1 files changed, 136 insertions, 0 deletions
diff --git a/ports/sysdeps/powerpc/powerpc32/405/strcmp.S b/ports/sysdeps/powerpc/powerpc32/405/strcmp.S
new file mode 100644
index 0000000000..9cd0e24f24
--- /dev/null
+++ b/ports/sysdeps/powerpc/powerpc32/405/strcmp.S
@@ -0,0 +1,136 @@
+/* Optimized strcmp implementation for PowerPC476.
+   Copyright (C) 2010 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
+   <http://www.gnu.org/licenses/>.  */
+
+#include <sysdep.h>
+#include <bp-sym.h>
+#include <bp-asm.h>
+
+/* strcmp
+
+       Register Use
+       r0:temp return equality
+       r3:source1 address, return equality
+       r4:source2 address
+
+       Implementation description
+       Check 2 words from src1 and src2. If unequal jump to end and
+       return src1 > src2 or src1 < src2.
+       If null check bytes before null and then jump to end and
+       return src1 > src2, src1 < src2 or src1 = src2.
+       If src1 = src2 and no null, repeat. */
+
+EALIGN (BP_SYM(strcmp),5,0)
+       neg     r7,r3
+       clrlwi  r7,r7,20
+       neg     r8,r4
+       clrlwi  r8,r8,20
+       srwi.   r7,r7,5
+       beq     L(byte_loop)
+       srwi.   r8,r8,5
+       beq     L(byte_loop)
+       cmplw   r7,r8
+       mtctr   r7
+       ble     L(big_loop)
+       mtctr   r8
+
+L(big_loop):
+       lwz     r5,0(r3)
+       lwz     r6,4(r3)
+       lwz     r8,0(r4)
+       lwz     r9,4(r4)
+       dlmzb.  r12,r5,r6
+       bne     L(end_check)
+       cmplw   r5,r8
+       bne     L(st1)
+       cmplw   r6,r9
+       bne     L(st1)
+       lwz     r5,8(r3)
+       lwz     r6,12(r3)
+       lwz     r8,8(r4)
+       lwz     r9,12(r4)
+       dlmzb.  r12,r5,r6
+       bne     L(end_check)
+       cmplw   r5,r8
+       bne     L(st1)
+       cmplw   r6,r9
+       bne     L(st1)
+       lwz     r5,16(r3)
+       lwz     r6,20(r3)
+       lwz     r8,16(r4)
+       lwz     r9,20(r4)
+       dlmzb.  r12,r5,r6
+       bne     L(end_check)
+       cmplw   r5,r8
+       bne     L(st1)
+       cmplw   r6,r9
+       bne     L(st1)
+       lwz     r5,24(r3)
+       lwz     r6,28(r3)
+       addi    r3,r3,0x20
+       lwz     r8,24(r4)
+       lwz     r9,28(r4)
+       addi    r4,r4,0x20
+       dlmzb.  r12,r5,r6
+       bne     L(end_check)
+       cmplw   r5,r8
+       bne     L(st1)
+       cmplw   r6,r9
+       bne     L(st1)
+       bdnz    L(big_loop)
+       b       L(byte_loop)
+
+L(end_check):
+       subfic  r12,r12,4
+       blt     L(end_check2)
+       rlwinm  r12,r12,3,0,31
+       srw     r5,r5,r12
+       srw     r8,r8,r12
+       cmplw   r5,r8
+       bne     L(st1)
+       b       L(end_strcmp)
+
+L(end_check2):
+       addi    r12,r12,4
+       cmplw   r5,r8
+       rlwinm  r12,r12,3,0,31
+       bne     L(st1)
+       srw     r6,r6,r12
+       srw     r9,r9,r12
+       cmplw   r6,r9
+       bne     L(st1)
+
+L(end_strcmp):
+       addi    r3,r0,0
+       blr
+
+L(st1):
+       mfcr    r3
+       blr
+
+L(byte_loop):
+       lbz     r5,0(r3)
+       addi    r3,r3,1
+       lbz     r6,0(r4)
+       addi    r4,r4,1
+       cmplw   r5,r6
+       bne     L(st1)
+       cmpwi   r5,0
+       beq     L(end_strcmp)
+       b       L(byte_loop)
+END (BP_SYM (strcmp))
+libc_hidden_builtin_def (strcmp)