Prepare for radical source tree reorganization. zack/build-layout-experiment

All top-level files and directories are moved into a temporary storage
directory, REORG.TODO, except for files that will certainly still
exist in their current form at top level when we're done (COPYING,
COPYING.LIB, LICENSES, NEWS, README), all old ChangeLog files (which
are moved to the new directory OldChangeLogs, instead), and the
generated file INSTALL (which is just deleted; in the new order, there
will be no generated files checked into version control).

1 files changed, 387 insertions, 0 deletions

diff --git a/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_d_pow4_core_avx2.S b/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_d_pow4_core_avx2.S
new file mode 100644
index 0000000000..3092328909
--- /dev/null
+++ b/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_d_pow4_core_avx2.S
@@ -0,0 +1,387 @@
+/* Function pow vectorized with AVX2.
+   Copyright (C) 2014-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+#include "svml_d_pow_data.h"
+
+	.text
+ENTRY (_ZGVdN4vv_pow_avx2)
+/*
+   ALGORITHM DESCRIPTION:
+
+     1) Calculating log2|x|
+     Here we use the following formula.
+     Let |x|=2^k1*X1, where k1 is integer, 1<=X1<2.
+     Let C ~= 1/ln(2),
+     Rcp1 ~= 1/X1,   X2=Rcp1*X1,
+     Rcp2 ~= 1/X2,   X3=Rcp2*X2,
+     Rcp3 ~= 1/X3,   Rcp3C ~= C/X3.
+     Then
+     log2|x| = k1 + log2(1/Rcp1) + log2(1/Rcp2) + log2(C/Rcp3C) +
+               log2(X1*Rcp1*Rcp2*Rcp3C/C),
+     where X1*Rcp1*Rcp2*Rcp3C = C*(1+q), q is very small.
+
+     The values of Rcp1, log2(1/Rcp1), Rcp2, log2(1/Rcp2),
+     Rcp3C, log2(C/Rcp3C) are taken from tables.
+     Values of Rcp1, Rcp2, Rcp3C are such that RcpC=Rcp1*Rcp2*Rcp3C
+     is exactly represented in target precision.
+
+     log2(X1*Rcp1*Rcp2*Rcp3C/C) = log2(1+q) = ln(1+q)/ln2 =
+     = 1/(ln2)*q - 1/(2ln2)*q^2 + 1/(3ln2)*q^3 - ... =
+     = 1/(C*ln2)*cq - 1/(2*C^2*ln2)*cq^2 + 1/(3*C^3*ln2)*cq^3 - ... =
+     = (1 + a1)*cq + a2*cq^2 + a3*cq^3 + ...,
+     where cq = X1*Rcp1*Rcp2*Rcp3C-C,
+     a1=1/(C*ln(2))-1 is small,
+     a2=1/(2*C^2*ln2),
+     a3=1/(3*C^3*ln2),
+     ...
+     We get 3 parts of log2 result: HH+HL+HLL ~= log2|x|.
+
+     2)  Calculation of y*(HH+HL+HLL).
+     Split y into YHi+YLo.
+     Get high PH and medium PL parts of y*log2|x|.
+     Get low PLL part of y*log2|x|.
+     Now we have PH+PL+PLL ~= y*log2|x|.
+
+     3) Calculation of 2^(PH+PL+PLL).
+     Mathematical idea of computing 2^(PH+PL+PLL) is the following.
+     Let's represent PH+PL+PLL in the form N + j/2^expK + Z,
+     where expK=7 in this implementation, N and j are integers,
+     0<=j<=2^expK-1, |Z|<2^(-expK-1).
+     Hence 2^(PH+PL+PLL) ~= 2^N * 2^(j/2^expK) * 2^Z,
+     where 2^(j/2^expK) is stored in a table, and
+     2^Z ~= 1 + B1*Z + B2*Z^2 ... + B5*Z^5.
+
+     We compute 2^(PH+PL+PLL) as follows.
+     Break PH into PHH + PHL, where PHH = N + j/2^expK.
+     Z = PHL + PL + PLL
+     Exp2Poly = B1*Z + B2*Z^2 ... + B5*Z^5
+     Get 2^(j/2^expK) from table in the form THI+TLO.
+     Now we have 2^(PH+PL+PLL) ~= 2^N * (THI + TLO) * (1 + Exp2Poly).
