diff options
Diffstat (limited to 'REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_d_log4_core_avx2.S')
| -rw-r--r-- | REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_d_log4_core_avx2.S | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_d_log4_core_avx2.S b/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_d_log4_core_avx2.S new file mode 100644 index 0000000000..04ea9e0071 --- /dev/null +++ b/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_d_log4_core_avx2.S @@ -0,0 +1,210 @@ +/* Function log 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_log_data.h" + + .text +ENTRY (_ZGVdN4v_log_avx2) +/* ALGORITHM DESCRIPTION: + + log(x) = -log(Rcp) + log(Rcp*x), + where Rcp ~ 1/x (accuracy ~9 bits, obtained by rounding + HW approximation to 1+9 mantissa bits) + + Reduced argument R=Rcp*x-1 is used to approximate log(1+R) as polynomial + + log(Rcp) = exponent_Rcp*log(2) + log(mantissa_Rcp) + -log(mantissa_Rcp) is obtained from a lookup table, + accessed by a 9-bit index + */ + 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_dlog_data@GOTPCREL(%rip), %rax + vmovdqa %ymm0, %ymm5 + +/* isolate exponent bits */ + vpsrlq $20, %ymm5, %ymm0 + +/* preserve mantissa, set input exponent to 2^(-10) */ + vandpd _ExpMask(%rax), %ymm5, %ymm6 + vorpd _Two10(%rax), %ymm6, %ymm4 + +/* reciprocal approximation good to at least 11 bits */ + vcvtpd2ps %ymm4, %xmm7 + vrcpps %xmm7, %xmm1 + vcmplt_oqpd _MinNorm(%rax), %ymm5, %ymm7 + vcvtps2pd %xmm1, %ymm3 + vcmpnle_uqpd _MaxNorm(%rax), %ymm5, %ymm1 + vextracti128 $1, %ymm0, %xmm2 + vshufps $221, %xmm2, %xmm0, %xmm6 + +/* round reciprocal to nearest integer, will have 1+9 mantissa bits */ + vroundpd $0, %ymm3, %ymm2 + +/* convert biased exponent to DP format */ + vcvtdq2pd %xmm6, %ymm0 + +/* combine and get argument value range mask */ + vorpd %ymm1, %ymm7, %ymm3 + vmovupd _One(%rax), %ymm1 + vmovmskpd %ymm3, %ecx + +/* calculate index for table lookup */ + vpsrlq $40, %ymm2, %ymm3 + +/* argument reduction started: R = Mantissa*Rcp - 1 */ + vfmsub213pd %ymm1, %ymm2, %ymm4 + vcmpgt_oqpd _Threshold(%rax), %ymm2, %ymm2 + vpcmpeqd %ymm6, %ymm6, %ymm6 + vxorpd %ymm1, %ymm1, %ymm1 + vgatherqpd %ymm6, _LogRcp_lookup(%rax,%ymm3), %ymm1 + +/* exponent*log(2.0) */ + vmovupd _poly_coeff_1(%rax), %ymm6 + vmulpd %ymm4, %ymm4, %ymm3 + +/* polynomial computation */ + vfmadd213pd _poly_coeff_2(%rax), %ymm4, %ymm6 + vandpd _Bias(%rax), %ymm2, %ymm7 + vorpd _Bias1(%rax), %ymm7, %ymm2 + +/* + Table stores -log(0.5*mantissa) for larger mantissas, + adjust exponent accordingly + */ + vsubpd %ymm2, %ymm0, %ymm0 + vmovupd _poly_coeff_3(%rax), %ymm2 + vfmadd213pd _poly_coeff_4(%rax), %ymm4, %ymm2 + vfmadd213pd %ymm2, %ymm3, %ymm6 + +/* + reconstruction: + (exponent*log(2)) + (LogRcp + (R+poly)) + */ + vfmadd213pd %ymm4, %ymm3, %ymm6 + vaddpd %ymm1, %ymm6, %ymm4 + vfmadd132pd _L2(%rax), %ymm4, %ymm0 + testl %ecx, %ecx + jne .LBL_1_3 + +.LBL_1_2: + cfi_remember_state + 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 %ymm5, 320(%rsp) + vmovupd %ymm0, 384(%rsp) + je .LBL_1_2 + + xorb %dl, %dl + xorl %eax, %eax + vmovups %ymm8, 224(%rsp) + vmovups %ymm9, 192(%rsp) + vmovups %ymm10, 160(%rsp) + vmovups %ymm11, 128(%rsp) + vmovups %ymm12, 96(%rsp) + vmovups %ymm13, 64(%rsp) + vmovups %ymm14, 32(%rsp) + vmovups %ymm15, (%rsp) + movq %rsi, 264(%rsp) + movq %rdi, 256(%rsp) + movq %r12, 296(%rsp) + cfi_offset_rel_rsp (12, 296) + movb %dl, %r12b + movq %r13, 288(%rsp) + cfi_offset_rel_rsp (13, 288) + movl %ecx, %r13d + movq %r14, 280(%rsp) + cfi_offset_rel_rsp (14, 280) + movl %eax, %r14d + movq %r15, 272(%rsp) + cfi_offset_rel_rsp (15, 272) + 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 224(%rsp), %ymm8 + vmovups 192(%rsp), %ymm9 + vmovups 160(%rsp), %ymm10 + vmovups 128(%rsp), %ymm11 + vmovups 96(%rsp), %ymm12 + vmovups 64(%rsp), %ymm13 + vmovups 32(%rsp), %ymm14 + vmovups (%rsp), %ymm15 + vmovupd 384(%rsp), %ymm0 + movq 264(%rsp), %rsi + movq 256(%rsp), %rdi + movq 296(%rsp), %r12 + cfi_restore (%r12) + movq 288(%rsp), %r13 + cfi_restore (%r13) + movq 280(%rsp), %r14 + cfi_restore (%r14) + movq 272(%rsp), %r15 + cfi_restore (%r15) + jmp .LBL_1_2 + +.LBL_1_10: + cfi_restore_state + movzbl %r12b, %r15d + shlq $4, %r15 + vmovsd 328(%rsp,%r15), %xmm0 + vzeroupper + + call JUMPTARGET(__log_finite) + + vmovsd %xmm0, 392(%rsp,%r15) + jmp .LBL_1_8 + +.LBL_1_12: + movzbl %r12b, %r15d + shlq $4, %r15 + vmovsd 320(%rsp,%r15), %xmm0 + vzeroupper + + call JUMPTARGET(__log_finite) + + vmovsd %xmm0, 384(%rsp,%r15) + jmp .LBL_1_7 + +END (_ZGVdN4v_log_avx2) |