1 files changed, 130 insertions, 0 deletions
diff --git a/ports/sysdeps/powerpc/powerpc32/405/strncmp.S b/ports/sysdeps/powerpc/powerpc32/405/strncmp.S
new file mode 100644
index 0000000000..af374c9068
--- /dev/null
+++ b/ports/sysdeps/powerpc/powerpc32/405/strncmp.S
@@ -0,0 +1,130 @@
+/* Optimized strncmp 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>
+
+/* strncmp
+
+       Register Use
+       r0:temp return equality
+       r3:source1 address, return equality
+       r4:source2 address
+       r5:byte count
+
+       Implementation description
+       Touch in 3 lines of D-cache.
+       If source1 or source2 is unaligned copy 0-3 bytes to make source1 aligned
+       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 count = zero check bytes before zero counter and then jump to end and
+       return src1 > src2, src1 < src2 or src1 = src2.
+       If src1 = src2 and no null, repeat. */
+
+EALIGN (BP_SYM(strncmp),5,0)
+       neg     r7,r3
+       clrlwi  r7,r7,20
+       neg     r8,r4
+       clrlwi  r8,r8,20
+       srwi.   r7,r7,3
+       beq     L(prebyte_count_loop)
+       srwi.   r8,r8,3
+       beq     L(prebyte_count_loop)
+       cmplw   r7,r8
+       mtctr   r7
+       ble     L(preword2_count_loop)
+       mtctr   r8
+
+L(preword2_count_loop):
+       srwi.   r6,r5,3
+       beq     L(prebyte_count_loop)
+       mfctr   r7
+       cmplw   r6,r7
+       bgt     L(set_count_loop)
+       mtctr   r6
+       clrlwi  r5,r5,29
+
+L(word2_count_loop):
+       lwz     r10,0(r3)
+       lwz     r6,4(r3)
+       addi    r3,r3,0x08
+       lwz     r8,0(r4)
+       lwz     r9,4(r4)
+       addi    r4,r4,0x08
+       dlmzb.  r12,r10,r6
+       bne     L(end_check)
+       cmplw   r10,r8
+       bne     L(st1)
+       cmplw   r6,r9
+       bne     L(st1)
+       bdnz    L(word2_count_loop)
+
+L(prebyte_count_loop):
+       addi    r5,r5,1
+       mtctr   r5
+       bdz     L(end_strncmp)
+
+L(byte_count_loop):
+       lbz     r6,0(r3)
+       addi    r3,r3,1
+       lbz     r7,0(r4)
+       addi    r4,r4,1
+       cmplw   r6,r7
+       bne     L(st1)
+       cmpwi   r6,0
+       beq     L(end_strncmp)
+       bdnz    L(byte_count_loop)
+       b       L(end_strncmp)
+
+L(set_count_loop):
+       slwi    r7,r7,3
+       subf    r5,r7,r5
+       b       L(word2_count_loop)
+
+L(end_check):
+       subfic  r12,r12,4
+       blt     L(end_check2)
+       rlwinm  r12,r12,3,0,31
+       srw     r10,r10,r12
+       srw     r8,r8,r12
+       cmplw   r10,r8
+       bne     L(st1)
+       b       L(end_strncmp)
+
+L(end_check2):
+       addi    r12,r12,4
+       cmplw   r10,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_strncmp):
+       addi    r3,r0,0
+       blr
+
+L(st1):
+       mfcr    r3
+       blr
+END (BP_SYM (strncmp))
+libc_hidden_builtin_def (strncmp)