+
+     Get significand of 2^(PH+PL+PLL) in the form ResHi+ResLo:
+     ResHi := THI
+     ResLo := THI * Exp2Poly + TLO
+
+     Get exponent ERes of the result:
+     Res := ResHi + ResLo:
+     Result := ex(Res) + N.  */
+
+        pushq     %rbp
+        cfi_adjust_cfa_offset (8)
+        cfi_rel_offset (%rbp, 0)
+        movq      %rsp, %rbp
+        cfi_def_cfa_register (%rbp)
+        andq      $-64, %rsp
+        subq      $448, %rsp
+        movq      __svml_dpow_data@GOTPCREL(%rip), %rax
+        vmovups   %ymm11, 160(%rsp)
+        vmovups   %ymm8, 224(%rsp)
+        vmovups   %ymm10, 352(%rsp)
+        vmovups   %ymm9, 384(%rsp)
+        vmovups   %ymm13, 288(%rsp)
+        vmovapd   %ymm1, %ymm11
+        vxorpd    %ymm1, %ymm1, %ymm1
+        vextracti128 $1, %ymm0, %xmm5
+        vshufps   $221, %xmm5, %xmm0, %xmm5
+
+/* i = (((Hi(x) & 0x000ffe00) + 0x00000200) >> 10); -> i = (b1..b11 + 1) / 2 */
+        vandps _iIndexMask(%rax), %xmm5, %xmm3
+        vpaddd _iIndexAdd(%rax), %xmm3, %xmm6
+        vpsrld    $10, %xmm6, %xmm8
+
+/* Index for reciprocal table */
+        vpslld    $3, %xmm8, %xmm9
+
+/* Index for log2 table */
+        vpslld    $4, %xmm8, %xmm6
+
+/* x1 = x; Hi(x1) = (Hi(x1)&0x000fffff)|0x3ff00000 */
+        vandpd _iMantissaMask(%rax), %ymm0, %ymm4
+        vorpd _dbOne(%rax), %ymm4, %ymm13
+        vpcmpeqd  %ymm4, %ymm4, %ymm4
+        vpcmpeqd  %ymm8, %ymm8, %ymm8
+
+/* k = Hi(x); k = k - 0x3fe7fe00; k = k >> 20 */
+        vpsubd _i3fe7fe00(%rax), %xmm5, %xmm3
+        vpaddd _HIDELTA(%rax), %xmm5, %xmm5
+        vextracti128 $1, %ymm11, %xmm7
+        vshufps   $221, %xmm7, %xmm11, %xmm2
+        vpand _ABSMASK(%rax), %xmm2, %xmm10
+        vpcmpeqd  %ymm2, %ymm2, %ymm2
+        vgatherdpd %ymm2, 11712(%rax,%xmm9), %ymm1
+        vmovups _LORANGE(%rax), %xmm7
+        vxorpd    %ymm2, %ymm2, %ymm2
+        vgatherdpd %ymm4, 19968(%rax,%xmm6), %ymm2
+        vxorpd    %ymm4, %ymm4, %ymm4
+        vgatherdpd %ymm8, 19976(%rax,%xmm6), %ymm4
+        vpsrad    $20, %xmm3, %xmm6
+        vpaddd _i2p20_2p19(%rax), %xmm6, %xmm9
+        vpshufd   $80, %xmm9, %xmm8
+        vpshufd   $250, %xmm9, %xmm3
+
+/* x1Hi=x1; Lo(x1Hi)&=0xf8000000; x1Lo = x1-x1Hi */
+        vandpd _iHighMask(%rax), %ymm13, %ymm9
+        vinserti128 $1, %xmm3, %ymm8, %ymm6
+        vandpd _iffffffff00000000(%rax), %ymm6, %ymm8
+
+/* r1 = x1*rcp1 */
+        vmulpd    %ymm1, %ymm13, %ymm6
+        vsubpd    %ymm9, %ymm13, %ymm3
+        vsubpd _db2p20_2p19(%rax), %ymm8, %ymm8
+
+/* cq = c+r1 */
+        vaddpd _LHN(%rax), %ymm6, %ymm13
+
+/* E = -r1+__fence(x1Hi*rcp1) */
+        vfmsub213pd %ymm6, %ymm1, %ymm9
+
+/* E=E+x1Lo*rcp1 */
+        vfmadd213pd %ymm9, %ymm1, %ymm3
+
+/* T = k + L1hi */
+        vaddpd    %ymm2, %ymm8, %ymm1
+
+/* T_Rh = T + cq */
+        vaddpd    %ymm13, %ymm1, %ymm8
+
+/* Rl = T-T_Rh; -> -Rh */
+        vsubpd    %ymm8, %ymm1, %ymm6
+
+/* Rl=Rl+cq */
+        vaddpd    %ymm6, %ymm13, %ymm1
+
+/* T_Rh_Eh = T_Rh + E */
+        vaddpd    %ymm3, %ymm8, %ymm6
+
+/* cq = cq + E */
+        vaddpd    %ymm3, %ymm13, %ymm13
+
