glibc/sysdeps/ia64/fpu/s_cbrtf.S
Siddhesh Poyarekar 30891f35fa Remove "Contributed by" lines
We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-09-03 22:06:44 +05:30

762 lines
29 KiB
ArmAsm

.file "cbrtf.s"
// Copyright (c) 2000 - 2003, 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
//==============================================================
// 02/02/00 Initial version
// 05/18/00 New version (modified algorithm)
// 05/20/02 Cleaned up namespace and sf0 syntax
// 01/28/03 Rescheduled some instructions for better performance
// on Itanium 2, and reformatted
//
// API
//==============================================================
// float cbrtf(float)
//
// Overview of operation
//==============================================================
// Background
//
// Implementation
//
// Let y= frcpa(a), where a is the argument
//
// cbrt(a)= cbrt(a*y)/cbrt(y) = cbrt(1 - (1-a*y)) * (1/cbrt(y))
//
// For all values of y, the 3 possible significands of 1/cbrt(y)
// are stored in a table (T0) to 64 bits of accuracy. (There are
// 3 possible significands because the exponent of y modulo 3
// can be 0, 1, or 2.)
//
//
// * cbrt(1 - (1-a*y)) is approximated by a degree-2 polynomial
//
// 1 - (1/3)*r - (1/9)*r^2
//
// in r = 1-a*y.
//
// The table values are stored for three exponent values and are
// then multiplied by 2^(e/3) where e is the exponent of the input number.
// This computation is carried out in parallel with the polynomial
// evaluation:
//
// T= 2^(e/3) * T0
//===============
// input= x
// C= frcpa(x)
// r= 1 - C * x
//
// Special values
//==============================================================
// Registers used
//==============================================================
// p6, p7, p8, p12
FR_R = f6
FR_COEFF1 = f7
FR_COEFF2 = f9
FR_T0 = f10
FR_T1 = f11
FR_T2 = f12
FR_2M63 = f13
FR_ARG = f14
FR_Y = f15
GR_GP = r2
GR_ADDR = r2
GR_TMP5 = r3
GR_CONST = r8
GR_TMP63 = r8
GR_SIGN = r9
GR_CT2 = r10
GR_CT3 = r11
GR_TMP4 = r14
GR_EBIAS3 = r15
GR_REM = r16
GR_SEXP = r17
GR_2P63 = r18
GR_SIGNIF = r19
GR_I1 = r20
GR_EBIAS = r21
GR_EXP = r22
GR_IT1 = r23
GR_E5 = r24
GR_IT1_3 = r25
GR_TP1 = r26
GR_TMP = r27
GR_TMP2 = r28
GR_TMP3 = r29
GR_EXP3 = r30
GR_ARGEXP = r31
// Data tables
//==============================================================
RODATA
.align 16
LOCAL_OBJECT_START(poly_coeffs)
data8 0xaaaab19b7e1f5ef9, 0x00003ffd // ~ 1/3
data8 0xe38e5192a5a8e56c, 0x00003ffb // ~ 1/9
LOCAL_OBJECT_END(poly_coeffs)
// For every entry B in the frcpa table, this table contains
// the significands of cbrt(1/B), cbrt(2/B), cbrt(4/B).
// The index to this table is the same as the frcpa index.
