diff options
Diffstat (limited to 'sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S b/sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S new file mode 100644 index 0000000000..9530d7b683 --- /dev/null +++ b/sysdeps/x86_64/multiarch/strcat-strlen-evex.h.S @@ -0,0 +1,110 @@ +/* strlen used for begining of str{n}cat using EVEX 256/512. + Copyright (C) 2011-2022 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/>. */ + + +/* NOTE: This file is meant to be included by strcat-evex or + strncat-evex and does not standalone. Before including %rdi + must be saved in %rax. */ + + +/* Simple strlen implementation that ends at + L(strcat_strlen_done). */ + vpxorq %VZERO_128, %VZERO_128, %VZERO_128 + movq %rdi, %r8 + andq $(VEC_SIZE * -1), %r8 + VPCMPEQ (%r8), %VZERO, %k0 + KMOV %k0, %VRCX +#ifdef USE_AS_WCSCPY + subl %r8d, %edi + shrl $2, %edi +#endif + shrx %VRDI, %VRCX, %VRCX +#ifdef USE_AS_WCSCPY + movq %rax, %rdi +#endif + test %VRCX, %VRCX + jnz L(bsf_and_done_v0) + + + VPCMPEQ VEC_SIZE(%r8), %VZERO, %k0 + KMOV %k0, %VRCX + leaq (VEC_SIZE)(%r8), %rdi + test %VRCX, %VRCX + jnz L(bsf_and_done_v0) + + VPCMPEQ (VEC_SIZE * 2)(%r8), %VZERO, %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v1) + + VPCMPEQ (VEC_SIZE * 3)(%r8), %VZERO, %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v2) + + VPCMPEQ (VEC_SIZE * 4)(%r8), %VZERO, %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v3) + + andq $-(VEC_SIZE * 4), %rdi + .p2align 4,, 8 +L(loop_2x_vec): + VMOVA (VEC_SIZE * 4)(%rdi), %VMM(0) + VPMIN (VEC_SIZE * 5)(%rdi), %VMM(0), %VMM(1) + VMOVA (VEC_SIZE * 6)(%rdi), %VMM(2) + VPMIN (VEC_SIZE * 7)(%rdi), %VMM(2), %VMM(3) + VPTESTN %VMM(1), %VMM(1), %k1 + VPTESTN %VMM(3), %VMM(3), %k3 + subq $(VEC_SIZE * -4), %rdi + KORTEST %k1, %k3 + jz L(loop_2x_vec) + + VPTESTN %VMM(0), %VMM(0), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v0) + + KMOV %k1, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v1) + + VPTESTN %VMM(2), %VMM(2), %k0 + KMOV %k0, %VRCX + test %VRCX, %VRCX + jnz L(bsf_and_done_v2) + + KMOV %k3, %VRCX +L(bsf_and_done_v3): + addq $VEC_SIZE, %rdi +L(bsf_and_done_v2): + bsf %VRCX, %VRCX + leaq (VEC_SIZE * 2)(%rdi, %rcx, CHAR_SIZE), %rdi + jmp L(strcat_strlen_done) + + .p2align 4,, 4 +L(bsf_and_done_v1): + addq $VEC_SIZE, %rdi +L(bsf_and_done_v0): + bsf %VRCX, %VRCX +#ifdef USE_AS_WCSCPY + leaq (%rdi, %rcx, CHAR_SIZE), %rdi +#else + addq %rcx, %rdi +#endif +L(strcat_strlen_done): |