529 lines
12 KiB
ArmAsm
529 lines
12 KiB
ArmAsm
/* Optimized strcasestr implementation for PowerPC64/POWER8.
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Copyright (C) 2016-2022 Free Software Foundation, Inc.
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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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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <locale-defines.h>
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/* Char * [r3] strcasestr (char *s [r3], char * pat[r4]) */
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/* The performance gain is obtained by comparing 16 bytes. */
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/* When the first char of r4 is hit ITERATIONS times in r3
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fallback to default. */
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#define ITERATIONS 64
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#ifndef STRCASESTR
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# define STRCASESTR __strcasestr
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#endif
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#ifndef STRLEN
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/* For builds without IFUNC support, local calls should be made to internal
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GLIBC symbol (created by libc_hidden_builtin_def). */
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# ifdef SHARED
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# define STRLEN __GI_strlen
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# else
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# define STRLEN strlen
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# endif
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#endif
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#ifndef STRNLEN
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/* For builds without IFUNC support, local calls should be made to internal
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GLIBC symbol (created by libc_hidden_builtin_def). */
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# ifdef SHARED
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# define STRNLEN __GI_strnlen
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# else
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# define STRNLEN __strnlen
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# endif
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#endif
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#ifndef STRCHR
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# ifdef SHARED
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# define STRCHR __GI_strchr
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# else
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# define STRCHR strchr
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# endif
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#endif
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/* Convert 16 bytes of v4 and reg to lowercase and compare. */
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#define TOLOWER(reg) \
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vcmpgtub v6, v4, v1; \
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vcmpgtub v7, v2, v4; \
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vand v8, v7, v6; \
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vand v8, v8, v3; \
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vor v4, v8, v4; \
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vcmpgtub v6, reg, v1; \
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vcmpgtub v7, v2, reg; \
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vand v8, v7, v6; \
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vand v8, v8, v3; \
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vor reg, v8, reg; \
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vcmpequb. v6, reg, v4;
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#define FRAMESIZE (FRAME_MIN_SIZE+48)
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.machine power8
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ENTRY (STRCASESTR, 4)
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CALL_MCOUNT 2
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mflr r0 /* Load link register LR to r0. */
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std r31, -8(r1) /* Save callers register r31. */
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std r30, -16(r1) /* Save callers register r30. */
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std r29, -24(r1) /* Save callers register r29. */
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std r28, -32(r1) /* Save callers register r28. */
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std r27, -40(r1) /* Save callers register r27. */
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std r0, 16(r1) /* Store the link register. */
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cfi_offset(r31, -8)
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cfi_offset(r30, -16)
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cfi_offset(r29, -24)
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cfi_offset(r28, -32)
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cfi_offset(r27, -40)
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cfi_offset(lr, 16)
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stdu r1, -FRAMESIZE(r1) /* Create the stack frame. */
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cfi_adjust_cfa_offset(FRAMESIZE)
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dcbt 0, r3
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dcbt 0, r4
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cmpdi cr7, r3, 0 /* Input validation. */
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beq cr7, L(retnull)
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cmpdi cr7, r4, 0
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beq cr7, L(retnull)
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mr r29, r3
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mr r30, r4
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/* Load first byte from r4 and check if its null. */
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lbz r6, 0(r4)
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cmpdi cr7, r6, 0
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beq cr7, L(ret_r3)
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ld r10, __libc_tsd_LOCALE@got@tprel(r2)
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add r9, r10, __libc_tsd_LOCALE@tls
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ld r9, 0(r9)
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ld r9, LOCALE_CTYPE_TOUPPER(r9)
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sldi r10, r6, 2 /* Convert to upper case. */
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lwzx r28, r9, r10
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ld r10, __libc_tsd_LOCALE@got@tprel(r2)
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add r11, r10, __libc_tsd_LOCALE@tls
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ld r11, 0(r11)
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ld r11, LOCALE_CTYPE_TOLOWER(r11)
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sldi r10, r6, 2 /* Convert to lower case. */
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lwzx r27, r11, r10
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/* Check if the first char is present. */
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mr r4, r27
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bl STRCHR
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nop
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mr r5, r3
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mr r3, r29
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mr r29, r5
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mr r4, r28
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bl STRCHR
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nop
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cmpdi cr7, r29, 0
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beq cr7, L(firstpos)
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cmpdi cr7, r3, 0