+/* HLL = T_Rh - T_Rh_Eh; -> -Eh */
+        vsubpd    %ymm6, %ymm8, %ymm9
+
+/* HLL+=E;  -> El */
+        vaddpd    %ymm9, %ymm3, %ymm2
+
+/* HLL+=Rl */
+        vaddpd    %ymm1, %ymm2, %ymm8
+
+/* HLL+=L1lo */
+        vaddpd    %ymm4, %ymm8, %ymm4
+        vmovupd _clv_2(%rax), %ymm8
+
+/* HLL = HLL + (((((((a7)*cq+a6)*cq+a5)*cq+a4)*cq+a3)*cq+a2)*cq+a1)*cq */
+        vfmadd213pd _clv_3(%rax), %ymm13, %ymm8
+        vfmadd213pd _clv_4(%rax), %ymm13, %ymm8
+        vfmadd213pd _clv_5(%rax), %ymm13, %ymm8
+        vfmadd213pd _clv_6(%rax), %ymm13, %ymm8
+        vfmadd213pd _clv_7(%rax), %ymm13, %ymm8
+        vfmadd213pd %ymm4, %ymm13, %ymm8
+
+/* T_Rh_Eh_HLLhi = T_Rh_Eh + HLL */
+        vaddpd    %ymm8, %ymm6, %ymm9
+
+/* HH = T_Rh_Eh_HLLhi; Lo(HH)&=0xf8000000 */
+        vandpd _iHighMask(%rax), %ymm9, %ymm2
+
+/*
+   2^(y*(HH+HL+HLL)) starts here:
+   yH = y; Lo(yH)&=0xf8000000;
+ */
+        vandpd _iHighMask(%rax), %ymm11, %ymm1
+
+/* HLLhi = T_Rh_Eh_HLLhi - T_Rh_Eh */
+        vsubpd    %ymm6, %ymm9, %ymm13
+
+/* HL = T_Rh_Eh_HLLhi-HH */
+        vsubpd    %ymm2, %ymm9, %ymm4
+
+/* pH = yH*HH */
+        vmulpd    %ymm2, %ymm1, %ymm9
+
+/* HLL = HLL - HLLhi */
+        vsubpd    %ymm13, %ymm8, %ymm6
+
+/* yL = y-yH */
+        vsubpd    %ymm1, %ymm11, %ymm8
+        vextracti128 $1, %ymm9, %xmm3
+        vshufps   $221, %xmm3, %xmm9, %xmm13
+        vpand _ABSMASK(%rax), %xmm13, %xmm3
+        vpcmpgtd  %xmm5, %xmm7, %xmm13
+        vpcmpgtd _INF(%rax), %xmm10, %xmm7
+        vpcmpeqd _INF(%rax), %xmm10, %xmm10
+        vpor      %xmm10, %xmm7, %xmm7
+        vpor      %xmm7, %xmm13, %xmm5
+
+/* pL=yL*HL+yH*HL; pL+=yL*HH */
+        vmulpd    %ymm4, %ymm8, %ymm7
+        vpcmpgtd _DOMAINRANGE(%rax), %xmm3, %xmm13
+        vpcmpeqd _DOMAINRANGE(%rax), %xmm3, %xmm10
+        vpor      %xmm10, %xmm13, %xmm3
+        vpor      %xmm3, %xmm5, %xmm13
+        vfmadd213pd %ymm7, %ymm4, %ymm1
+
+/* pLL = y*HLL;
+   pHH = pH + *(double*)&db2p45_2p44
+ */
+        vaddpd _db2p45_2p44(%rax), %ymm9, %ymm7
+        vmovmskps %xmm13, %ecx
+        vfmadd213pd %ymm1, %ymm2, %ymm8
+
+/* t=pL+pLL; t+=pHL */
+        vfmadd231pd %ymm11, %ymm6, %ymm8
+        vextracti128 $1, %ymm7, %xmm1
+        vshufps   $136, %xmm1, %xmm7, %xmm10
+
+/* _n = Lo(pHH);
+   _n = _n & 0xffffff80;
+   _n = _n >> 7;
+   Hi(_2n) = (0x3ff+_n)<<20; Lo(_2n) = 0; -> 2^n
+ */
+        vpslld    $13, %xmm10, %xmm2
+        vpaddd _iOne(%rax), %xmm2, %xmm13
+        vpshufd   $80, %xmm13, %xmm4
+        vpshufd   $250, %xmm13, %xmm1
+
+/* j = Lo(pHH)&0x0000007f */
+        vandps _jIndexMask(%rax), %xmm10, %xmm3
+
+/* T1 = ((double*)exp2_tbl)[ 2*j ] */
+        vpcmpeqd  %ymm10, %ymm10, %ymm10
+        vpslld    $4, %xmm3, %xmm5
+
+/* pHH = pHH - *(double*)&db2p45_2p44 */
+        vsubpd _db2p45_2p44(%rax), %ymm7, %ymm7
+
+/* pHL = pH - pHH */
+        vsubpd    %ymm7, %ymm9, %ymm9
+        vaddpd    %ymm9, %ymm8, %ymm6
+        vinserti128 $1, %xmm1, %ymm4, %ymm2
+        vxorpd    %ymm1, %ymm1, %ymm1
+        vgatherdpd %ymm10, 36416(%rax,%xmm5), %ymm1
+        vandpd _ifff0000000000000(%rax), %ymm2, %ymm13
