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-rw-r--r--sysdeps/powerpc/powerpc64/power8/strncmp.S327
1 files changed, 0 insertions, 327 deletions
diff --git a/sysdeps/powerpc/powerpc64/power8/strncmp.S b/sysdeps/powerpc/powerpc64/power8/strncmp.S
deleted file mode 100644
index 3d8df90538..0000000000
--- a/sysdeps/powerpc/powerpc64/power8/strncmp.S
+++ /dev/null
@@ -1,327 +0,0 @@
-/* Optimized strncmp implementation for PowerPC64/POWER8.
-   Copyright (C) 2015-2017 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>
-
-#ifndef STRNCMP
-# define STRNCMP strncmp
-#endif
-
-/* Implements the function
-
-   int [r3] strncmp (const char *s1 [r3], const char *s2 [r4], size_t [r5] n)
-
-   The implementation uses unaligned doubleword access to avoid specialized
-   code paths depending of data alignment.  Although recent powerpc64 uses
-   64K as default, the page cross handling assumes minimum page size of
-   4k.  */
-
-	.machine  power7
-EALIGN (STRNCMP, 4, 0)
-	/* Check if size is 0.  */
-	mr.	r10,r5
-	beq	cr0,L(ret0)
-
-	/* Check if [s1]+16 or [s2]+16 will cross a 4K page boundary using
-	   the code:
-
-	    (((size_t) s1) % PAGE_SIZE > (PAGE_SIZE - ITER_SIZE))
-
-	   with PAGE_SIZE being 4096 and ITER_SIZE begin 16.  */
-	rldicl	r8,r3,0,52
-	cmpldi	cr7,r8,4096-16
-	bgt	cr7,L(pagecross)
-	rldicl	r9,r4,0,52
-	cmpldi	cr7,r9,4096-16
-	bgt	cr7,L(pagecross)
-
-	/* For short string up to 16 bytes, load both s1 and s2 using
-	   unaligned dwords and compare.  */
-	ld	r7,0(r3)
-	ld	r9,0(r4)
-	li	r8,0
-	cmpb	r8,r7,r8
-	cmpb	r6,r7,r9
-	orc.	r8,r8,r6
-	bne	cr0,L(different1)
-
-	/* If the string compared are equal, but size is less or equal
-	   to 8, return 0.  */
-	cmpldi	cr7,r10,8
-	li	r9,0
-	ble	cr7,L(ret1)
-	addi	r5,r10,-8
-
-	ld	r7,8(r3)
-	ld	r9,8(r4)
-	cmpb	r8,r7,r8
-	cmpb	r6,r7,r9
-	orc.	r8,r8,r6
-	bne	cr0,L(different0)
-
-	cmpldi	cr7,r5,8
-	mr	r9,r8
-	ble	cr7,L(ret1)
-
-	/* Update pointers and size.  */
-	addi	r10,r10,-16
-	addi	r3,r3,16
-	addi	r4,r4,16
-
-	/* Now it has checked for first 16 bytes, align source1 to doubleword
-	   and adjust source2 address.  */
-L(align_8b):
-	rldicl	r5,r3,0,61
-	rldicr	r3,r3,0,60
-	subf	r4,r5,r4
-	add	r10,r10,r5
-
-	/* At this point, source1 alignment is 0 and source2 alignment is
-	   between 0 and 7.  Check is source2 alignment is 0, meaning both
-	   sources have the same alignment.  */
-	andi.	r8,r4,0x7
-	beq	cr0,L(loop_eq_align_0)
-
-	li	r5,0
-	b	L(loop_ne_align_1)
-
-	/* If source2 is unaligned to doubleword, the code needs to check
-	   on each interation if the unaligned doubleword access will cross
-	   a 4k page boundary.  */
-	.align 4
-L(loop_ne_align_0):
-	ld	r7,0(r3)
-	ld	r9,0(r4)
-	cmpb	r8,r7,r5
-	cmpb	r6,r7,r9
-	orc.	r8,r8,r6
-	bne	cr0,L(different1)
-
-	cmpldi	cr7,r10,8
-	ble	cr7,L(ret0)
-	addi	r10,r10,-8
-	addi	r3,r3,8
-	addi	r4,r4,8
-L(loop_ne_align_1):
-	rldicl	r9,r4,0,52
-	cmpldi	r7,r9,4088
-	ble	cr7,L(loop_ne_align_0)
-	cmpdi	cr7,r10,0
-	beq	cr7,L(ret0)
-
-	lbz	r9,0(r3)
-	lbz	r8,0(r4)
-	cmplw	cr7,r9,r8
-	bne	cr7,L(byte_ne_4)
-	cmpdi	cr7,r9,0
-	beq	cr7,L(size_reached_0)
-
-	li	r9,r7
-	addi	r8,r3,1
-	mtctr	r9
-	addi	r4,r4,1
-	addi	r10,r10,-1
-	addi	r3,r3,8
-
-	/* The unaligned read of source2 will cross a 4K page boundary,
-	   and the different byte or NULL maybe be in the remaining page
-	   bytes.  Since it can not use the unaligned load the algorithm
-	   reads and compares 8 bytes to keep source1 doubleword aligned.  */
-	.align 4
