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Diffstat (limited to 'sysdeps/ia64/fpu/libm_scalblnf.S')
| -rw-r--r-- | sysdeps/ia64/fpu/libm_scalblnf.S | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/sysdeps/ia64/fpu/libm_scalblnf.S b/sysdeps/ia64/fpu/libm_scalblnf.S new file mode 100644 index 0000000000..362e68b641 --- /dev/null +++ b/sysdeps/ia64/fpu/libm_scalblnf.S @@ -0,0 +1,382 @@ +.file "libm_scalblnf.s" + + +// Copyright (c) 2001 - 2003, Intel Corporation +// All rights reserved. +// +// Contributed 2001 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 +//============================================================== +// 08/03/01 Initial version +// 08/23/01 Corrected error tag number +// 02/06/02 Corrected to handle 32- or 64-bit integers +// 05/20/02 Cleaned up namespace and sf0 syntax +// 02/10/03 Reordered header: .section, .global, .proc, .align +// +// API +//============================================================== +// float = __libm_scalblnf (float x, long int n, int long_int_type) +// input floating point f8 and long int n (r33) +// input long_int_type = 0 if long int defined as 32 bits, = 1 if 64 bits +// +// output floating point f8 +// + +// Returns x* 2**n using an fma and detects overflow +// and underflow. +// +// + +FR_Big = f6 +FR_NBig = f7 +FR_Floating_X = f8 +FR_Result = f8 +FR_Result2 = f9 +FR_Result3 = f11 +FR_Norm_X = f12 +FR_Two_N = f14 +FR_Two_to_Big = f15 + +GR_N_Biased = r15 +GR_Big = r16 +GR_NBig = r17 +GR_Scratch = r18 +GR_Scratch1 = r19 +GR_Bias = r20 +GR_N_as_int = r21 + +GR_SAVE_B0 = r32 +GR_SAVE_GP = r33 +GR_SAVE_PFS = r34 +GR_Parameter_X = r35 +GR_Parameter_Y = r36 +GR_Parameter_RESULT = r37 +GR_Tag = r38 + +.section .text +GLOBAL_LIBM_ENTRY(__libm_scalblnf) + +// +// Is x NAN, INF, ZERO, +-? +// Build the exponent Bias +// +{ .mfi + alloc r32=ar.pfs,3,0,4,0 + fclass.m.unc p7,p0 = FR_Floating_X, 0xe7 //@snan | @qnan | @inf | @zero + addl GR_Bias = 0x0FFFF,r0 +} + + +// +// Is N zero? +// Normalize x +// Do we need to sign extend input (long_int_type = 0)? +// +{ .mfi + cmp.eq.unc p6,p0 = r33,r0 + fnorm.s1 FR_Norm_X = FR_Floating_X + cmp.eq.unc p8,p9 = r34,r0 +} +;; + +{ .mii +(p9) mov GR_N_as_int = r33 // Get n directly if long int 64 bits +(p8) sxt4 GR_N_as_int = r33 // Sign extend n if long int 32 bits + nop.i 0 +} +;; + +// +// Normalize x +// Branch and return special values. +// Create -35000 +// Create 35000 +// +{ .mfi + addl GR_Big = 35000,r0 + nop.f 0 + add GR_N_Biased = GR_Bias,GR_N_as_int +} +{ .mfb + addl GR_NBig = -35000,r0 +(p7) fma.s.s0 FR_Result = FR_Floating_X,f1, f0 +(p7) br.ret.spnt b0 +};; + +// +// Build the exponent Bias +// Return x when N = 0 +// +{ .mfi + setf.exp FR_Two_N = GR_N_Biased + nop.f 0 + addl GR_Scratch1 = 0x063BF,r0 +} +{ .mfb + addl GR_Scratch = 0x019C3F,r0 +(p6) fma.s.s0 FR_Result = FR_Floating_X,f1, f0 +(p6) br.ret.spnt b0 +};; + +// +// Create 2*big +// Create 2**-big +// Is N > 35000 +// Is N < -35000 +// Raise Denormal operand flag with compare +// Main path, create 2**N +// +{ .mfi + setf.exp FR_NBig = GR_Scratch1 + nop.f 0 + cmp.ge.unc p6, p0 = GR_N_as_int, GR_Big +} +{ .mfi + setf.exp FR_Big = GR_Scratch + fcmp.ge.s0 p0,p11 = FR_Floating_X,f0 + cmp.le.unc p8, p0 = GR_N_as_int, GR_NBig +};; + +// +// Adjust 2**N if N was very small or very large +// +{ .mfi + nop.m 0 +(p6) fma.s1 FR_Two_N = FR_Big,f1,f0 + nop.i 0 +} +{ .mlx + nop.m 999 + movl GR_Scratch = 0x000000000003007F +};; + + +{ .mfi + nop.m 0 +(p8) fma.s1 FR_Two_N = FR_NBig,f1,f0 + nop.i 0 +} +{ .mlx + nop.m 999 + movl GR_Scratch1= 0x000000000001007F +};; + +// Set up necessary status fields +// +// S0 user supplied status +// S2 user supplied status + WRE + TD (Overflows) +// S3 user supplied status + FZ + TD (Underflows) +// +{ .mfi + nop.m 999 + fsetc.s3 0x7F,0x41 + nop.i 999 +} +{ .mfi + nop.m 999 + fsetc.s2 0x7F,0x42 + nop.i 999 +};; + +// +// Do final operation +// +{ .mfi + setf.exp FR_NBig = GR_Scratch + fma.s.s0 FR_Result = FR_Two_N,FR_Norm_X,f0 + nop.i 999 +} +{ .mfi + nop.m 999 + fma.s.s3 FR_Result3 = FR_Two_N,FR_Norm_X,f0 + nop.i 999 +};; +{ .mfi + setf.exp FR_Big = GR_Scratch1 + fma.s.s2 FR_Result2 = FR_Two_N,FR_Norm_X,f0 + nop.i 999 +};; + +// Check for overflow or underflow. +// Restore s3 +// Restore s2 +// +{ .mfi + nop.m 0 + fsetc.s3 0x7F,0x40 + nop.i 999 +} +{ .mfi + nop.m 0 + fsetc.s2 0x7F,0x40 + nop.i 999 +};; + +// +// Is the result zero? +// +{ .mfi + nop.m 999 + fclass.m.unc p6, p0 = FR_Result3, 0x007 + nop.i 999 +} +{ .mfi + addl GR_Tag = 205, r0 + fcmp.ge.unc.s1 p7, p8 = FR_Result2 , FR_Big + nop.i 0 +};; + +// +// Detect masked underflow - Tiny + Inexact Only +// +{ .mfi + nop.m 999 +(p6) fcmp.neq.unc.s1 p6, p0 = FR_Result , FR_Result2 + nop.i 999 +};; + +// +// Is result bigger the allowed range? +// Branch out for underflow +// +{ .mfb +(p6) addl GR_Tag = 206, r0 +(p8) fcmp.le.unc.s1 p9, p10 = FR_Result2 , FR_NBig +(p6) br.cond.spnt scalbnf_UNDERFLOW +};; + +// +// Branch out for overflow +// +{ .mbb + nop.m 0 +(p7) br.cond.spnt scalbnf_OVERFLOW +(p9) br.cond.spnt scalbnf_OVERFLOW +};; + +// +// Return from main path. +// +{ .mfb + nop.m 999 + nop.f 0 + br.ret.sptk b0;; +} + +GLOBAL_LIBM_END(__libm_scalblnf) +__libm_error_region: + +scalbnf_OVERFLOW: +scalbnf_UNDERFLOW: + +// +// Get stack address of N +// +.prologue +{ .mfi + add GR_Parameter_Y=-32,sp + nop.f 0 +.save ar.pfs,GR_SAVE_PFS + mov GR_SAVE_PFS=ar.pfs +} +// +// Adjust sp +// +{ .mfi +.fframe 64 + add sp=-64,sp + nop.f 0 + mov GR_SAVE_GP=gp +};; + +// +// Store N on stack in correct position +// Locate the address of x on stack +// +{ .mmi + st8 [GR_Parameter_Y] = GR_N_as_int,16 + add GR_Parameter_X = 16,sp +.save b0, GR_SAVE_B0 + mov GR_SAVE_B0=b0 +};; + +// +// Store x on the stack. +// Get address for result on stack. +// +.body +{ .mib + stfs [GR_Parameter_X] = FR_Norm_X + add GR_Parameter_RESULT = 0,GR_Parameter_Y + nop.b 0 +} +{ .mib + stfs [GR_Parameter_Y] = FR_Result + add GR_Parameter_Y = -16,GR_Parameter_Y + br.call.sptk b0=__libm_error_support# +};; + +// +// Get location of result on stack +// +{ .mmi + nop.m 0 + nop.m 0 + add GR_Parameter_RESULT = 48,sp +};; + +// +// Get the new result +// +{ .mmi + ldfs FR_Result = [GR_Parameter_RESULT] +.restore sp + add sp = 64,sp + mov b0 = GR_SAVE_B0 +};; + +// +// Restore gp, ar.pfs and return +// +{ .mib + mov gp = GR_SAVE_GP + mov ar.pfs = GR_SAVE_PFS + br.ret.sptk b0 +};; + +LOCAL_LIBM_END(__libm_error_region) + +.type __libm_error_support#,@function +.global __libm_error_support# |