diff options
Diffstat (limited to 'REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf4_core_sse4.S')
| -rw-r--r-- | REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf4_core_sse4.S | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf4_core_sse4.S b/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf4_core_sse4.S new file mode 100644 index 0000000000..2bc510bbf7 --- /dev/null +++ b/REORG.TODO/sysdeps/x86_64/fpu/multiarch/svml_s_expf4_core_sse4.S @@ -0,0 +1,212 @@ +/* Function expf vectorized with SSE4. + 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 (_ZGVbN4v_expf_sse4) +/* + 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 $320, %rsp + movaps %xmm0, %xmm5 + movq __svml_sexp_data@GOTPCREL(%rip), %rax + movups __sInvLn2(%rax), %xmm0 + +/* m = x*2^k/ln2 + shifter */ + mulps %xmm5, %xmm0 + movups __sShifter(%rax), %xmm6 + movups __sLn2hi(%rax), %xmm4 + addps %xmm6, %xmm0 + +/* n = m - shifter = rint(x*2^k/ln2) */ + movaps %xmm0, %xmm2 + +/* remove sign of x by "and" operation */ + movdqu __iAbsMask(%rax), %xmm7 + subps %xmm6, %xmm2 + +/* r = x-n*ln2_hi/2^k */ + mulps %xmm2, %xmm4 + pand %xmm5, %xmm7 + +/* compare against threshold */ + pcmpgtd __iDomainRange(%rax), %xmm7 + movups __sLn2lo(%rax), %xmm1 + +/* set mask for overflow/underflow */ + movmskps %xmm7, %ecx + movaps %xmm5, %xmm7 + movups __sPC5(%rax), %xmm3 + subps %xmm4, %xmm7 + +/* r = r-n*ln2_lo/2^k = x - n*ln2/2^k */ + mulps %xmm1, %xmm2 + +/* compute 2^N with "shift" */ + movdqu __iBias(%rax), %xmm6 + subps %xmm2, %xmm7 + +/* c5*r+c4 */ + mulps %xmm7, %xmm3 + paddd %xmm6, %xmm0 + pslld $23, %xmm0 + addps __sPC4(%rax), %xmm3 + +/* (c5*r+c4)*r+c3 */ + mulps %xmm7, %xmm3 + addps __sPC3(%rax), %xmm3 + +/* ((c5*r+c4)*r+c3)*r+c2 */ + mulps %xmm7, %xmm3 + addps __sPC2(%rax), %xmm3 + +/* (((c5*r+c4)*r+c3)*r+c2)*r+c1 */ + mulps %xmm7, %xmm3 + addps __sPC1(%rax), %xmm3 + +/* exp(r) = ((((c5*r+c4)*r+c3)*r+c2)*r+c1)*r+c0 */ + mulps %xmm3, %xmm7 + addps __sPC0(%rax), %xmm7 + +/* 2^N*exp(r) */ + mulps %xmm7, %xmm0 + 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 + movups %xmm5, 192(%rsp) + movups %xmm0, 256(%rsp) + je .LBL_1_2 + + xorb %dl, %dl + xorl %eax, %eax + movups %xmm8, 112(%rsp) + movups %xmm9, 96(%rsp) + movups %xmm10, 80(%rsp) + movups %xmm11, 64(%rsp) + movups %xmm12, 48(%rsp) + movups %xmm13, 32(%rsp) + movups %xmm14, 16(%rsp) + movups %xmm15, (%rsp) + movq %rsi, 136(%rsp) + movq %rdi, 128(%rsp) + movq %r12, 168(%rsp) + cfi_offset_rel_rsp (12, 168) + movb %dl, %r12b + movq %r13, 160(%rsp) + cfi_offset_rel_rsp (13, 160) + movl %ecx, %r13d + movq %r14, 152(%rsp) + cfi_offset_rel_rsp (14, 152) + movl %eax, %r14d + movq %r15, 144(%rsp) + cfi_offset_rel_rsp (15, 144) + 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 + + movups 112(%rsp), %xmm8 + movups 96(%rsp), %xmm9 + movups 80(%rsp), %xmm10 + movups 64(%rsp), %xmm11 + movups 48(%rsp), %xmm12 + movups 32(%rsp), %xmm13 + movups 16(%rsp), %xmm14 + movups (%rsp), %xmm15 + movq 136(%rsp), %rsi + movq 128(%rsp), %rdi + movq 168(%rsp), %r12 + cfi_restore (%r12) + movq 160(%rsp), %r13 + cfi_restore (%r13) + movq 152(%rsp), %r14 + cfi_restore (%r14) + movq 144(%rsp), %r15 + cfi_restore (%r15) + movups 256(%rsp), %xmm0 + jmp .LBL_1_2 + +.LBL_1_10: + cfi_restore_state + movzbl %r12b, %r15d + movss 196(%rsp,%r15,8), %xmm0 + + call JUMPTARGET(__expf_finite) + + movss %xmm0, 260(%rsp,%r15,8) + jmp .LBL_1_8 + +.LBL_1_12: + movzbl %r12b, %r15d + movss 192(%rsp,%r15,8), %xmm0 + + call JUMPTARGET(__expf_finite) + + movss %xmm0, 256(%rsp,%r15,8) + jmp .LBL_1_7 + +END (_ZGVbN4v_expf_sse4) |