden_sig = r21 -GR_new_sig = r22 -GR_new_exp = r23 -GR_lden_sig = r24 -GR_snorm_sig = r25 -GR_exp1 = r26 -GR_x_exp = r27 -GR_min_den_rexp = r28 -// r36-39 parameters for libm_error_support - -GR_SAVE_B0 = r34 -GR_SAVE_GP = r35 -GR_SAVE_PFS = r32 - -GR_Parameter_X = r36 -GR_Parameter_Y = r37 -GR_Parameter_RESULT = r38 -GR_Parameter_TAG = r39 - -FR_lnorm_sig = f10 -FR_lnorm_exp = f11 -FR_lnorm = f12 -FR_sden_sig = f13 -FR_sden_exp = f14 -FR_sden = f15 -FR_save_f8 = f33 -FR_new_exp = f34 -FR_new_sig = f35 -FR_lden_sig = f36 -FR_snorm_sig = f37 -FR_exp1 = f38 -FR_tmp = f39 - -// -// Overview of operation -//============================================================== -// nexttoward determines the next representable value -// after x in the direction of y. - - -.section .text -GLOBAL_LIBM_ENTRY(nexttoward) - -// Extract signexp from x -// Is x < y ? p10 if yes, p11 if no -// Form smallest denormal significand = ulp size -{ .mfi - getf.exp GR_exp = f8 - fcmp.lt.s1 p10,p11 = f8, f9 - addl GR_sden_sig = 0x800, r0 -} -// Form largest normal significand 0xfffffffffffff800 -// Form smallest normal exponent -{ .mfi - addl GR_lnorm_sig = -0x800,r0 - nop.f 999 - addl GR_min_pexp = 0x0fc01, r0 ;; -} -// Extract significand from x -// Is x=y? -// Form largest normal exponent -{ .mfi - getf.sig GR_sig = f8 - fcmp.eq.s0 p6,p0 = f8, f9 - addl GR_max_pexp = 0x103fe, r0 -} -// Move largest normal significand to fp reg for special cases -{ .mfi - setf.sig FR_lnorm_sig = GR_lnorm_sig - nop.f 999 - addl GR_sign_mask = 0x20000, r0 ;; -} - -// Move smallest denormal significand and signexp to fp regs -// Is x=nan? -// Set p12 and p13 based on whether significand increases or decreases -// It increases (p12 set) if x<y and x>=0 or if x>y and x<0 -// It decreases (p13 set) if x<y and x<0 or if x>y and x>=0 -{ .mfi - setf.sig FR_sden_sig = GR_sden_sig - fclass.m p8,p0 = f8, 0xc3 -(p10) cmp.lt p12,p13 = GR_exp, GR_sign_mask -} -{ .mfi - setf.exp FR_sden_exp = GR_min_pexp -(p11) cmp.ge p12,p13 = GR_exp, GR_sign_mask ;; -} - -.pred.rel "mutex",p12,p13 - -// Form expected new significand, adding or subtracting 1 ulp increment -// If x=y set result to y -// Form smallest normal significand and largest denormal significand -{ .mfi -(p12) add GR_new_sig = GR_sig, GR_sden_sig -(p6) fnorm.d.s0 f8=f9 //Normalise - dep.z GR_snorm_sig = 1,63,1 // 0x8000000000000000 -} -{ .mlx -(p13) sub GR_new_sig = GR_sig, GR_sden_sig - movl GR_lden_sig = 0x7ffffffffffff800 ;; -} - -// Move expected result significand and signexp to fp regs -// Is y=nan? -// Form new exponent in case result exponent needs incrementing or decrementing -{ .mfi - setf.exp FR_new_exp = GR_exp - fclass.m p9,p0 = f9, 0xc3 -(p12) add GR_exp1 = 1, GR_exp -} -{ .mib - setf.sig FR_new_sig = GR_new_sig -(p13) add GR_exp1 = -1, GR_exp -(p6) br.ret.spnt b0 ;; // Exit if x=y -} - -// Move largest normal signexp to fp reg for special cases -// Is x=zero? -{ .mfi - setf.exp FR_lnorm_exp = GR_max_pexp - fclass.m p7,p0 = f8, 0x7 - nop.i 999 -} -{ .mfb - nop.m 999 -(p8) fma.s0 f8 = f8,f1,f9 -(p8) br.ret.spnt b0 ;; // Exit if x=nan -} - -// Move exp+-1 and smallest normal significand to fp regs for special cases -// Is x=inf? -{ .mfi - setf.exp FR_exp1 = GR_exp1 - fclass.m p6,p0 = f8, 0x23 - addl GR_exp_mask = 0x1ffff, r0 -} -{ .mfb - setf.sig FR_snorm_sig = GR_snorm_sig -(p9) fma.s0 f8 = f8,f1,f9 -(p9) br.ret.spnt b0 ;; // Exit if y=nan -} - -// Move largest denormal significand to fp regs for special cases -// Save x -{ .mfb - setf.sig FR_lden_sig = GR_lden_sig - mov FR_save_f8 = f8 -(p7) br.cond.spnt NEXT_ZERO ;; // Exit if x=0 -} - -// Mask off the sign to get x_exp -{ .mfb - and GR_x_exp = GR_exp_mask, GR_exp - nop.f 999 -(p6) br.cond.spnt NEXT_INF ;; // Exit if x=inf -} - -// Check 6 special cases when significand rolls over: -// 1 sig size incr, x_sig=max_sig, x_exp < max_exp -// Set p6, result is sig=min_sig, exp++ -// 2 sig size incr, x_sig=max_sig, x_exp >= max_exp -// Set p7, result is inf, signal overflow -// 3 sig size decr, x_sig=min_sig, x_exp > min_exp -// Set p8, result is sig=max_sig, exp-- -// 4 sig size decr, x_sig=min_sig, x_exp = min_exp -// Set p9, result is sig=max_den_sig, exp same, signal underflow and inexact -// 5 sig size decr, x_sig=min_den_sig, x_exp = min_exp -// Set p10, result is zero, sign of x, signal underflow and inexact -// 6 sig size decr, x_sig=min_sig, x_exp < min_exp -// Set p14, result is zero, sign of x, signal underflow and inexact -// -// Form exponent of smallest double denormal (if normalized register format) -{ .mmi - adds GR_min_den_rexp = -52, GR_min_pexp -(p12) cmp.eq.unc p6,p0 = GR_new_sig, r0 -(p13) cmp.eq.unc p8,p10 = GR_new_sig, GR_lden_sig ;; -} - -{ .mmi -(p6) cmp.lt.unc p6,p7 = GR_x_exp, GR_max_pexp -(p8) cmp.gt.unc p8,p9 = GR_x_exp, GR_min_pexp -(p10) cmp.eq.unc p10,p0 = GR_new_sig, r0 ;; -} - -// Create small normal in case need to generate underflow flag -{ .mfi -(p10) cmp.le.unc p10,p0 = GR_x_exp, GR_min_pexp - fmerge.se FR_tmp = FR_sden_exp, FR_lnorm_sig -(p9) cmp.gt.unc p9,p14 = GR_x_exp, GR_min_den_rexp -} -// Branch if cases 1, 2, 3 -{ .bbb -(p6) br.cond.spnt NEXT_EXPUP -(p7) br.cond.spnt NEXT_OVERFLOW -(p8) br.cond.spnt NEXT_EXPDOWN ;; -} - -// Branch if cases 4, 5, 6 -{ .bbb -(p9) br.cond.spnt NEXT_NORM_TO_DENORM -(p10) br.cond.spnt NEXT_UNDERFLOW_TO_ZERO -(p14) br.cond.spnt NEXT_UNDERFLOW_TO_ZERO ;; -} - -// Here if no special cases -// Set p6 if result will be a denormal, so can force underflow flag -// Case 1: x_exp=min_exp, x_sig=unnormalized -// Case 2: x_exp<min_exp -{ .mfi - cmp.lt p6,p7 = GR_x_exp, GR_min_pexp - fmerge.se f8 = FR_new_exp, FR_new_sig - nop.i 999 ;; -} - -{ .mfi - nop.m 999 - nop.f 999 -(p7) tbit.z p6,p0 = GR_new_sig, 63 ;; -} - -NEXT_COMMON_FINISH: -// Force underflow and inexact if denormal result -{ .mfi - nop.m 999 -(p6) fma.d.s0 FR_tmp = FR_tmp,FR_tmp,f0 - nop.i 999 -} -{ .mfb - nop.m 999 - fnorm.d.s0 f8 = f8 // Final normalization to result precision -(p6) br.cond.spnt NEXT_UNDERFLOW ;; -} - -{ .mfb - nop.m 999 - nop.f 999 - br.ret.sptk b0;; -} - -//Special cases -NEXT_EXPUP: -{ .mfb - cmp.lt p6,p7 = GR_x_exp, GR_min_pexp - fmerge.se f8 = FR_exp1, FR_snorm_sig - br.cond.sptk NEXT_COMMON_FINISH ;; -} - -NEXT_EXPDOWN: -{ .mfb - cmp.lt p6,p7 = GR_x_exp, GR_min_pexp - fmerge.se f8 = FR_exp1, FR_lnorm_sig - br.cond.sptk NEXT_COMMON_FINISH ;; -} - -NEXT_NORM_TO_DENORM: -{ .mfi - nop.m 999 - fmerge.se f8 = FR_new_exp, FR_lden_sig - nop.i 999 -} -// Force underflow and inexact if denormal result -{ .mfb - nop.m 999 - fma.d.s0 FR_tmp = FR_tmp,FR_tmp,f0 - br.cond.sptk NEXT_UNDERFLOW ;; -} - -NEXT_UNDERFLOW_TO_ZERO: -{ .mfb - cmp.eq p6,p0 = r0,r0 - fmerge.s f8 = FR_save_f8,f0 - br.cond.sptk NEXT_COMMON_FINISH ;; -} - -NEXT_INF: -// Here if f8 is +- infinity -// INF -// if f8 is +inf, no matter what y is return largest double -// if f8 is -inf, no matter what y is return -largest double - -{ .mfi - nop.m 999 - fmerge.se FR_lnorm = FR_lnorm_exp,FR_lnorm_sig - nop.i 999 ;; -} - -{ .mfb - nop.m 999 - fmerge.s f8 = f8,FR_lnorm - br.ret.sptk b0 ;; -} - -NEXT_ZERO: - -// Here if f8 is +- zero -// ZERO -// if f8 is zero and y is +, return + smallest double denormal -// if f8 is zero and y is -, return - smallest double denormal - -{ .mfi - nop.m 999 - fmerge.se FR_sden = FR_sden_exp,FR_sden_sig - nop.i 999 ;; -} - -// Create small normal to generate underflow flag -{ .mfi - nop.m 999 - fmerge.se FR_tmp = FR_sden_exp, FR_lnorm_sig - nop.i 999 ;; -} - -// Add correct sign from direction arg -{ .mfi - nop.m 999 - fmerge.s f8 = f9,FR_sden - nop.i 999 ;; -} - -// Force underflow and inexact flags -{ .mfb - nop.m 999 - fma.d.s0 FR_tmp = FR_tmp,FR_tmp,f0 - br.cond.sptk NEXT_UNDERFLOW ;; -} - -NEXT_UNDERFLOW: -// Here if result is a denorm, or input is finite and result is zero -// Call error support to report possible range error -{ .mib - alloc r32=ar.pfs,2,2,4,0 - mov GR_Parameter_TAG = 271 // Error code - br.cond.sptk __libm_error_region // Branch to error call -} -;; - -NEXT_OVERFLOW: -// Here if input is finite, but result will be infinite -// Use frcpa to generate infinity of correct sign -// Call error support to report possible range error -{ .mfi - alloc r32=ar.pfs,2,2,4,0 - frcpa.s1 f8,p6 = FR_save_f8, f0 - nop.i 999 ;; -} - -// Create largest double -{ .mfi - nop.m 999 - fmerge.se FR_lnorm = FR_lnorm_exp,FR_lnorm_sig - nop.i 999 ;; -} - -// Force overflow and inexact flags to be set -{ .mfb - mov GR_Parameter_TAG = 199 // Error code - fma.d.s0 FR_tmp = FR_lnorm,FR_lnorm,f0 - br.cond.sptk __libm_error_region // Branch to error call -} -;; - -GLOBAL_LIBM_END(nexttoward) - - -LOCAL_LIBM_ENTRY(__libm_error_region) -.prologue - -// (1) -{ .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 -};; - - -// (2) -{ .mmi - stfd [GR_Parameter_Y] = f9,16 // 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 -// (3) -{ .mib - stfd [GR_Parameter_X] = FR_save_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] = f8 // 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 - nop.m 0 - nop.m 0 - add GR_Parameter_RESULT = 48,sp -};; - -// (4) -{ .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 // Return -};; - -LOCAL_LIBM_END(__libm_error_region) - - -.type __libm_error_support#,@function -.global __libm_error_support# |