LOCAL_OBJECT_START(T_table)
data8 0x80155c748c374836, 0xa160019ed37fb4ae
data8 0xcb51ddcb9e93095e, 0x8040404b0879f7f9
data8 0xa1960b5966da4608, 0xcb95f333968ad59b
data8 0x806b5dce4b405c10, 0xa1cc5dbe6dc2aab4
data8 0xcbda64292d3ffd97, 0x8096b586974669b1
data8 0xa202f97995b69c0d, 0xcc1f3184af961596
data8 0x80bcd273d952a028, 0xa232fe6eb0c0577d
data8 0xcc5bb1ac954d33e2, 0x80e898c52813f2f3
data8 0xa26a2582012f6e17, 0xcca12e9831fc6402
data8 0x81149add67c2d208, 0xa2a197e5d10465cb
data8 0xcce70a67b64f24ad, 0x813b4e2c856b6e9a
data8 0xa2d25a532efefbc8, 0xcd24794726477ea5
data8 0x8167c1dde03de7aa, 0xa30a5bd6e49e4ab8
data8 0xcd6b096a0b70ee87, 0x818ed973b811135e
data8 0xa33b9c9b59879e24, 0xcda9177738b15a90
data8 0x81bbc0c33e13ec98, 0xa3742fca6a3c1f21
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data8 0xa4115ce30548bc15, 0xceb666b2c347d1de
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data8 0xcef609b0cb874f00, 0x8288dfe00e9b5eaf
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data8 0xed089ed5dcd99446, 0x9570130c1f9bb857
data8 0xbc47a2284fee4ff8, 0xed37bb95add09a1c
data8 0x9597ca4119525184, 0xbc79ac0916ed7b8a
data8 0xed76c70508f904b6, 0x95b5af6fb5aa4d3c
data8 0xbc9f5670d1a13030, 0xeda63bb05e7f93c6
data8 0x95d3ac9273aafd7a, 0xbcc51f068cb95c1d
data8 0xedd5d661daed2dc4, 0x95f1c1cafdfd3684
data8 0xbceb05f4b30a9bc0, 0xee05974eef86b903
data8 0x960fef3b430b8d5f, 0xbd110b6604c7d306
data8 0xee357ead791fc670, 0x962e350575b409c5
data8 0xbd372f8598620f19, 0xee658cb3c134a463
data8 0x964c934c0dfc1708, 0xbd5d727edb6b3c7e
data8 0xee95c1987f080211, 0x966b0a31c9c6bc7d
data8 0xbd83d47d937bbc6d, 0xeec61d92d8c4314f
data8 0x968999d9ad8d264e, 0xbdaa55addf1ae47d
data8 0xeef6a0da64a014ac, 0x96a8426705198795
data8 0xbdd0f63c36aa73f0, 0xef274ba72a07c811
data8 0x96c703fd64445ee5, 0xbdf7b6556d550a15
data8 0xef581e31a2c91260, 0x96e5dec0a7b4268d
data8 0xbe1e9626b1ffa96b, 0xef8918b2bc43aec6
data8 0x9704d2d4f59f79f3, 0xbe4595dd903e5371
data8 0xefba3b63d89d7cbf, 0x9723e05ebe91b9b0
data8 0xbe6cb5a7f14bc935, 0xefeb867ecffaa607
data8 0x97430782be323831, 0xbe93f5b41d047cf7
data8 0xf01cfa3df1b9c9fa, 0x97624865fc0df8bf
data8 0xbebb5630bae4c15f, 0xf04e96dc05b43e2d
data8 0x9781a32dcc640b2a, 0xbee2d74cd30a430c
data8 0xf0805c944d827454, 0x97a117ffd0f48e46
data8 0xbf0a7937cf38d981, 0xf0b24ba285c495cb
data8 0x97c0a701f9d263c9, 0xbf323c217be2bc8c
data8 0xf0e46442e76f6569, 0x97e0505a8637a036
data8 0xbf5a203a09342bbb, 0xf116a6b2291d7896
