powerpc: POWER7 optimizations ibm/2.8/master

    Add optimizations for classification functions (32-bit and 64-bit) and
    string functions (32-bit and 64-bit).

    powerpc: Re-work the Implies structure

    This patch tries to organize the implies files for ppc, since there are
    a number of processors and most of them are compatible with each other
    (backwards compatible).

    Having in mind that we start the search for processor-specific files in
    the sysdeps/unix/sysv/linux tree
    (sysdeps/unix/sysv/linux/powerpc/powerpc[32|64]/[processor]/fpu to be
    exact), we would like to grab any linux-specific code from that tree
    prior to going through the other tree (sysdeps/powerpc/...).

    For that, i removed the Implies files that were originally inside the
    fpu directories and placed then in the non-fpu directories (still inside
    the unix/sysv/linux tree). If no processor-specific/linux-specific files
    could be found, we "imply" the other tree's (sysdeps/powerpc/...) fpu
    directory for that specific processor AND also the non-fpu directory for
    that same tree.

    If, again, no processor-specific code is found, we read another Implies
    file that will point to the most compatible processor that we should
    grab code from, and so on, until we reach the power4 processor.

    So, in summary, the Implies files will live inside these directories
    now:

    * sysdeps/unix/sysv/linux/powerpc/powerpc[32|64]/[processor]
    * sysdeps/powerpc/powerpc[32|64]/[processor]

    Practical example of the order we will use to pick power6-specific code
    with the new structure.

    sysdeps/unix/sysv/linux/powerpc/powerpc[32|64]/power6/fpu ->
    sysdeps/unix/sysv/linux/powerpc/powerpc[32|64]/power6 ->
    sysdeps/powerpc/powerpc[32|64]/power6/fpu ->
    sysdeps/powerpc/powerpc[32|64]/power6 ->
    sysdeps/powerpc/powerpc[32|64]/power5+/fpu ->
    sysdeps/powerpc/powerpc[32|64]/power5+ ->
    sysdeps/powerpc/powerpc[32|64]/power5/fpu ->
    sysdeps/powerpc/powerpc[32|64]/power5 ->
    sysdeps/powerpc/powerpc[32|64]/power4/fpu ->
    sysdeps/powerpc/powerpc[32|64]/power4 (from here, it'll go to the
    generic path as usual)

