diff options
author | Mike Frysinger <vapier@gentoo.org> | 2007-09-15 11:04:21 +0000 |
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committer | Mike Frysinger <vapier@gentoo.org> | 2007-09-15 11:04:21 +0000 |
commit | 7efe92d0cadd12d3316939474f56a3f6e727a0b0 (patch) | |
tree | 1091149e7e94e1de15889d40637d5d3ca1add2f5 /libc/string/bfin/memcmp.S | |
parent | 953e7478a36597f227aeb487c97c03005a4a5f71 (diff) |
pull from Blackfin repo: cleanup string funcs
Diffstat (limited to 'libc/string/bfin/memcmp.S')
-rw-r--r-- | libc/string/bfin/memcmp.S | 94 |
1 files changed, 47 insertions, 47 deletions
diff --git a/libc/string/bfin/memcmp.S b/libc/string/bfin/memcmp.S index 117550cdb..b5d4f1c7a 100644 --- a/libc/string/bfin/memcmp.S +++ b/libc/string/bfin/memcmp.S @@ -1,5 +1,5 @@ /* memcmp.S - * Copyright (C) 2003, 2005, 2006 Analog Devices Inc., All Rights Reserved. + * Copyright (C) 2003-2007 Analog Devices Inc., All Rights Reserved. * * This file is subject to the terms and conditions of the GNU Library General * Public License. See the file "COPYING.LIB" in the main directory of this @@ -9,6 +9,8 @@ * http://www.analog.com/processors/resources/crosscore/visualDspDevSoftware.html */ +#include <sysdep.h> + /* int memcmp(const void *s1, const void *s2, size_t n); * R0 = First Address (s1) * R1 = Second Address (s2) @@ -17,34 +19,30 @@ * Favours word aligned data. */ -#include <features.h> - .text .align 2 -.global _memcmp -.type _memcmp, STT_FUNC -_memcmp: +ENTRY(_memcmp) I1 = P3; - P0 = R0; // P0 = s1 address - P3 = R1; // P3 = s2 Address - P2 = R2 ; // P2 = count + P0 = R0; /* P0 = s1 address */ + P3 = R1; /* P3 = s2 Address */ + P2 = R2 ; /* P2 = count */ CC = R2 <= 7(IU); - IF CC JUMP too_small; - I0 = R1; // s2 - R1 = R1 | R0; // OR addresses together - R1 <<= 30; // check bottom two bits - CC = AZ; // AZ set if zero. - IF !CC JUMP bytes ; // Jump if addrs not aligned. + IF CC JUMP .Ltoo_small; + I0 = R1; /* s2 */ + R1 = R1 | R0; /* OR addresses together */ + R1 <<= 30; /* check bottom two bits */ + CC = AZ; /* AZ set if zero. */ + IF !CC JUMP .Lbytes ; /* Jump if addrs not aligned. */ - P1 = P2 >> 2; // count = n/4 + P1 = P2 >> 2; /* count = n/4 */ R3 = 3; - R2 = R2 & R3; // remainder - P2 = R2; // set remainder + R2 = R2 & R3; /* remainder */ + P2 = R2; /* set remainder */ - LSETUP (quad_loop_s , quad_loop_e) LC0=P1; -quad_loop_s: + LSETUP (.Lquad_loop_s, .Lquad_loop_e) LC0=P1; +.Lquad_loop_s: #if !defined(__WORKAROUND_AVOID_DAG1) MNOP || R0 = [P0++] || R1 = [I0++]; #else @@ -52,48 +50,50 @@ quad_loop_s: R1 = [I0++]; #endif CC = R0 == R1; - IF !CC JUMP quad_different; -quad_loop_e: + IF !CC JUMP .Lquad_different; +.Lquad_loop_e: NOP; - P3 = I0; // s2 -too_small: - CC = P2 == 0; //Check zero count - IF CC JUMP finished; // very unlikely + P3 = I0; /* s2 */ +.Ltoo_small: + CC = P2 == 0; /* Check zero count*/ + IF CC JUMP .Lfinished; /* very unlikely*/ -bytes: - LSETUP (byte_loop_s , byte_loop_e) LC0=P2; -byte_loop_s: - R1 = B[P3++](Z); // *s2 - R0 = B[P0++](Z); // *s1 +.Lbytes: + LSETUP (.Lbyte_loop_s, .Lbyte_loop_e) LC0=P2; +.Lbyte_loop_s: + R1 = B[P3++](Z); /* *s2 */ + R0 = B[P0++](Z); /* *s1 */ CC = R0 == R1; - IF !CC JUMP different; -byte_loop_e: + IF !CC JUMP .Ldifferent; +.Lbyte_loop_e: NOP; -different: +.Ldifferent: R0 = R0 - R1; P3 = I1; RTS; -quad_different: - // We've read two quads which don't match. - // Can't just compare them, because we're - // a little-endian machine, so the MSBs of - // the regs occur at later addresses in the - // string. - // Arrange to re-read those two quads again, - // byte-by-byte. - P0 += -4; // back up to the start of the - P3 = I0; // quads, and increase the - P2 += 4; // remainder count +.Lquad_different: + /* We've read two quads which don't match. + * Can't just compare them, because we're + * a little-endian machine, so the MSBs of + * the regs occur at later addresses in the + * string. + * Arrange to re-read those two quads again, + * byte-by-byte. + */ + P0 += -4; /* back up to the start of the */ + P3 = I0; /* quads, and increase the*/ + P2 += 4; /* remainder count*/ P3 += -4; - JUMP bytes; + JUMP .Lbytes; -finished: +.Lfinished: R0 = 0; P3 = I1; RTS; + .size _memcmp,.-_memcmp libc_hidden_def (memcmp) |