data8 0x97f57a9fb0b08c6e, 0xbf74cad1c14ebfc4
data8 0xf1383fa9e9b5b381, 0x9815503365914a9d
data8 0xbf9ce6a497a89f78, 0xf16ac84f90083b9b
data8 0x98354085054fd204, 0xbfc52428bec6e72f
data8 0xf19d7b686dcb03d7, 0x98554bbbf8a77902
data8 0xbfed838fddab024b, 0xf1d0593311db1757
data8 0x987571fffb7f94f6, 0xc016050c0420981a
data8 0xf20361ee8f1c711e, 0x9895b3791dd03c23
data8 0xc03ea8cfabddc330, 0xf23695da7de51d3f
data8 0x98ab43a5fc65d0c8, 0xc059d3cbd65ddbce
data8 0xf258d095e465cc35, 0x98cbb2d196bd713d
data8 0xc082b122a3c78c9d, 0xf28c4d0bfc982b34
data8 0x98ec3d9ec7b6f21a, 0xc0abb1499ae736c4
data8 0xf2bff55eb3f0ea71, 0x990ce436db5e8344
data8 0xc0d4d474c3aedaaf, 0xf2f3c9cf9884636e
data8 0x9922b8218160967a, 0xc0f054ca33eb3437
data8 0xf31670135ab9cc0f, 0x99438d686f75779d
data8 0xc119b2c67e600ed0, 0xf34a8e9f0b54cdfb
data8 0x99647eea131fa20b, 0xc1433453de2033ff
data8 0xf37ed9fa6b8add3f, 0x997a85045a47c6d0
data8 0xc15ef3e44e10032d, 0xf3a1cfe884ef6bb6
data8 0x999ba5f14f8add02, 0xc188b130431d80e6
data8 0xf3d66689dcc8e8d3, 0x99bce38b5465ecae
data8 0xc1b2929d6067730e, 0xf40b2ab069d5c96a
data8 0x99d31ca0887f30f9, 0xc1ce9268f31cc734
data8 0xf42e718b90c8bc16, 0x99f48a669c74c09e
data8 0xc1f8b0877c1b0c08, 0xf463822a0a3b4b00
data8 0x9a16154eb445c873, 0xc222f35a87b415ba
data8 0xf498c1076015faf8, 0x9a2c822ec198d667
data8 0xc23f3467349e5c88, 0xf4bc5a19a33990b5
data8 0x9a4e3e080cd91b78, 0xc269b4e40e088c01
data8 0xf4f1e6a7d6f5425f, 0x9a70177afe52322e
data8 0xc2945aac24daaf6e, 0xf527a232cf6be334
data8 0x9a86b8fa94eebe10, 0xc2b0de05e43c1d66
data8 0xf54b8ecdcda90851, 0x9aa8c42866ae2958
data8 0xc2dbc275e1229d09, 0xf5819949c7ad87b4
data8 0x9abf86f9e12fc45e, 0xc2f86fca9d80eeff
data8 0xf5a5bac9213b48a9, 0x9ae1c462fc05f49d
data8 0xc323938449a2587e, 0xf5dc1501f324a812
data8 0x9af8a8dc936b84d0, 0xc3406b40a538ed20
data8 0xf6006bee86b5589e, 0x9b1b19033be35730
data8 0xc36bcee8211d15e0, 0xf63716b2fa067fa4
data8 0x9b3da7daf04c2892, 0xc397593adf2ba366
data8 0xf66df22fb6132b9c, 0x9b54c2e4c8a9012b
data8 0xc3b475b6206155d5, 0xf6929fb98225deb1
data8 0x9b77854e6c661200, 0xc3e0410243b97383
data8 0xf6c9cd13021e3fea, 0x9b8ec2e678d56d2f
data8 0xc3fd890709833d37, 0xf6eeb177472cedae
data8 0x9ba60e6a5ca133b6, 0xc41ae295f7e7fa06
data8 0xf713abf4cb0b3afb, 0x9bc919ea66a151a4
data8 0xc44709f7bb8a4dd2, 0xf74b4d5333684ef1
data8 0x9be0887c09ef82bb, 0xc4648fb0e0bec4c1
data8 0xf7707f75a72f8e94, 0x9c03c8d5fffc3503
data8 0xc490f9a94695ba14, 0xf7a874b97927af44