1 files changed, 469 insertions, 0 deletions

diff --git a/sysdeps/powerpc/powerpc32/power7/memcpy.S b/sysdeps/powerpc/powerpc32/power7/memcpy.S
new file mode 100644
index 0000000000..f0c332f1ba
--- /dev/null
+++ b/sysdeps/powerpc/powerpc32/power7/memcpy.S
@@ -0,0 +1,469 @@
+/* Optimized memcpy implementation for PowerPC32/POWER7.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+   Contributed by Luis Machado <luisgpm@br.ibm.com>.
+   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., 51 Franklin Street, Fifth Floor, Boston MA
+   02110-1301 USA.  */
+
+#include <sysdep.h>
+#include <bp-sym.h>
+#include <bp-asm.h>
+
+/* __ptr_t [r3] memcpy (__ptr_t dst [r3], __ptr_t src [r4], size_t len [r5]);
+   Returns 'dst'.  */
+
+	.machine  power7
+EALIGN (BP_SYM (memcpy), 5, 0)
+	CALL_MCOUNT
+
+	stwu    1,-32(1)
+	cfi_adjust_cfa_offset(32)
+	stw	30,20(1)
+	cfi_offset(30,(20-32))
+	stw	31,24(1)
+	mr      30,3
+	cmplwi  cr1,5,31
+	neg	0,3
+	cfi_offset(31,-8)
+	ble	cr1, L(copy_LT_32)  /* If move < 32 bytes use short move
+				    code.  */
+
+	andi.   11,3,7	      /* Check alignment of DST.  */
+	clrlwi  10,4,29	      /* Check alignment of SRC.  */
+	cmplw   cr6,10,11     /* SRC and DST alignments match?  */
+	mr	12,4
+	mr	31,5
+	bne	cr6,L(copy_GE_32_unaligned)
+
+	srwi    9,5,3	      /* Number of full quadwords remaining.  */
+
+	beq	L(copy_GE_32_aligned_cont)
+
+	clrlwi  0,0,29
+	mtcrf   0x01,0
+	subf    31,0,5
+
+	/* Get the SRC aligned to 8 bytes.  */
+
+1:	bf	31,2f
+	lbz	6,0(12)
+	addi    12,12,1
+	stb	6,0(3)
+	addi    3,3,1
+2:	bf      30,4f
+	lhz     6,0(12)
+	addi    12,12,2
+	sth     6,0(3)
+	addi    3,3,2
+4:	bf      29,0f
+	lwz     6,0(12)
+	addi    12,12,4
+	stw     6,0(3)
+	addi    3,3,4
+0:
+	clrlwi  10,12,29      /* Check alignment of SRC again.  */
+	srwi    9,31,3	      /* Number of full doublewords remaining.  */
+
+L(copy_GE_32_aligned_cont):
+
+	clrlwi  11,31,29
+	mtcrf   0x01,9
+
+	srwi    8,31,5
+	cmplwi  cr1,9,4
+	cmplwi  cr6,11,0
+	mr	11,12
+
+	/* Copy 1~3 doublewords so the main loop starts
+	at a multiple of 32 bytes.  */
+
+	bf	30,1f
+	lfd     6,0(12)
+	lfd     7,8(12)
+	addi    11,12,16
+	mtctr   8
+	stfd    6,0(3)
+	stfd    7,8(3)
+	addi    10,3,16
+	bf      31,4f
+	lfd     0,16(12)
+	stfd    0,16(3)
+	blt     cr1,3f
+	addi    11,12,24
+	addi    10,3,24
+	b       4f
+
+	.align  4
+1:	/* Copy 1 doubleword and set the counter.  */
+	mr	10,3
+	mtctr   8
+	bf      31,4f
+	lfd     6,0(12)
+	addi    11,12,8
+	stfd    6,0(3)
+	addi    10,3,8
+
+	.align  4
+4:	/* Main aligned copy loop. Copies 32-bytes at a time.  */
+	lfd	6,0(11)
+	lfd     7,8(11)
+	lfd     8,16(11)
+	lfd     0,24(11)
+	addi    11,11,32
+
+	stfd    6,0(10)
+	stfd    7,8(10)
+	stfd    8,16(10)
+	stfd    0,24(10)
+	addi    10,10,32
+	bdnz    4b
+3:
+
+	/* Check for tail bytes.  */
+
+	clrrwi  0,31,3
+	mtcrf   0x01,31
+	beq	cr6,0f
+
+.L9:
+	add	3,3,0
+	add	12,12,0
+
+	/*  At this point we have a tail of 0-7 bytes and we know that the
+	destination is doubleword-aligned.  */
+4:	/* Copy 4 bytes.  */
+	bf	29,2f
+
+	lwz     6,0(12)
