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Diffstat (limited to 'sysdeps/i386/i686/multiarch/wcslen-sse2.S')
-rw-r--r--sysdeps/i386/i686/multiarch/wcslen-sse2.S194
1 files changed, 194 insertions, 0 deletions
diff --git a/sysdeps/i386/i686/multiarch/wcslen-sse2.S b/sysdeps/i386/i686/multiarch/wcslen-sse2.S
new file mode 100644
index 0000000000..d41d623098
--- /dev/null
+++ b/sysdeps/i386/i686/multiarch/wcslen-sse2.S
@@ -0,0 +1,194 @@
+/* wcslen with SSE2
+ Copyright (C) 2011 Free Software Foundation, Inc.
+ Contributed by Intel Corporation.
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef NOT_IN_libc
+# include <sysdep.h>
+# define STR 4
+
+ .text
+ENTRY (__wcslen_sse2)
+ mov STR(%esp), %edx
+
+ cmp $0, (%edx)
+ jz L(exit_tail0)
+ cmp $0, 4(%edx)
+ jz L(exit_tail1)
+ cmp $0, 8(%edx)
+ jz L(exit_tail2)
+ cmp $0, 12(%edx)
+ jz L(exit_tail3)
+ cmp $0, 16(%edx)
+ jz L(exit_tail4)
+ cmp $0, 20(%edx)
+ jz L(exit_tail5)
+ cmp $0, 24(%edx)
+ jz L(exit_tail6)
+ cmp $0, 28(%edx)
+ jz L(exit_tail7)
+
+ pxor %xmm0, %xmm0
+
+ lea 32(%edx), %eax
+ lea 16(%edx), %ecx
+ and $-16, %eax
+
+ pcmpeqd (%eax), %xmm0
+ pmovmskb %xmm0, %edx
+ pxor %xmm1, %xmm1
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqd (%eax), %xmm1
+ pmovmskb %xmm1, %edx
+ pxor %xmm2, %xmm2
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqd (%eax), %xmm2
+ pmovmskb %xmm2, %edx
+ pxor %xmm3, %xmm3
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ pcmpeqd (%eax), %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea 16(%eax), %eax
+ jnz L(exit)
+
+ and $-0x40, %eax
+
+ .p2align 4
+L(aligned_64_loop):
+ movaps (%eax), %xmm0
+ movaps 16(%eax), %xmm1
+ movaps 32(%eax), %xmm2
+ movaps 48(%eax), %xmm6
+
+ pminub %xmm1, %xmm0
+ pminub %xmm6, %xmm2
+ pminub %xmm0, %xmm2
+ pcmpeqd %xmm3, %xmm2
+ pmovmskb %xmm2, %edx
+ test %edx, %edx
+ lea 64(%eax), %eax
+ jz L(aligned_64_loop)
+
+ pcmpeqd -64(%eax), %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea 48(%ecx), %ecx
+ jnz L(exit)
+
+ pcmpeqd %xmm1, %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea -16(%ecx), %ecx
+ jnz L(exit)
+
+ pcmpeqd -32(%eax), %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea -16(%ecx), %ecx
+ jnz L(exit)
+
+ pcmpeqd %xmm6, %xmm3
+ pmovmskb %xmm3, %edx
+ test %edx, %edx
+ lea -16(%ecx), %ecx
+ jnz L(exit)
+
+ jmp L(aligned_64_loop)
+
+ .p2align 4
+L(exit):
+ sub %ecx, %eax
+ shr $2, %eax
+ test %dl, %dl
+ jz L(exit_high)
+
+ mov %dl, %cl
+ and $15, %cl
+ jz L(exit_1)
+ ret
+
+ .p2align 4
+L(exit_high):
+ mov %dh, %ch
+ and $15, %ch
+ jz L(exit_3)
+ add $2, %eax
+ ret
+
+ .p2align 4
+L(exit_1):
+ add $1, %eax
+ ret
+
+ .p2align 4
+L(exit_3):
+ add $3, %eax
+ ret
+
+ .p2align 4
+L(exit_tail0):
+ xor %eax, %eax
+ ret
+
+ .p2align 4
+L(exit_tail1):
+ mov $1, %eax
+ ret
+
+ .p2align 4
+L(exit_tail2):
+ mov $2, %eax
+ ret
+
+ .p2align 4
+L(exit_tail3):
+ mov $3, %eax
+ ret
+
+ .p2align 4
+L(exit_tail4):
+ mov $4, %eax
+ ret
+
+ .p2align 4
+L(exit_tail5):
+ mov $5, %eax
+ ret
+
+ .p2align 4
+L(exit_tail6):
+ mov $6, %eax
+ ret
+
+ .p2align 4
+L(exit_tail7):
+ mov $7, %eax
+ ret
+
+END (__wcslen_sse2)
+#endif