data8 0x9c1b5ad21a81cbb9, 0xc4aeac0173b7d390
data8 0xf7cddf140aedf1d8, 0x9c3ed09216e9ca02
data8 0xc4db5941007aa853, 0xf806291bacb7f7a9
data8 0x9c568656c0423def, 0xc4f938aec206291a
data8 0xf82bcc43b92eafef, 0x9c7a320af242ce60
data8 0xc52629e899dfd622, 0xf8646bf0defb759e
data8 0x9c920bf7a8c01dc2, 0xc54436e44043b965
data8 0xf88a487dfc3ff5f7, 0x9ca9f475d98b159c
data8 0xc562563abf9ea07f, 0xf8b03c2b46cdc17f
data8 0x9ccdeca60e80b5f8, 0xc58fa7d1dc42921c
data8 0xf8e95541c152ae7a, 0x9ce5f9d4653d4902
data8 0xc5adf561b91e110a, 0xf90f832c2700c160
data8 0x9cfe15cb38bfdd8e, 0xc5cc5591bdbd82fa
data8 0xf935c88e0c7f419b, 0x9d225b983f6c1f96
data8 0xc5fa08f1ff20593c, 0xf96f5cd84fd86873
data8 0x9d3a9cca32261ed7, 0xc618980a79ce6862
data8 0xf995dd53ebdd9d6d, 0x9d52ecfccebe1768
data8 0xc6373a09e34b50fa, 0xf9bc75a034436a41
data8 0x9d77818d95b82f86, 0xc66550a6e0baaf35
data8 0xf9f686f26d5518de, 0x9d8ff7893fa4706c
data8 0xc6842241926342c9, 0xfa1d5b39b910a8c5
data8 0x9da87cbef36f2a5e, 0xc6a3070b7c93bb9e
data8 0xfa4447acc4ecbfd2, 0x9dcd6140b4a35aeb
data8 0xc6d18260bb84081b, 0xfa7ed7e51e6fdfb4
data8 0x9de60cd06dc6e2d4, 0xc6f0977c9416828b
data8 0xfaa601394d49a1a0, 0x9dfec7d4cc43b76f
data8 0xc70fc0117c641630, 0xfacd431644ce0e40
data8 0x9e17925ec9fccc4a, 0xc72efc34d7e615be
data8 0xfaf49d96f7a75909, 0x9e3cdf6db57dc075
data8 0xc75dfb441594141e, 0xfb2fd3c65e562fd5
data8 0x9e55d110b63637a8, 0xc77d68aa019bda4c
data8 0xfb576c5762024805, 0x9e6ed27594550d2e
data8 0xc79ce9ea478dbc4f, 0xfb7f1debc22c4040
data8 0x9e87e3adc385d393, 0xc7bc7f1ae453219d
data8 0xfba6e89f32d0190a, 0x9ead9b54b37a1055
data8 0xc7ec0476e15e141a, 0xfbe2c803a0894893
data8 0x9ec6d46a3d7de215, 0xc80bcbe16f1d540f
data8 0xfc0ad1ff0ed9ecf0, 0x9ee01d9108be3154
data8 0xc82ba78a5d349735, 0xfc32f57bdfbcbe7f
data8 0x9ef976db07288d04, 0xc84b978847a06b87
data8 0xfc5b32968f99b21c, 0x9f12e05a4759ec25
data8 0xc86b9bf1ee817bc6, 0xfc83896bc861ab08
data8 0x9f2c5a20f4da6668, 0xc88bb4de3667cdf4
data8 0xfcabfa1861ed4815, 0x9f52af78ed1733ca
data8 0xc8bc00e7fe9e23a3, 0xfce8d3cea7d3163e
data8 0x9f6c52426a39d003, 0xc8dc4d7ff2d25232
data8 0xfd118595143ee273, 0x9f860593d42fd7f3
data8 0xc8fcaeebcb40eb47, 0xfd3a519943d4865a
data8 0x9f9fc97fdb96bd51, 0xc91d25431426a663
data8 0xfd6337f8e1ae5a4b, 0x9fb99e194f4a7037
data8 0xc93db09d7fdb2949, 0xfd8c38d1c8e927eb
data8 0x9fd383731ca51db9, 0xc95e5112e721582a
data8 0xfdb5544205095a53, 0x9fed79a04fbf9423
data8 0xc97f06bb49787677, 0xfdde8a67d2613531
