diff options
Diffstat (limited to 'sysdeps/x86_64/fpu/multiarch/svml_s_exp2f4_core_sse4.S')
| -rw-r--r-- | sysdeps/x86_64/fpu/multiarch/svml_s_exp2f4_core_sse4.S | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/sysdeps/x86_64/fpu/multiarch/svml_s_exp2f4_core_sse4.S b/sysdeps/x86_64/fpu/multiarch/svml_s_exp2f4_core_sse4.S new file mode 100644 index 0000000000..0d9f45d5c3 --- /dev/null +++ b/sysdeps/x86_64/fpu/multiarch/svml_s_exp2f4_core_sse4.S @@ -0,0 +1,238 @@ +/* Function exp2f vectorized with SSE4. + Copyright (C) 2021 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 + https://www.gnu.org/licenses/. */ + +/* + * ALGORITHM DESCRIPTION: + * + * exp2(x) = 2^n * T[j] * (1 + P(y)) + * where + * x = m*(1/K) + y, y in [-1/K..1/K] + * m = n*K + j, m,n,j - signed integer, j in [-K/2..K/2] + * + * values of 2^j/K are tabulated + * + * P(y) is a minimax polynomial approximation of exp2(x)-1 + * on small interval [-1/K..1/K] + * + * Special cases: + * + * exp2(NaN) = NaN + * exp2(+INF) = +INF + * exp2(-INF) = 0 + * exp2(x) = 1 for subnormals + * For IEEE float + * if x >= 128.0 then exp2f(x) overflow + * if x < -151.0 then exp2f(x) underflow + * + */ + +/* Offsets for data table __svml_sexp2_data_internal + */ +#define _sShifter 0 +#define _sPC0 16 +#define _sPC1 32 +#define _sPC2 48 +#define _sPC3 64 +#define _sPC4 80 +#define _sPC5 96 +#define _sPC6 112 +#define _iAbsMask 128 +#define _iDomainRange 144 + +#include <sysdep.h> + + .text + .section .text.sse4,"ax",@progbits +ENTRY(_ZGVbN4v_exp2f_sse4) + subq $72, %rsp + cfi_def_cfa_offset(80) + +/* Check for overflow\underflow */ + movups __svml_sexp2_data_internal(%rip), %xmm1 + +/* Implementation */ + movaps %xmm1, %xmm5 + +/* Polynomial */ + movups _sPC6+__svml_sexp2_data_internal(%rip), %xmm4 + addps %xmm0, %xmm5 + movaps %xmm5, %xmm3 + +/* 2^N */ + pslld $23, %xmm5 + +/* Check for overflow\underflow */ + movdqu _iAbsMask+__svml_sexp2_data_internal(%rip), %xmm2 + subps %xmm1, %xmm3 + +/* R */ + movaps %xmm0, %xmm1 + pand %xmm0, %xmm2 + pcmpgtd _iDomainRange+__svml_sexp2_data_internal(%rip), %xmm2 + subps %xmm3, %xmm1 + movmskps %xmm2, %edx + mulps %xmm1, %xmm4 + addps _sPC5+__svml_sexp2_data_internal(%rip), %xmm4 + mulps %xmm1, %xmm4 + addps _sPC4+__svml_sexp2_data_internal(%rip), %xmm4 + mulps %xmm1, %xmm4 + addps _sPC3+__svml_sexp2_data_internal(%rip), %xmm4 + mulps %xmm1, %xmm4 + addps _sPC2+__svml_sexp2_data_internal(%rip), %xmm4 + mulps %xmm1, %xmm4 + addps _sPC1+__svml_sexp2_data_internal(%rip), %xmm4 + mulps %xmm4, %xmm1 + addps _sPC0+__svml_sexp2_data_internal(%rip), %xmm1 + +/* Reconstruction */ + paddd %xmm5, %xmm1 + testl %edx, %edx + +/* Go to special inputs processing branch */ + jne L(SPECIAL_VALUES_BRANCH) + # LOE rbx rbp r12 r13 r14 r15 edx xmm0 xmm1 + +/* Restore registers + * and exit the function + */ + +L(EXIT): + movaps %xmm1, %xmm0 + addq $72, %rsp + cfi_def_cfa_offset(8) + ret + cfi_def_cfa_offset(80) + +/* Branch to process + * special inputs + */ + +L(SPECIAL_VALUES_BRANCH): + movups %xmm0, 32(%rsp) + movups %xmm1, 48(%rsp) + # LOE rbx rbp r12 r13 r14 r15 edx + + xorl %eax, %eax + movq %r12, 16(%rsp) + cfi_offset(12, -64) + movl %eax, %r12d + movq %r13, 8(%rsp) + cfi_offset(13, -72) + movl %edx, %r13d + movq %r14, (%rsp) + cfi_offset(14, -80) + # LOE rbx rbp r15 r12d r13d + +/* Range mask + * bits check + */ + +L(RANGEMASK_CHECK): + btl %r12d, %r13d + +/* Call scalar math function */ + jc L(SCALAR_MATH_CALL) + # LOE rbx rbp r15 r12d r13d + +/* Special inputs + * processing loop + */ + +L(SPECIAL_VALUES_LOOP): + incl %r12d + cmpl $4, %r12d + +/* Check bits in range mask */ + jl L(RANGEMASK_CHECK) + # LOE rbx rbp r15 r12d r13d + + movq 16(%rsp), %r12 + cfi_restore(12) + movq 8(%rsp), %r13 + cfi_restore(13) + movq (%rsp), %r14 + cfi_restore(14) + movups 48(%rsp), %xmm1 + +/* Go to exit */ + jmp L(EXIT) + cfi_offset(12, -64) + cfi_offset(13, -72) + cfi_offset(14, -80) + # LOE rbx rbp r12 r13 r14 r15 xmm1 + +/* Scalar math fucntion call + * to process special input + */ + +L(SCALAR_MATH_CALL): + movl %r12d, %r14d + movss 32(%rsp,%r14,4), %xmm0 + call exp2f@PLT + # LOE rbx rbp r14 r15 r12d r13d xmm0 + + movss %xmm0, 48(%rsp,%r14,4) + +/* Process special inputs in loop */ + jmp L(SPECIAL_VALUES_LOOP) + # LOE rbx rbp r15 r12d r13d +END(_ZGVbN4v_exp2f_sse4) + + .section .rodata, "a" + .align 16 + +#ifdef __svml_sexp2_data_internal_typedef +typedef unsigned int VUINT32; +typedef struct +{ + __declspec(align(16)) VUINT32 _sShifter[4][1]; + __declspec(align(16)) VUINT32 _sPC0[4][1]; + __declspec(align(16)) VUINT32 _sPC1[4][1]; + __declspec(align(16)) VUINT32 _sPC2[4][1]; + __declspec(align(16)) VUINT32 _sPC3[4][1]; + __declspec(align(16)) VUINT32 _sPC4[4][1]; + __declspec(align(16)) VUINT32 _sPC5[4][1]; + __declspec(align(16)) VUINT32 _sPC6[4][1]; + __declspec(align(16)) VUINT32 _iAbsMask[4][1]; + __declspec(align(16)) VUINT32 _iDomainRange[4][1]; +} __svml_sexp2_data_internal; +#endif +__svml_sexp2_data_internal: + .long 0x4b400000, 0x4b400000, 0x4b400000, 0x4b400000 /* _sShifter */ + .align 16 + .long 0x3F800000, 0x3F800000, 0x3F800000, 0x3F800000 /* _sPC0 */ + .align 16 + .long 0x3f317218, 0x3f317218, 0x3f317218, 0x3f317218 /* _sPC1 */ + .align 16 + .long 0x3e75fdef, 0x3e75fdef, 0x3e75fdef, 0x3e75fdef /* _sPC2 */ + .align 16 + .long 0x3d6357cf, 0x3d6357cf, 0x3d6357cf, 0x3d6357cf /* _sPC3 */ + .align 16 + .long 0x3c1d962c, 0x3c1d962c, 0x3c1d962c, 0x3c1d962c /* _sPC4 */ + .align 16 + .long 0x3aaf7a51, 0x3aaf7a51, 0x3aaf7a51, 0x3aaf7a51 /* _sPC5 */ + .align 16 + .long 0x39213c8c, 0x39213c8c, 0x39213c8c, 0x39213c8c /* _sPC6 */ + //common + .align 16 + .long 0x7fffffff, 0x7fffffff, 0x7fffffff, 0x7fffffff /* _iAbsMask */ + .align 16 + .long 0x42fc0000, 0x42fc0000, 0x42fc0000, 0x42fc0000 /* _iDomainRange=126.0 */ + .align 16 + .type __svml_sexp2_data_internal,@object + .size __svml_sexp2_data_internal,.-__svml_sexp2_data_internal |