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418 lines
6.5 KiB
ArmAsm
418 lines
6.5 KiB
ArmAsm
/* Optimized memrchr with sse2
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Copyright (C) 2011-2013 Free Software Foundation, Inc.
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Contributed by Intel Corporation.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef NOT_IN_libc
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# include <sysdep.h>
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# define CFI_PUSH(REG) \
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cfi_adjust_cfa_offset (4); \
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cfi_rel_offset (REG, 0)
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# define CFI_POP(REG) \
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cfi_adjust_cfa_offset (-4); \
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cfi_restore (REG)
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# define PUSH(REG) pushl REG; CFI_PUSH (REG)
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# define POP(REG) popl REG; CFI_POP (REG)
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# define PARMS 4
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# define STR1 PARMS
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# define STR2 STR1+4
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# define LEN STR2+4
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# define MEMCHR __memrchr_sse2_bsf
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.text
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ENTRY (MEMCHR)
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mov STR1(%esp), %ecx
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movd STR2(%esp), %xmm1
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mov LEN(%esp), %edx
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sub $16, %edx
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jbe L(length_less16)
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punpcklbw %xmm1, %xmm1
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add %edx, %ecx
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punpcklbw %xmm1, %xmm1
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movdqu (%ecx), %xmm0
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pshufd $0, %xmm1, %xmm1
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pcmpeqb %xmm1, %xmm0
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/* Check if there is a match. */
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches0)
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sub $64, %ecx
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mov %ecx, %eax
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and $15, %eax
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jz L(loop_prolog)
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add $16, %ecx
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add $16, %edx
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sub %eax, %ecx
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sub %eax, %edx
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.p2align 4
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/* Loop start on aligned string. */
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L(loop_prolog):
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sub $64, %edx
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jbe L(exit_loop)
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movdqa 48(%ecx), %xmm0
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches48)
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movdqa 32(%ecx), %xmm2
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pcmpeqb %xmm1, %xmm2
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pmovmskb %xmm2, %eax
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test %eax, %eax
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jnz L(matches32)
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movdqa 16(%ecx), %xmm3
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pcmpeqb %xmm1, %xmm3
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pmovmskb %xmm3, %eax
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test %eax, %eax
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jnz L(matches16)
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movdqa (%ecx), %xmm4
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pcmpeqb %xmm1, %xmm4
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pmovmskb %xmm4, %eax
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test %eax, %eax
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jnz L(matches0)
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sub $64, %ecx
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sub $64, %edx
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jbe L(exit_loop)
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movdqa 48(%ecx), %xmm0
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches48)
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movdqa 32(%ecx), %xmm2
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pcmpeqb %xmm1, %xmm2
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pmovmskb %xmm2, %eax
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test %eax, %eax
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jnz L(matches32)
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movdqa 16(%ecx), %xmm3
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pcmpeqb %xmm1, %xmm3
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pmovmskb %xmm3, %eax
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test %eax, %eax
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jnz L(matches16)
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movdqa (%ecx), %xmm3
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pcmpeqb %xmm1, %xmm3
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pmovmskb %xmm3, %eax
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test %eax, %eax
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jnz L(matches0)
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mov %ecx, %eax
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and $63, %eax
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test %eax, %eax
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jz L(align64_loop)
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add $64, %ecx
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add $64, %edx
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sub %eax, %ecx
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sub %eax, %edx
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.p2align 4
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L(align64_loop):
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sub $64, %ecx
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sub $64, %edx
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jbe L(exit_loop)
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movdqa (%ecx), %xmm0
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movdqa 16(%ecx), %xmm2
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movdqa 32(%ecx), %xmm3
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movdqa 48(%ecx), %xmm4
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pcmpeqb %xmm1, %xmm0
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pcmpeqb %xmm1, %xmm2
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pcmpeqb %xmm1, %xmm3
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pcmpeqb %xmm1, %xmm4
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pmaxub %xmm3, %xmm0
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pmaxub %xmm4, %xmm2
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pmaxub %xmm0, %xmm2
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pmovmskb %xmm2, %eax
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test %eax, %eax
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jz L(align64_loop)
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pmovmskb %xmm4, %eax
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test %eax, %eax
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jnz L(matches48)
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pmovmskb %xmm3, %eax
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test %eax, %eax
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jnz L(matches32)
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movdqa 16(%ecx), %xmm2
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pcmpeqb %xmm1, %xmm2
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pcmpeqb (%ecx), %xmm1
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pmovmskb %xmm2, %eax
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test %eax, %eax
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jnz L(matches16)
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pmovmskb %xmm1, %eax
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bsr %eax, %eax
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add %ecx, %eax
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ret
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.p2align 4
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L(exit_loop):
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add $64, %edx
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cmp $32, %edx
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jbe L(exit_loop_32)
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movdqa 48(%ecx), %xmm0
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches48)
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movdqa 32(%ecx), %xmm2
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pcmpeqb %xmm1, %xmm2
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pmovmskb %xmm2, %eax
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test %eax, %eax
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jnz L(matches32)
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movdqa 16(%ecx), %xmm3
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pcmpeqb %xmm1, %xmm3
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pmovmskb %xmm3, %eax
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test %eax, %eax
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jnz L(matches16_1)
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cmp $48, %edx
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jbe L(return_null)
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pcmpeqb (%ecx), %xmm1
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pmovmskb %xmm1, %eax
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test %eax, %eax
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jnz L(matches0_1)
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xor %eax, %eax