+	addi    12,12,4
+	stw     6,0(3)
+	addi    3,3,4
+2:	/* Copy 2 bytes.  */
+	bf	30,1f
+
+	lhz     6,0(12)
+	addi    12,12,2
+	sth     6,0(3)
+	addi    3,3,2
+1:	/* Copy 1 byte.  */
+	bf	31,0f
+
+	lbz	6,0(12)
+	stb	6,0(3)
+0:	/* Return original DST pointer.  */
+	mr	3,30
+	lwz	30,20(1)
+	lwz     31,24(1)
+	addi    1,1,32
+	blr
+
+	/* Handle copies of 0~31 bytes.  */
+	.align  4
+L(copy_LT_32):
+	cmplwi  cr6,5,8
+	mr	12,4
+	mtcrf   0x01,5
+	ble	cr6,L(copy_LE_8)
+
+	/* At least 9 bytes to go.  */
+	neg	8,4
+	clrrwi  11,4,2
+	andi.   0,8,3
+	cmplwi  cr1,5,16
+	mr	10,5
+	beq	L(copy_LT_32_aligned)
+
+	/* Force 4-bytes alignment for SRC.  */
+	mtocrf  0x01,0
+	subf    10,0,5
+2:	bf	30,1f
+
+	lhz	6,0(12)
+	addi    12,12,2
+	sth	6,0(3)
+	addi    3,3,2
+1:	bf	31,L(end_4bytes_alignment)
+
+	lbz	6,0(12)
+	addi    12,12,1
+	stb	6,0(3)
+	addi    3,3,1
+
+	.align  4
+L(end_4bytes_alignment):
+	cmplwi  cr1,10,16
+	mtcrf   0x01,10
+
+L(copy_LT_32_aligned):
+	/* At least 6 bytes to go, and SRC is word-aligned.  */
+	blt	cr1,8f
+
+	/* Copy 16 bytes.  */
+	lwz	6,0(12)
+	lwz     7,4(12)
+	stw     6,0(3)
+	lwz     8,8(12)
+	stw     7,4(3)
+	lwz     6,12(12)
+	addi    12,12,16
+	stw     8,8(3)
+	stw     6,12(3)
+	addi    3,3,16
+8:	/* Copy 8 bytes.  */
+	bf	28,4f
+
+	lwz     6,0(12)
+	lwz     7,4(12)
+	addi    12,12,8
+	stw     6,0(3)
+	stw     7,4(3)
+	addi    3,3,8
+4:	/* Copy 4 bytes.  */
+	bf	29,2f
+
+	lwz     6,0(12)
+	addi    12,12,4
+	stw     6,0(3)
+	addi    3,3,4
+2:	/* Copy 2-3 bytes.  */
+	bf	30,1f
+
+	lhz     6,0(12)
+	sth     6,0(3)
+	bf      31,0f
+	lbz     7,2(12)
+	stb     7,2(3)
+
+	/* Return original DST pointer.  */
+	mr      3,30
+	lwz     30,20(1)
+	addi    1,1,32
+	blr
+
+	.align  4
+1:	/* Copy 1 byte.  */
+	bf	31,0f
+
+	lbz	6,0(12)
+	stb	6,0(3)
+0:	/* Return original DST pointer.  */
+	mr	3,30
+	lwz	30,20(1)
+	addi    1,1,32
+	blr
+
+	/* Handles copies of 0~8 bytes.  */
+	.align  4
+L(copy_LE_8):
+	bne	cr6,4f
+
+	/* Though we could've used lfd/stfd here, they are still
+	slow for unaligned cases.  */
+
+	lwz	6,0(4)
+	lwz     7,4(4)
+	stw     6,0(3)
+	stw     7,4(3)
+
+	/* Return original DST pointer.  */
+	mr      3,30
+	lwz     30,20(1)
+	addi    1,1,32
+	blr
+
+	.align  4
+4:	/* Copies 4~7 bytes.  */
+	bf	29,2b
+
+	lwz	6,0(4)
+	stw     6,0(3)
+	bf      30,5f
+	lhz     7,4(4)
+	sth     7,4(3)
+	bf      31,0f
+	lbz     8,6(4)
+	stb     8,6(3)
+
+	/* Return original DST pointer.  */
+	mr      3,30
+	lwz     30,20(1)
+	addi    1,1,32
+	blr
+
+	.align  4
+5:	/* Copy 1 byte.  */
+	bf	31,0f
+
+	lbz	6,4(4)
+	stb	6,4(3)
+
+0:	/* Return original DST pointer.  */
+	mr	3,30
+	lwz     30,20(1)
+	addi    1,1,32
+	blr
+
+	/* Handle copies of 32+ bytes where DST is aligned (to quadword) but
+	SRC is not. Use aligned quadword loads from SRC, shifted to realign
+	the data, allowing for aligned DST stores.  */
+	.align  4
+L(copy_GE_32_unaligned):
+	andi.   11,3,15	      /* Check alignment of DST.  */
+	clrlwi  0,0,28	      /* Number of bytes until the 1st
+			      quadword of DST.  */
+	srwi    9,5,4	      /* Number of full quadwords remaining.  */
