diff options
Diffstat (limited to 'REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf8_core_avx2.S')
| -rw-r--r-- | REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf8_core_avx2.S | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf8_core_avx2.S b/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf8_core_avx2.S new file mode 100644 index 0000000000..b4a070ac86 --- /dev/null +++ b/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf8_core_avx2.S @@ -0,0 +1,202 @@ +/* Function expf 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_s_expf_data.h" + + .text +ENTRY(_ZGVdN8v_expf_avx2) +/* + ALGORITHM DESCRIPTION: + + Argument representation: + M = rint(X*2^k/ln2) = 2^k*N+j + X = M*ln2/2^k + r = N*ln2 + ln2*(j/2^k) + r + then -ln2/2^(k+1) < r < ln2/2^(k+1) + Alternatively: + M = trunc(X*2^k/ln2) + then 0 < r < ln2/2^k + + Result calculation: + exp(X) = exp(N*ln2 + ln2*(j/2^k) + r) + = 2^N * 2^(j/2^k) * exp(r) + 2^N is calculated by bit manipulation + 2^(j/2^k) is computed from table lookup + exp(r) is approximated by polynomial + + The table lookup is skipped if k = 0. + For low accuracy approximation, exp(r) ~ 1 or 1+r. */ + + 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_sexp_data@GOTPCREL(%rip), %rax + vmovaps %ymm0, %ymm2 + vmovups __sInvLn2(%rax), %ymm7 + vmovups __sShifter(%rax), %ymm4 + vmovups __sLn2hi(%rax), %ymm3 + vmovups __sPC5(%rax), %ymm1 + +/* m = x*2^k/ln2 + shifter */ + vfmadd213ps %ymm4, %ymm2, %ymm7 + +/* n = m - shifter = rint(x*2^k/ln2) */ + vsubps %ymm4, %ymm7, %ymm0 + vpaddd __iBias(%rax), %ymm7, %ymm4 + +/* remove sign of x by "and" operation */ + vandps __iAbsMask(%rax), %ymm2, %ymm5 + +/* compare against threshold */ + vpcmpgtd __iDomainRange(%rax), %ymm5, %ymm6 + +/* r = x-n*ln2_hi/2^k */ + vmovaps %ymm2, %ymm5 + vfnmadd231ps %ymm0, %ymm3, %ymm5 + +/* r = r-n*ln2_lo/2^k = x - n*ln2/2^k */ + vfnmadd132ps __sLn2lo(%rax), %ymm5, %ymm0 + +/* c5*r+c4 */ + vfmadd213ps __sPC4(%rax), %ymm0, %ymm1 + +/* (c5*r+c4)*r+c3 */ + vfmadd213ps __sPC3(%rax), %ymm0, %ymm1 + +/* ((c5*r+c4)*r+c3)*r+c2 */ + vfmadd213ps __sPC2(%rax), %ymm0, %ymm1 + +/* (((c5*r+c4)*r+c3)*r+c2)*r+c1 */ + vfmadd213ps __sPC1(%rax), %ymm0, %ymm1 + +/* exp(r) = ((((c5*r+c4)*r+c3)*r+c2)*r+c1)*r+c0 */ + vfmadd213ps __sPC0(%rax), %ymm0, %ymm1 + +/* set mask for overflow/underflow */ + vmovmskps %ymm6, %ecx + +/* compute 2^N with "shift" */ + vpslld $23, %ymm4, %ymm6 + +/* 2^N*exp(r) */ + vmulps %ymm1, %ymm6, %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 + vmovups %ymm2, 320(%rsp) + vmovups %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 + vmovups 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 + vmovss 324(%rsp,%r15,8), %xmm0 + vzeroupper + + call JUMPTARGET(__expf_finite) + + vmovss %xmm0, 388(%rsp,%r15,8) + jmp .LBL_1_8 + +.LBL_1_12: + movzbl %r12b, %r15d + vmovss 320(%rsp,%r15,8), %xmm0 + vzeroupper + + call JUMPTARGET(__expf_finite) + + vmovss %xmm0, 384(%rsp,%r15,8) + jmp .LBL_1_7 + +END(_ZGVdN8v_expf_avx2) |