-L(loop_ne_align_byte):
-	cmpdi	cr7,r10,0
-	addi	r10,r10,-1
-	beq	cr7,L(ret0)
-	lbz	r9,0(r8)
-	lbz	r7,0(r4)
-	addi	r8,r8,1
-	addi	r4,r4,1
-	cmplw	cr7,r9,r7
-	cmpdi	cr5,r9,0
-	bne	cr7,L(size_reached_2)
-	beq	cr5,L(size_reached_0)
-	bdnz	L(loop_ne_align_byte)
-
-	cmpdi	cr7,r10,0
-	bne+	cr7,L(loop_ne_align_0)
-
-	.align 4
-L(ret0):
-	li	r9,0
-L(ret1):
-	mr	r3,r9
-	blr
-
-	/* The code now check if r8 and r10 are different by issuing a
-	   cmpb and shift the result based on its output:
-
-	#ifdef __LITTLE_ENDIAN__
-	  leadzero = (__builtin_ffsl (z1) - 1);
-	  leadzero = leadzero > (n-1)*8 ? (n-1)*8 : leadzero;
-	  r1 = (r1 >> leadzero) & 0xFFUL;
-	  r2 = (r2 >> leadzero) & 0xFFUL;
-	#else
-	  leadzero = __builtin_clzl (z1);
-	  leadzero = leadzero > (n-1)*8 ? (n-1)*8 : leadzero;
-	  r1 = (r1 >> (56 - leadzero)) & 0xFFUL;
-	  r2 = (r2 >> (56 - leadzero)) & 0xFFUL;
-	#endif
-	  return r1 - r2;  */
-
-	.align 4
-L(different0):
-	mr	r10,r5
-#ifdef __LITTLE_ENDIAN__
-L(different1):
-        neg	r11,r8
-        sldi	r10,r10,3
-        and	r8,r11,r8
-        addi	r10,r10,-8
-        cntlzd	r8,r8
-        subfic	r8,r8,63
-        extsw 	r8,r8
-        cmpld	cr7,r8,r10
-        ble	cr7,L(different2)
-        mr	r8,r10
-L(different2):
-        extsw	r8,r8
-#else
-L(different1):
-	addi	r10,r10,-1
-	cntlzd	r8,r8
-	sldi	r10,r10,3
-	cmpld	cr7,r8,r10
-	blt	cr7,L(different2)
-	mr	r8,r10
-L(different2):
-	subfic	r8,r8,56
-#endif
-	srd	r7,r7,r8
-	srd	r9,r9,r8
-	rldicl	r3,r7,0,56
-	rldicl	r9,r9,0,56
-	subf	r9,r9,3
-	extsw	r9,r9
-	mr	r3,r9
-	blr
-
-	/* If unaligned 16 bytes reads across a 4K page boundary, it uses
-	   a simple byte a byte comparison until the page alignment for s1
-	   is reached.  */
-	.align 4
-L(pagecross):
-	lbz	r7,0(r3)
-	lbz	r9,0(r4)
-	subfic	r8,r8,4095
-	cmplw	cr7,r9,r7
-	bne	cr7,L(byte_ne_3)
-	cmpdi	cr7,r9,0
-	beq	cr7,L(byte_ne_0)
-	addi	r10,r10,-1
-	subf	r7,r8,r10
-	subf	r9,r7,r10
-	addi	r9,r9,1
-	mtctr	r9
-	b	L(pagecross_loop1)
-
-	.align 4
-L(pagecross_loop0):
-	beq	cr7,L(ret0)
-	lbz	r9,0(r3)
-	lbz	r8,0(r4)
-	addi	r10,r10,-1
-	cmplw	cr7,r9,r8
-	cmpdi	cr5,r9,0
-	bne	r7,L(byte_ne_2)
-	beq	r5,L(byte_ne_0)
-L(pagecross_loop1):
-	cmpdi	cr7,r10,0
-	addi	r3,r3,1
-	addi	r4,r4,1
-	bdnz	L(pagecross_loop0)
-	cmpdi	cr7,r7,0
-	li	r9,0
-	bne+	cr7,L(align_8b)
-	b	L(ret1)
-
-	/* If both source1 and source2 are doubleword aligned, there is no
-	   need for page boundary cross checks.  */
-	.align 4
-L(loop_eq_align_0):
-	ld	r7,0(r3)
-	ld	r9,0(r4)
-	cmpb	r8,r7,r8
-	cmpb	r6,r7,r9
-	orc.	r8,r8,r6
-	bne	cr0,L(different1)
-
-	cmpldi	cr7,r10,8
-	ble	cr7,L(ret0)
-	addi	r9,r10,-9
-
-	li	r5,0
-	srdi	r9,r9,3
-	addi	r9,r9,1
-	mtctr	r9
-	b	L(loop_eq_align_2)
-
-	.align 4
-L(loop_eq_align_1):
-	bdz	L(ret0)
-L(loop_eq_align_2):
-	ldu	r7,8(r3)
-	addi	r10,r10,-8
-	ldu	r9,8(r4)
-	cmpb	r8,r7,r5
-	cmpb	r6,r7,r9
-	orc.	r8,r8,r6
-	beq	cr0,L(loop_eq_align_1)
-	b	L(different1)
-
-	.align 4
-L(byte_ne_0):
-	li	r7,0
-L(byte_ne_1):
-	subf	r9,r9,r7
-	extsw	r9,r9
-	b	L(ret1)
-
-	.align 4
-L(byte_ne_2):
-	extsw	r7,r9
-	mr	r9,r8
-	b	L(byte_ne_1)
-L(size_reached_0):
-	li	r10,0
-L(size_reached_1):
-	subf	r9,r9,r10
-	extsw	r9,r9
-	b	L(ret1)
-L(size_reached_2):
-	extsw	r10,r9
-	mr	r9,r7
-	b	L(size_reached_1)
-L(byte_ne_3):
-	extsw	r7,r7
-	b	L(byte_ne_1)
-L(byte_ne_4):
-	extsw	r10,r9
-	mr	r9,r8
-	b	L(size_reached_1)
-END(STRNCMP)
-libc_hidden_builtin_def(strncmp)
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-07-13 20:49:20 +0000