data8 0xa00780b413b24ee8, 0xc99fd1aecd6e1b06
data8 0xfe07db619e781611, 0xa02eab2c4474b0cd
data8 0xc9d12a3e27bb1625, 0xfe460768d80bf758
data8 0xa048dcd51ccfd142, 0xc9f22ad82ba3d5f0
data8 0xfe6f9bfb06cd32f6, 0xa0631fa894b11b8d
data8 0xca134113105e67b2, 0xfe994bcd3d14fcc2
data8 0xa07d73ba65e680af, 0xca346d07b045a876
data8 0xfec316fecaf3f2ab, 0xa097d91e6aaf71b0
data8 0xca55aecf0e94bb88, 0xfeecfdaf33fadb80
data8 0xa0b24fe89e02602f, 0xca77068257be9bab
data8 0xff16fffe2fa8fad6, 0xa0ccd82d1bd2f68b
data8 0xca98743ae1c693a8, 0xff411e0ba9db886d
data8 0xa0e77200215909e6, 0xcab9f8122c99a101
data8 0xff6b57f7c33e4e9a, 0xa1021d760d584855
data8 0xcadb9221e268c3b5, 0xff95ade2d1bd7358
data8 0xa11cdaa36068a57d, 0xcafd4283d8043dfd
data8 0xffc01fed60f86fb5, 0xa137a99cbd3f880b
data8 0xcb1f09520d37c6fb, 0xffeaae3832b63956
LOCAL_OBJECT_END(T_table)
.section .text
GLOBAL_LIBM_ENTRY(cbrtf)
{.mfi
getf.sig GR_SIGNIF = f8
// will continue only for normal/denormal numbers
fclass.nm.unc p12, p7 = f8, 0x1b
// GR_GP = pointer to C_1, C_2 followed by T_table
nop.i 0
}
{.mfi
addl GR_GP = @ltoff(poly_coeffs), gp
// normalize a
fma.s1 FR_ARG = f8, f1, f0
// GR_CT3 = bias-((2^8-1)/3) -63 = 0xffff-0x55-0x3f = 0xff6b
mov GR_CT3 = 0xff6b ;;
}
{.mmi
// get exponent
getf.exp GR_ARGEXP = f8
// load start address for C_1, C_2 followed by T_table
ld8 GR_ADDR = [ GR_GP ]
nop.i 0 ;;
}
{.mlx
// check if input significand is 0
(p7) cmp.eq p12, p7 = GR_SIGNIF, r0
// GR_2P63 = 2^63
movl GR_2P63 = 0x8000000000000000 ;;
}
{.mfi
nop.m 0
// y = frcpa(a)
// p7 = 1 for normal and denormal (but non-zero) arguments
(p7) frcpa.s0 FR_Y, p0 = f1, f8
// p9 = 1 if denormal input
cmp.gtu p9, p0 = GR_2P63, GR_SIGNIF
}
{.mfb
// load C_1
ldfe FR_COEFF1 = [ GR_ADDR ], 16
// if argument is 0, +/-Infinity, or NaN, return
(p12) fma.s.s0 f8 = f8, f1, f0
(p12) br.ret.spnt b0 ;;
}
{.mmi
// get normalized significand (for denormal inputs only)
(p9) getf.sig GR_SIGNIF = FR_ARG
// load C_2
ldfe FR_COEFF2 = [ GR_ADDR ], 16
// GR_CT2 = bias-(2^8-1)
mov GR_CT2 = 0xff00
}
{.mii
// get exponent (for denormal inputs only)
(p9) getf.exp GR_ARGEXP = FR_ARG
nop.i 0
mov GR_CONST = 0x20000 ;;
}
{.mii
// get GR_SIGN = sign
and GR_SIGN = GR_ARGEXP, GR_CONST
// eliminate leading 1 from GR_I1 = 1st table index
shl GR_I1 = GR_SIGNIF, 1
// eliminate sign from exponent
andcm GR_EBIAS = GR_ARGEXP, GR_CONST ;;
}
{.mfi
// subtract bias from GR_EXP = exponent
sub GR_EXP = GR_EBIAS, GR_CT2