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beq cr7, L(skipcheck)
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cmpw cr7, r3, r29
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ble cr7, L(firstpos)
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/* Move r3 to the first occurence. */
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L(skipcheck):
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mr r3, r29
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L(firstpos):
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mr r29, r3
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sldi r9, r27, 8
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or r28, r9, r28
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/* Reg r27 is used to count the number of iterations. */
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li r27, 0
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/* If first char of search str is not present. */
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cmpdi cr7, r3, 0
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ble cr7, L(end)
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/* Find the length of pattern. */
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mr r3, r30
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bl STRLEN
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nop
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cmpdi cr7, r3, 0 /* If search str is null. */
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beq cr7, L(ret_r3)
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mr r31, r3
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mr r4, r3
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mr r3, r29
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bl STRNLEN
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nop
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cmpd cr7, r3, r31 /* If len(r3) < len(r4). */
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blt cr7, L(retnull)
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mr r3, r29
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/* Locales not matching ASCII for single bytes. */
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ld r10, __libc_tsd_LOCALE@got@tprel(r2)
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add r9, r10, __libc_tsd_LOCALE@tls
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ld r9, 0(r9)
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ld r7, 0(r9)
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addi r7, r7, LOCALE_DATA_VALUES+_NL_CTYPE_NONASCII_CASE*SIZEOF_VALUES
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lwz r8, 0(r7)
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cmpdi cr7, r8, 1
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beq cr7, L(bytebybyte)
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/* If len(r4) < 16 handle byte by byte. */
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/* For shorter strings we will not use vector registers. */
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cmpdi cr7, r31, 16
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blt cr7, L(bytebybyte)
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/* Comparison values used for TOLOWER. */
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/* Load v1 = 64('A' - 1), v2 = 91('Z' + 1), v3 = 32 in each byte. */
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vspltish v0, 0
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vspltisb v5, 2
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vspltisb v4, 4
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vsl v3, v5, v4
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vaddubm v1, v3, v3
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vspltisb v5, 15
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vaddubm v2, v5, v5
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vaddubm v2, v1, v2
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vspltisb v4, -3
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vaddubm v2, v2, v4
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/*
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1. Load 16 bytes from r3 and r4
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2. Check if there is null, If yes, proceed byte by byte path.
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3. Else,Convert both to lowercase and compare.
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4. If they are same proceed to 1.
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5. If they dont match, find if first char of r4 is present in the
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loaded 16 byte of r3.
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6. If yes, move position, load next 16 bytes of r3 and proceed to 2.
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*/
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mr r8, r3 /* Save r3 for future use. */
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mr r4, r30 /* Restore r4. */
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clrldi r10, r4, 60
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lvx v5, 0, r4 /* Load 16 bytes from r4. */
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cmpdi cr7, r10, 0
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beq cr7, L(begin2)
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/* If r4 is unaligned, load another 16 bytes. */
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#ifdef __LITTLE_ENDIAN__
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lvsr v7, 0, r4
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#else
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lvsl v7, 0, r4
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#endif
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addi r5, r4, 16
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lvx v9, 0, r5
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#ifdef __LITTLE_ENDIAN__
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vperm v5, v9, v5, v7
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#else
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vperm v5, v5, v9, v7
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#endif
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L(begin2):
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lvx v4, 0, r3
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vcmpequb. v7, v0, v4 /* Check for null. */
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beq cr6, L(nullchk6)
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b L(trailcheck)
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.align 4
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L(nullchk6):
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clrldi r10, r3, 60
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cmpdi cr7, r10, 0
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beq cr7, L(next16)
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#ifdef __LITTLE_ENDIAN__
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lvsr v7, 0, r3
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#else
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lvsl v7, 0, r3
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#endif
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addi r5, r3, 16
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/* If r3 is unaligned, load another 16 bytes. */
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lvx v10, 0, r5
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#ifdef __LITTLE_ENDIAN__
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vperm v4, v10, v4, v7
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#else
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vperm v4, v4, v10, v7
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#endif
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L(next16):
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vcmpequb. v6, v0, v5 /* Check for null. */
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beq cr6, L(nullchk)
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b L(trailcheck)
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.align 4
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L(nullchk):