+        vmovupd _cev_1(%rax), %ymm2
+        vmulpd    %ymm1, %ymm13, %ymm1
+        vfmadd213pd _cev_2(%rax), %ymm6, %ymm2
+        vmulpd    %ymm6, %ymm1, %ymm8
+        vfmadd213pd _cev_3(%rax), %ymm6, %ymm2
+        vfmadd213pd _cev_4(%rax), %ymm6, %ymm2
+        vfmadd213pd _cev_5(%rax), %ymm6, %ymm2
+        vfmadd213pd %ymm1, %ymm8, %ymm2
+        testl     %ecx, %ecx
+        jne       .LBL_1_3
+
+.LBL_1_2:
+        cfi_remember_state
+        vmovups   224(%rsp), %ymm8
+        vmovups   384(%rsp), %ymm9
+        vmovups   352(%rsp), %ymm10
+        vmovups   160(%rsp), %ymm11
+        vmovups   288(%rsp), %ymm13
+        vmovdqa   %ymm2, %ymm0
+        movq      %rbp, %rsp
+        cfi_def_cfa_register (%rsp)
+        popq      %rbp
+        cfi_adjust_cfa_offset (-8)
+        cfi_restore (%rbp)
+        ret
+
+.LBL_1_3:
+        cfi_restore_state
+        vmovupd   %ymm0, 192(%rsp)
+        vmovupd   %ymm11, 256(%rsp)
+        vmovupd   %ymm2, 320(%rsp)
+        je        .LBL_1_2
+
+        xorb      %dl, %dl
+        xorl      %eax, %eax
+        vmovups   %ymm12, 64(%rsp)
+        vmovups   %ymm14, 32(%rsp)
+        vmovups   %ymm15, (%rsp)
+        movq      %rsi, 104(%rsp)
+        movq      %rdi, 96(%rsp)
+        movq      %r12, 136(%rsp)
+        cfi_offset_rel_rsp (12, 136)
+        movb      %dl, %r12b
+        movq      %r13, 128(%rsp)
+        cfi_offset_rel_rsp (13, 128)
+        movl      %ecx, %r13d
+        movq      %r14, 120(%rsp)
+        cfi_offset_rel_rsp (14, 120)
+        movl      %eax, %r14d
+        movq      %r15, 112(%rsp)
+        cfi_offset_rel_rsp (15, 112)
+        cfi_remember_state
+
+.LBL_1_6:
+        btl       %r14d, %r13d
+        jc        .LBL_1_12
+
+.LBL_1_7:
+        lea       1(%r14), %esi
+        btl       %esi, %r13d
+        jc        .LBL_1_10
+
+.LBL_1_8:
+        incb      %r12b
+        addl      $2, %r14d
+        cmpb      $16, %r12b
+        jb        .LBL_1_6
+
+        vmovups   64(%rsp), %ymm12
+        vmovups   32(%rsp), %ymm14
+        vmovups   (%rsp), %ymm15
+        vmovupd   320(%rsp), %ymm2
+        movq      104(%rsp), %rsi
+        movq      96(%rsp), %rdi
+        movq      136(%rsp), %r12
+        cfi_restore (%r12)
+        movq      128(%rsp), %r13
+        cfi_restore (%r13)
+        movq      120(%rsp), %r14
+        cfi_restore (%r14)
+        movq      112(%rsp), %r15
+        cfi_restore (%r15)
+        jmp       .LBL_1_2
+
+.LBL_1_10:
+        cfi_restore_state
+        movzbl    %r12b, %r15d
+        shlq      $4, %r15
+        vmovsd    200(%rsp,%r15), %xmm0
+        vmovsd    264(%rsp,%r15), %xmm1
+        vzeroupper
+
+        call      JUMPTARGET(__pow_finite)
+
+        vmovsd    %xmm0, 328(%rsp,%r15)
+        jmp       .LBL_1_8
+
+.LBL_1_12:
+        movzbl    %r12b, %r15d
+        shlq      $4, %r15
+        vmovsd    192(%rsp,%r15), %xmm0
+        vmovsd    256(%rsp,%r15), %xmm1
+        vzeroupper
+
+        call      JUMPTARGET(__pow_finite)
+
+        vmovsd    %xmm0, 320(%rsp,%r15)
+        jmp       .LBL_1_7
+
+END (_ZGVdN4vv_pow_avx2)