// r = 1-a*y
fnma.s1 FR_R = FR_Y, FR_ARG, f1
// GR_IT1 = 1st table index (y_index8 bits)
shr.u GR_IT1 = GR_I1, 56 ;;
}
{.mii
// 1: exponent* = 5; // (2^{16}-1)/3 = 0x5555
shladd GR_E5 = GR_EXP, 2, GR_EXP
// GR_IT1_3 = 3*y_index
shladd GR_IT1_3 = GR_IT1, 1, GR_IT1
nop.i 0 ;;
}
{.mmi
// GR_TMP5 = (5*expon)*16+5*expon = (0x55)*expon
shladd GR_TMP5 = GR_E5, 4, GR_E5
// adjust T_table pointer by 1st index
shladd GR_TP1 = GR_IT1_3, 3, GR_ADDR
nop.i 0 ;;
}
{.mmi
// FR_T0 = T [ 0 ] [ y ]
ldf8 FR_T0 = [ GR_TP1 ], 8
// get 2^{-63}
mov GR_TMP63 = 0xffff + 63
// GR_TMP = (0x5500)*expon
shl GR_TMP = GR_TMP5, 8 ;;
}
{.mfi
// FR_T1 = T [ 1 ] [ y ]
ldf8 FR_T1 = [ GR_TP1 ], 8
// P_1 = C_1+C_2*r
fma.s1 FR_COEFF1 = FR_COEFF2, FR_R, FR_COEFF1
// GR_TMP2 = (0x5555)*expon
add GR_TMP2 = GR_TMP, GR_TMP5 ;;
}
{.mmi
// GR_TMP3 = (0x5556)*expon // 0x5556 = (2^{16}+2)/3
add GR_TMP3 = GR_TMP2, GR_EXP ;;
// FR_T2 = T [ 2 ] [ y ]
ldf8 FR_T2 = [ GR_TP1 ]
// GR_EXP3 = floor(expon/3)
shr GR_EXP3 = GR_TMP3, 16 ;;
}
{.mmi
setf.exp FR_2M63 = GR_TMP63
// GR_TMP4 = 3*exponent
shladd GR_TMP4 = GR_EXP3, 1, GR_EXP3
// bias exponent
add GR_EBIAS3 = GR_CT3, GR_EXP3 ;;
}
{.mmf
// get remainder of exponent/3
sub GR_REM = GR_EXP, GR_TMP4
// add sign to exponent
or GR_SEXP = GR_EBIAS3, GR_SIGN
// P_2 = -r*P_1
fnma.s1 FR_R = FR_COEFF1, FR_R, f0 ;;
}
{.mmi
// FR_ARG = sign*2^{exponent/3}
setf.exp FR_ARG = GR_SEXP
nop.m 0
// remainder = 0 ?
// p7=1 if input exponent is 3*j (remainder is 0)
cmp.eq.unc p7, p8 = r0, GR_REM ;;
}
{.mfi
// remainder = 1 ?
// p8=1 if input exponent is 3*j+1 (remainder is 1)
// p12=1 if input exponent is 3*j+2 (remainder is 2)
(p8) cmp.eq.unc p8, p12 = 1, GR_REM
// p7=1 -> remainder = 0 -> use T = FR_T0
(p7) fma.s1 f8 = FR_T0, FR_R, FR_T0
// argument is of the form 2^(3*k) ?
// ( GR_I1 holds significand bits, without the leading 1)
or GR_I1 = GR_I1, GR_REM ;;
}
.pred.rel "mutex", p12, p8
{.mfi
nop.m 0
// p8=1 -> remainder = 1 -> use FR_T1
(p8) fma.s1 f8 = FR_T1, FR_R, FR_T1
// argument is of the form 2^(3*k) ?
cmp.eq p14, p7 = GR_I1, r0
}
{.mfi
nop.m 0
// p12=1 -> remainder=2 -> result = T+T*P_2
(p12) fma.s1 f8 = FR_T2, FR_R, FR_T2
nop.i 0 ;;
}
.pred.rel "mutex", p14, p7
{.mfi
nop.m 0
// if argument is sgn*2^{3*(expon/3)}
(p14) fma.s.s0 f8 = FR_2M63, FR_ARG, f0
nop.i 0
}
{.mfb
nop.m 0
// T* = sgn*2^{expon/3}
(p7) fma.s.s0 f8 = f8, FR_ARG, f0
br.ret.sptk b0 ;;
}
GLOBAL_LIBM_END(cbrtf)
libm_alias_float_other (cbrt, cbrt)