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vcmpequb. v6, v0, v4
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beq cr6, L(nullchk1)
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b L(retnull)
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.align 4
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L(nullchk1):
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/* Convert both v3 and v4 to lower. */
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TOLOWER(v5)
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/* If both are same, branch to match. */
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blt cr6, L(match)
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/* Find if the first char is present in next 15 bytes. */
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#ifdef __LITTLE_ENDIAN__
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vspltb v6, v5, 15
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vsldoi v7, v0, v4, 15
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#else
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vspltb v6, v5, 0
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vspltisb v7, 8
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vslo v7, v4, v7
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#endif
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vcmpequb v7, v6, v7
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vcmpequb. v6, v0, v7
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/* Shift r3 by 16 bytes and proceed. */
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blt cr6, L(shift16)
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vclzd v8, v7
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#ifdef __LITTLE_ENDIAN__
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vspltb v6, v8, 15
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#else
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vspltb v6, v8, 7
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#endif
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vcmpequb. v6, v6, v1
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/* Shift r3 by 8 bytes and proceed. */
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blt cr6, L(shift8)
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b L(begin)
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.align 4
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L(match):
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/* There is a match of 16 bytes, check next bytes. */
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cmpdi cr7, r31, 16
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mr r29, r3
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beq cr7, L(ret_r3)
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L(secondmatch):
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addi r3, r3, 16
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addi r4, r4, 16
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/* Load next 16 bytes of r3 and r4 and compare. */
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clrldi r10, r4, 60
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cmpdi cr7, r10, 0
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beq cr7, L(nextload)
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/* Handle unaligned case. */
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vor v6, v9, v9
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vcmpequb. v7, v0, v6
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beq cr6, L(nullchk2)
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b L(trailcheck)
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.align 4
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L(nullchk2):
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#ifdef __LITTLE_ENDIAN__
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lvsr v7, 0, r4
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#else
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lvsl v7, 0, r4
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#endif
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addi r5, r4, 16
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/* If r4 is unaligned, load another 16 bytes. */
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lvx v9, 0, r5
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#ifdef __LITTLE_ENDIAN__
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vperm v11, v9, v6, v7
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#else
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vperm v11, v6, v9, v7
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#endif
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b L(compare)
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.align 4
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L(nextload):
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lvx v11, 0, r4
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L(compare):
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vcmpequb. v7, v0, v11
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beq cr6, L(nullchk3)
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b L(trailcheck)
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.align 4
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L(nullchk3):
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clrldi r10, r3, 60
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cmpdi cr7, r10, 0
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beq cr7, L(nextload1)
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/* Handle unaligned case. */
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vor v4, v10, v10
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vcmpequb. v7, v0, v4
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beq cr6, L(nullchk4)
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b L(retnull)
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.align 4
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L(nullchk4):
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#ifdef __LITTLE_ENDIAN__
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lvsr v7, 0, r3
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#else
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lvsl v7, 0, r3
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#endif
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addi r5, r3, 16
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/* If r3 is unaligned, load another 16 bytes. */
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lvx v10, 0, r5
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#ifdef __LITTLE_ENDIAN__
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vperm v4, v10, v4, v7
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#else
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vperm v4, v4, v10, v7
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#endif
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b L(compare1)
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.align 4
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L(nextload1):
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lvx v4, 0, r3
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L(compare1):
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vcmpequb. v7, v0, v4
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beq cr6, L(nullchk5)
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b L(retnull)
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.align 4
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L(nullchk5):
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/* Convert both v3 and v4 to lower. */
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TOLOWER(v11)
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/* If both are same, branch to secondmatch. */
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blt cr6, L(secondmatch)
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/* Continue the search. */
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b L(begin)
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.align 4
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L(trailcheck):
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ld r10, __libc_tsd_LOCALE@got@tprel(r2)
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add r11, r10, __libc_tsd_LOCALE@tls