+
+	beq    L(copy_GE_32_unaligned_cont)
+
+	/* SRC is not quadword aligned, get it aligned.  */
+
+	mtcrf   0x01,0
+	subf    31,0,5
+
+	/* Vector instructions work best when proper alignment (16-bytes)
+	is present.  Move 0~15 bytes as needed to get DST quadword-aligned.  */
+1:	/* Copy 1 byte.  */
+	bf	31,2f
+
+	lbz	6,0(12)
+	addi    12,12,1
+	stb	6,0(3)
+	addi    3,3,1
+2:	/* Copy 2 bytes.  */
+	bf	    30,4f
+
+	lhz     6,0(12)
+	addi    12,12,2
+	sth     6,0(3)
+	addi    3,3,2
+4:	/* Copy 4 bytes.  */
+	bf	29,8f
+
+	lwz     6,0(12)
+	addi    12,12,4
+	stw     6,0(3)
+	addi    3,3,4
+8:	/* Copy 8 bytes.  */
+	bf	28,0f
+
+	lfd	6,0(12)
+	addi    12,12,8
+	stfd    6,0(3)
+	addi    3,3,8
+0:
+	clrlwi  10,12,28      /* Check alignment of SRC.  */
+	srwi    9,31,4	      /* Number of full quadwords remaining.  */
+
+	/* The proper alignment is present, it is OK to copy the bytes now.  */
+L(copy_GE_32_unaligned_cont):
+
+	/* Setup two indexes to speed up the indexed vector operations.  */
+	clrlwi  11,31,28
+	li      6,16	      /* Index for 16-bytes offsets.  */
+	li	7,32	      /* Index for 32-bytes offsets.  */
+	cmplwi  cr1,11,0
+	srwi    8,31,5	      /* Setup the loop counter.  */
+	mr      10,3
+	mr      11,12
+	mtcrf   0x01,9
+	cmplwi  cr6,9,1
+	lvsl    5,0,12
+	lvx     3,0,12
+	bf      31,L(setup_unaligned_loop)
+
+	/* Copy another 16 bytes to align to 32-bytes due to the loop .  */
+	lvx     4,12,6
+	vperm   6,3,4,5
+	addi    11,12,16
+	addi    10,3,16
+	stvx    6,0,3
+	vor	3,4,4
+
+L(setup_unaligned_loop):
+	mtctr   8
+	ble     cr6,L(end_unaligned_loop)
+
+	/* Copy 32 bytes at a time using vector instructions.  */
+	.align  4
+L(unaligned_loop):
+
+	/* Note: vr6/vr10 may contain data that was already copied,
+	but in order to get proper alignment, we may have to copy
+	some portions again. This is faster than having unaligned
+	vector instructions though.  */
+
+	lvx	4,11,6	      /* vr4 = r11+16.  */
+	vperm   6,3,4,5	      /* Merge the correctly-aligned portions
+			      of vr3/vr4 into vr6.  */
+	lvx	3,11,7	      /* vr3 = r11+32.  */
+	vperm   10,4,3,5      /* Merge the correctly-aligned portions
+			      of vr3/vr4 into vr10.  */
+	addi    11,11,32
+	stvx    6,0,10
+	stvx    10,10,6
+	addi    10,10,32
+
+	bdnz    L(unaligned_loop)
+
+	.align  4
+L(end_unaligned_loop):
+
+	/* Check for tail bytes.  */
+	clrrwi  0,31,4
+	mtcrf   0x01,31
+	beq	cr1,0f
+
+	add	3,3,0
+	add	12,12,0
+
+	/*  We have 1~15 tail bytes to copy, and DST is quadword aligned.  */
+8:	/* Copy 8 bytes.  */
+	bf	28,4f
+
+	lwz	6,0(12)
+	lwz	7,4(12)
+	addi    12,12,8
+	stw	6,0(3)
+	stw	7,4(3)
+	addi    3,3,8
+4:	/* Copy 4 bytes.  */
+	bf	29,2f
+
+	lwz	6,0(12)
+	addi    12,12,4
+	stw	6,0(3)
+	addi    3,3,4
+2:	/* Copy 2~3 bytes.  */
+	bf	30,1f
+
+	lhz	6,0(12)
+	addi    12,12,2
+	sth	6,0(3)
+	addi    3,3,2
+1:	/* Copy 1 byte.  */
+	bf	31,0f
+
+	lbz	6,0(12)
+	stb	6,0(3)
+0:	/* Return original DST pointer.  */
+	mr	3,30
+	lwz     30,20(1)
+	lwz	31,24(1)
+	addi    1,1,32
+	blr
+
+END (BP_SYM (memcpy))
+libc_hidden_builtin_def (memcpy)