4 // Copyright (c) 2000 - 2003, Intel Corporation
5 // All rights reserved.
7 // Contributed 2000 by the Intel Numerics Group, Intel Corporation
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10 // modification, are permitted provided that the following conditions are
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14 // notice, this list of conditions and the following disclaimer.
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17 // notice, this list of conditions and the following disclaimer in the
18 // documentation and/or other materials provided with the distribution.
20 // * The name of Intel Corporation may not be used to endorse or promote
21 // products derived from this software without specific prior written
24 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
25 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
26 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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38 // http://www.intel.com/software/products/opensource/libraries/num.htm.
40 //*********************************************************************
43 // 02/02/00 hand-optimized
44 // 04/04/00 Unwind support added
45 // 06/20/00 new version
46 // 08/15/00 Bundle added after call to __libm_error_support to properly
47 // set [the previously overwritten] GR_Parameter_RESULT.
48 // 05/20/02 Cleaned up namespace and sf0 syntax
49 // 02/10/03 Reordered header: .section, .global, .proc, .align
51 //*********************************************************************
53 // Function: hypotl(x,y) = |(x^2 + y^2) = for double extended values
55 // Also provides cabsl functionality.
57 //*********************************************************************
61 // Floating-Point Registers: f8 (Input and Return Value)
65 // General Purpose Registers:
68 // r37-r40 (Used to pass arguments to error handling routine)
70 // Predicate Registers: p6 - p10
72 //*********************************************************************
74 // IEEE Special Conditions:
76 // All faults and exceptions should be raised correctly.
77 // Overflow can occur.
78 // hypotl(Infinity and anything) = +Infinity
79 // hypotl(QNaN and anything) = QNaN
80 // hypotl(SNaN and anything ) = QNaN
82 //*********************************************************************
85 // x2 = x * x in double-extended
86 // y2 = y * y in double-extended
87 // temp = x2 + y2 in double-extended
88 // sqrt(temp) rounded to double extended
90 //*********************************************************************
97 GR_Parameter_RESULT = r38
98 GR_Parameter_TAG = r39
106 LOCAL_LIBM_ENTRY(cabsl)
107 LOCAL_LIBM_END(cabsl)
108 GLOBAL_IEEE754_ENTRY(hypotl)
110 alloc r32= ar.pfs,0,4,4,0
125 // Check if x is an Inf - if so return Inf even
126 // if y is a NaN (C9X)
127 fclass.m.unc p7, p6 = f8, 0x023
132 // if possible overflow, copy f8 to f32
133 // set Denormal, if necessary
140 // Check if y is an Inf - if so return Inf even
141 // if x is a NaN (C9X)
142 fclass.m.unc p8, p9 = f9, 0x023
147 // For x=inf, multiply y by 1 to raise invalid on y an SNaN
148 // (p7) fma.s0 f9=f9,f1,f0
149 // copy f9 to f33; set Denormal, if necessary
156 (p6) fclass.m p6,p0=f9,0x7
164 fma.s1 f12=f10,f1,f11
176 (p9) fclass.m p9,p0=f8,0x7
189 (p6) fclass.m p7,p0=f8,0x3f
215 (p9) fclass.m p8,p0=f9,0x3f
221 // if f8=Infinity or f9=Zero, return |f8|
222 (p7) fmerge.s f8=f0,f32
223 (p7) br.ret.spnt b0;;
235 // Identify Natvals, Infs, NaNs, and Zeros
237 fclass.m.unc p7, p0 = f12, 0x1E7
241 // get exponent of x^2+y^2
244 fma.s1 f13=f13,f1,f14
251 // if f9=Infinity or f8=Zero, return |f9|
252 (p8) fmerge.s f8=f0,f33
258 fnma.s1 f10=f10,f1,f12
265 (p6) fma.s1 f14=f12,f8,f0
271 (p6) fma.s1 f15=f8,f7,f0
277 // if special case, set f8
284 fnma.s1 f10=f10,f1,f34
303 (p6) fnma.s1 f7=f14,f15,f7
310 (p6) fma.s1 f11=f11,f7,f1
316 (p6) fma.s1 f9=f9,f7,f6
322 (p6) fma.s1 f34=f7,f7,f0
329 (p6) fma.s1 f6=f7,f14,f0
335 (p6) fma.s1 f7=f7,f15,f0
341 (p6) fma.s1 f11=f34,f9,f11
348 (p6) fma.s1 f14=f11,f6,f14
354 (p6) fma.s1 f15=f11,f7,f15
362 (p6) fnma.s1 f7=f14,f14,f12
366 // Is x^2 + y^2 well less than the overflow
368 (p6) cmp.lt.unc p7, p8 = r3,r2
370 (p6) fma.s1 f13=f13,f1,f10
377 (p6) fma.s1 f13=f7,f1,f13
384 fma.s0 f8=f13,f15,f14
385 // No overflow in this case
386 (p7) br.ret.sptk b0;;
391 (p8) fsetc.s2 0x7F,0x42
392 // Possible overflow path, must detect by
393 // Setting widest range exponent with prevailing
400 // bias+0x4000 (bias+EMAX+1)
403 (p8) fma.s2 f12=f13,f15,f14
407 (p8) setf.exp f11 = r2
408 (p8) fsetc.s2 0x7F,0x40
409 // Restore Original Mode in S2
414 (p8) fcmp.lt.unc.s1 p9, p10 = f12, f11
419 mov GR_Parameter_TAG = 45;
421 (p9) br.ret.sptk b0;;
423 GLOBAL_IEEE754_END(hypotl)
424 LOCAL_LIBM_ENTRY(__libm_error_region)
427 add GR_Parameter_Y=-32,sp // Parameter 2 value
429 .save ar.pfs,GR_SAVE_PFS
430 mov GR_SAVE_PFS=ar.pfs // Save ar.pfs
434 add sp=-64,sp // Create new stack
436 mov GR_SAVE_GP=gp // Save gp
439 stfe [GR_Parameter_Y] = FR_Y,16 // Save Parameter 2 on stack
440 add GR_Parameter_X = 16,sp // Parameter 1 address
442 mov GR_SAVE_B0=b0 // Save b0
446 stfe [GR_Parameter_X] = FR_X // Store Parameter 1 on stack
447 add GR_Parameter_RESULT = 0,GR_Parameter_Y
448 nop.b 0 // Parameter 3 address
451 stfe [GR_Parameter_Y] = FR_RESULT // Store Parameter 3 on stack
452 add GR_Parameter_Y = -16,GR_Parameter_Y
453 br.call.sptk b0=__libm_error_support# // Call error handling function
458 add GR_Parameter_RESULT = 48,sp
461 ldfe f8 = [GR_Parameter_RESULT] // Get return result off stack
463 add sp = 64,sp // Restore stack pointer
464 mov b0 = GR_SAVE_B0 // Restore return address
467 mov gp = GR_SAVE_GP // Restore gp
468 mov ar.pfs = GR_SAVE_PFS // Restore ar.pfs
469 br.ret.sptk b0 // Return
471 LOCAL_LIBM_END(__libm_error_region#)
472 .type __libm_error_support#,@function
473 .global __libm_error_support#