diff options
Diffstat (limited to 'sysdeps/x86_64/fpu/multiarch/svml_s_logf4_core_sse4.S')
| -rw-r--r-- | sysdeps/x86_64/fpu/multiarch/svml_s_logf4_core_sse4.S | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/multiarch/svml_s_logf4_core_sse4.S b/sysdeps/x86_64/fpu/multiarch/svml_s_logf4_core_sse4.S new file mode 100644 index 0000000000..68f11033d9 --- /dev/null +++ b/sysdeps/x86_64/fpu/multiarch/svml_s_logf4_core_sse4.S @@ -0,0 +1,194 @@ +/* Function logf vectorized with SSE4. + Copyright (C) 2014-2015 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_logf_data.h" + + .text +ENTRY (_ZGVbN4v_logf_sse4) +/* + ALGORITHM DESCRIPTION: + + log(x) = exponent_x*log(2) + log(mantissa_x), if mantissa_x<4/3 + log(x) = (exponent_x+1)*log(2) + log(0.5*mantissa_x), if mantissa_x>4/3 + + R = mantissa_x - 1, if mantissa_x<4/3 + R = 0.5*mantissa_x - 1, if mantissa_x>4/3 + |R|< 1/3 + + log(1+R) is approximated as a polynomial: degree 9 for 1-ulp, + degree 7 for 4-ulp, degree 3 for half-precision. */ + + 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 + +/* reduction: compute r,n */ + movaps %xmm0, %xmm2 + +/* check for working range, + set special argument mask (denormals/zero/Inf/NaN) */ + movq __svml_slog_data@GOTPCREL(%rip), %rax + movdqu _iHiDelta(%rax), %xmm1 + movdqu _iLoRange(%rax), %xmm4 + paddd %xmm0, %xmm1 + movdqu _iBrkValue(%rax), %xmm3 + pcmpgtd %xmm1, %xmm4 + movdqu _iOffExpoMask(%rax), %xmm1 + psubd %xmm3, %xmm2 + pand %xmm2, %xmm1 + +/* exponent_x (mantissa_x<4/3) or exponent_x+1 (mantissa_x>4/3) */ + psrad $23, %xmm2 + paddd %xmm3, %xmm1 + movups _sPoly_7(%rax), %xmm5 + +/* mantissa_x (mantissa_x<4/3), or 0.5*mantissa_x (mantissa_x>4/3) */ + cvtdq2ps %xmm2, %xmm6 + +/* reduced argument R */ + subps _sOne(%rax), %xmm1 + movmskps %xmm4, %ecx + +/* final reconstruction: + add exponent_value*log2 to polynomial result */ + mulps _sLn2(%rax), %xmm6 + +/* polynomial evaluation starts here */ + mulps %xmm1, %xmm5 + addps _sPoly_6(%rax), %xmm5 + mulps %xmm1, %xmm5 + addps _sPoly_5(%rax), %xmm5 + mulps %xmm1, %xmm5 + addps _sPoly_4(%rax), %xmm5 + mulps %xmm1, %xmm5 + addps _sPoly_3(%rax), %xmm5 + mulps %xmm1, %xmm5 + addps _sPoly_2(%rax), %xmm5 + mulps %xmm1, %xmm5 + addps _sPoly_1(%rax), %xmm5 + mulps %xmm1, %xmm5 + +/* polynomial evaluation end */ + mulps %xmm1, %xmm5 + addps %xmm5, %xmm1 + addps %xmm6, %xmm1 + testl %ecx, %ecx + jne .LBL_1_3 + +.LBL_1_2: + cfi_remember_state + movdqa %xmm1, %xmm0 + 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 %xmm0, 192(%rsp) + movups %xmm1, 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), %xmm1 + jmp .LBL_1_2 + +.LBL_1_10: + cfi_restore_state + movzbl %r12b, %r15d + movss 196(%rsp,%r15,8), %xmm0 + + call logf@PLT + + movss %xmm0, 260(%rsp,%r15,8) + jmp .LBL_1_8 + +.LBL_1_12: + movzbl %r12b, %r15d + movss 192(%rsp,%r15,8), %xmm0 + + call logf@PLT + + movss %xmm0, 256(%rsp,%r15,8) + jmp .LBL_1_7 + +END (_ZGVbN4v_logf_sse4) |