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ret
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.p2align 4
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L(exit_loop_32):
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movdqa 48(%ecx), %xmm0
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pcmpeqb %xmm1, %xmm0
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pmovmskb %xmm0, %eax
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test %eax, %eax
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jnz L(matches48_1)
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cmp $16, %edx
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jbe L(return_null)
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pcmpeqb 32(%ecx), %xmm1
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pmovmskb %xmm1, %eax
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test %eax, %eax
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jnz L(matches32_1)
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xor %eax, %eax
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ret
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.p2align 4
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L(matches0):
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bsr %eax, %eax
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add %ecx, %eax
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ret
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.p2align 4
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L(matches16):
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bsr %eax, %eax
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lea 16(%eax, %ecx), %eax
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ret
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.p2align 4
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L(matches32):
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bsr %eax, %eax
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lea 32(%eax, %ecx), %eax
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ret
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.p2align 4
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L(matches48):
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bsr %eax, %eax
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lea 48(%eax, %ecx), %eax
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ret
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.p2align 4
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L(matches0_1):
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bsr %eax, %eax
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sub $64, %edx
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add %eax, %edx
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jl L(return_null)
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add %ecx, %eax
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ret
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.p2align 4
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L(matches16_1):
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bsr %eax, %eax
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sub $48, %edx
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add %eax, %edx
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jl L(return_null)
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lea 16(%ecx, %eax), %eax
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ret
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.p2align 4
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L(matches32_1):
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bsr %eax, %eax
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sub $32, %edx
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add %eax, %edx
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jl L(return_null)
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lea 32(%ecx, %eax), %eax
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ret
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.p2align 4
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L(matches48_1):
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bsr %eax, %eax
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sub $16, %edx
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add %eax, %edx
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jl L(return_null)
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lea 48(%ecx, %eax), %eax
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ret
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.p2align 4
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L(return_null):
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xor %eax, %eax
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ret
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.p2align 4
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L(length_less16_offset0):
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mov %dl, %cl
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pcmpeqb (%eax), %xmm1
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mov $1, %edx
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sal %cl, %edx
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sub $1, %edx
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mov %edx, %ecx
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pmovmskb %xmm1, %edx
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and %ecx, %edx
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test %edx, %edx
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jz L(return_null)
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bsr %edx, %ecx
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add %ecx, %eax
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ret
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.p2align 4
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L(length_less16):
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punpcklbw %xmm1, %xmm1
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mov %ecx, %eax
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punpcklbw %xmm1, %xmm1
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add $16, %edx
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jz L(return_null)
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pshufd $0, %xmm1, %xmm1
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and $15, %ecx
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jz L(length_less16_offset0)
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PUSH (%edi)
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mov %cl, %dh
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add %dl, %dh
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and $-16, %eax
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sub $16, %dh
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ja L(length_less16_part2)
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pcmpeqb (%eax), %xmm1
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pmovmskb %xmm1, %edi
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sar %cl, %edi
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add %ecx, %eax
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mov %dl, %cl
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mov $1, %edx
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sal %cl, %edx
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sub $1, %edx
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and %edx, %edi
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test %edi, %edi
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jz L(ret_null)
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bsr %edi, %edi
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add %edi, %eax
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POP (%edi)
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ret
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CFI_PUSH (%edi)
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.p2align 4
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L(length_less16_part2):
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movdqa 16(%eax), %xmm2
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pcmpeqb %xmm1, %xmm2
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pmovmskb %xmm2, %edi
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mov %cl, %ch
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mov %dh, %cl
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mov $1, %edx
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sal %cl, %edx
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sub $1, %edx
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and %edx, %edi
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test %edi, %edi
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jnz L(length_less16_part2_return)
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pcmpeqb (%eax), %xmm1
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pmovmskb %xmm1, %edi
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mov %ch, %cl
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sar %cl, %edi
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test %edi, %edi
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jz L(ret_null)
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bsr %edi, %edi
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add %edi, %eax
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xor %ch, %ch
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add %ecx, %eax
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POP (%edi)
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ret
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CFI_PUSH (%edi)
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.p2align 4
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L(length_less16_part2_return):
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bsr %edi, %edi
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lea 16(%eax, %edi), %eax
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POP (%edi)
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ret
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CFI_PUSH (%edi)
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.p2align 4
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L(ret_null):
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xor %eax, %eax
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POP (%edi)
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ret
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END (MEMCHR)
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#endif
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