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ld r11, 0(r11)
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ld r11, LOCALE_CTYPE_TOLOWER(r11)
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L(loop2):
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lbz r5, 0(r3) /* Load byte from r3. */
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lbz r6, 0(r4) /* Load next byte from r4. */
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cmpdi cr7, r6, 0 /* Is it null? */
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beq cr7, L(updater3)
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cmpdi cr7, r5, 0 /* Is it null? */
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beq cr7, L(retnull) /* If yes, return. */
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addi r3, r3, 1
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addi r4, r4, 1 /* Increment r4. */
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sldi r10, r5, 2 /* Convert to lower case. */
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lwzx r10, r11, r10
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sldi r7, r6, 2 /* Convert to lower case. */
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lwzx r7, r11, r7
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cmpw cr7, r7, r10 /* Compare with byte from r4. */
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bne cr7, L(begin)
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b L(loop2)
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.align 4
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L(shift8):
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addi r8, r8, 7
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b L(begin)
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.align 4
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L(shift16):
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addi r8, r8, 15
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.align 4
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L(begin):
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addi r8, r8, 1
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mr r3, r8
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/* When our iterations exceed ITERATIONS,fall back to default. */
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addi r27, r27, 1
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cmpdi cr7, r27, ITERATIONS
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beq cr7, L(default)
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mr r4, r30 /* Restore r4. */
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b L(begin2)
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/* Handling byte by byte. */
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.align 4
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L(loop1):
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mr r3, r8
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addi r27, r27, 1
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cmpdi cr7, r27, ITERATIONS
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beq cr7, L(default)
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mr r29, r8
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srdi r4, r28, 8
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/* Check if the first char is present. */
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bl STRCHR
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nop
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mr r5, r3
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mr r3, r29
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mr r29, r5
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sldi r4, r28, 56
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srdi r4, r4, 56
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bl STRCHR
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nop
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cmpdi cr7, r29, 0
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beq cr7, L(nextpos)
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cmpdi cr7, r3, 0
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beq cr7, L(skipcheck1)
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cmpw cr7, r3, r29
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ble cr7, L(nextpos)
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/* Move r3 to first occurence. */
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L(skipcheck1):
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mr r3, r29
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L(nextpos):
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mr r29, r3
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cmpdi cr7, r3, 0
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ble cr7, L(retnull)
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L(bytebybyte):
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ld r10, __libc_tsd_LOCALE@got@tprel(r2)
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add r11, r10, __libc_tsd_LOCALE@tls
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ld r11, 0(r11)
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ld r11, LOCALE_CTYPE_TOLOWER(r11)
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mr r4, r30 /* Restore r4. */
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mr r8, r3 /* Save r3. */
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addi r8, r8, 1
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L(loop):
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addi r3, r3, 1
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lbz r5, 0(r3) /* Load byte from r3. */
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addi r4, r4, 1 /* Increment r4. */
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lbz r6, 0(r4) /* Load next byte from r4. */
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cmpdi cr7, r6, 0 /* Is it null? */
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beq cr7, L(updater3)
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cmpdi cr7, r5, 0 /* Is it null? */
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beq cr7, L(retnull) /* If yes, return. */
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sldi r10, r5, 2 /* Convert to lower case. */
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lwzx r10, r11, r10
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sldi r7, r6, 2 /* Convert to lower case. */
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lwzx r7, r11, r7
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cmpw cr7, r7, r10 /* Compare with byte from r4. */
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bne cr7, L(loop1)
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b L(loop)
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/* Handling return values. */
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.align 4
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L(updater3):
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subf r3, r31, r3 /* Reduce r31 (len of r4) from r3. */
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b L(end)
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.align 4
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L(ret_r3):
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mr r3, r29 /* Return point of match. */
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b L(end)
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|
|
|
.align 4
|
|
L(retnull):
|
|
li r3, 0 /* Substring was not found. */
|
|
b L(end)
|
|
|
|
.align 4
|
|
L(default):
|
|
mr r4, r30
|
|
bl __strcasestr_ppc
|
|
nop
|
|
|
|
.align 4
|
|
L(end):
|
|
addi r1, r1, FRAMESIZE /* Restore stack pointer. */
|
|
cfi_adjust_cfa_offset(-FRAMESIZE)
|
|
ld r0, 16(r1) /* Restore the saved link register. */
|
|
ld r27, -40(r1)
|
|
ld r28, -32(r1)
|
|
ld r29, -24(r1) /* Restore callers save register r29. */
|
|
ld r30, -16(r1) /* Restore callers save register r30. */
|
|
ld r31, -8(r1) /* Restore callers save register r31. */
|
|
cfi_restore(lr)
|
|
cfi_restore(r27)
|
|
cfi_restore(r28)
|
|
cfi_restore(r29)
|
|
cfi_restore(r30)
|
|
cfi_restore(r31)
|
|
mtlr r0 /* Branch to link register. */
|
|
blr
|
|
END (STRCASESTR)
|
|
|
|
weak_alias (__strcasestr, strcasestr)
|
|
libc_hidden_def (__strcasestr)
|
|
libc_hidden_builtin_def (strcasestr)
|