mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-02 01:40:07 +00:00
2b778ceb40
I used these shell commands: ../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright (cd ../glibc && git commit -am"[this commit message]") and then ignored the output, which consisted lines saying "FOO: warning: copyright statement not found" for each of 6694 files FOO. I then removed trailing white space from benchtests/bench-pthread-locks.c and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this diagnostic from Savannah: remote: *** pre-commit check failed ... remote: *** error: lines with trailing whitespace found remote: error: hook declined to update refs/heads/master
338 lines
7.7 KiB
ArmAsm
338 lines
7.7 KiB
ArmAsm
/* Optimized memrchr implementation for PowerPC64/POWER8.
|
|
Copyright (C) 2017-2021 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, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <sysdep.h>
|
|
|
|
/* int [r3] memrchr (char *s [r3], int byte [r4], int size [r5]) */
|
|
|
|
#ifndef MEMRCHR
|
|
# define MEMRCHR __memrchr
|
|
#endif
|
|
.machine power8
|
|
ENTRY_TOCLESS (MEMRCHR)
|
|
CALL_MCOUNT 3
|
|
add r7, r3, r5 /* Calculate the last acceptable address. */
|
|
neg r0, r7
|
|
addi r7, r7, -1
|
|
mr r10, r3
|
|
clrrdi r6, r7, 7
|
|
li r9, 3<<5
|
|
dcbt r9, r6, 8 /* Stream hint, decreasing addresses. */
|
|
|
|
/* Replicate BYTE to doubleword. */
|
|
insrdi r4, r4, 8, 48
|
|
insrdi r4, r4, 16, 32
|
|
insrdi r4, r4, 32, 0
|
|
li r6, -8
|
|
li r9, -1
|
|
rlwinm r0, r0, 3, 26, 28 /* Calculate padding. */
|
|
clrrdi r8, r7, 3
|
|
srd r9, r9, r0
|
|
cmpldi r5, 32
|
|
clrrdi r0, r10, 3
|
|
ble L(small_range)
|
|
|
|
#ifdef __LITTLE_ENDIAN__
|
|
ldx r12, 0, r8
|
|
#else
|
|
ldbrx r12, 0, r8 /* Load reversed doubleword from memory. */
|
|
#endif
|
|
cmpb r3, r12, r4 /* Check for BYTE in DWORD1. */
|
|
and r3, r3, r9
|
|
cmpldi cr7, r3, 0 /* If r3 == 0, no BYTEs have been found. */
|
|
bne cr7, L(done)
|
|
|
|
/* Are we now aligned to a quadword boundary? If so, skip to
|
|
the main loop. Otherwise, go through the alignment code. */
|
|
andi. r12, r8, 15
|
|
beq cr0, L(align_qw)
|
|
|
|
/* Handle DWORD2 of pair. */
|
|
#ifdef __LITTLE_ENDIAN__
|
|
ldx r12, r8, r6
|
|
#else
|
|
ldbrx r12, r8, r6
|
|
#endif
|
|
addi r8, r8, -8
|
|
cmpb r3, r12, r4
|
|
cmpldi cr7, r3, 0
|
|
bne cr7, L(done)
|
|
|
|
.align 4
|
|
/* At this point, r8 is 16B aligned. */
|
|
L(align_qw):
|
|
sub r5, r8, r0
|
|
vspltisb v0, 0
|
|
/* Precompute vbpermq constant. */
|
|
vspltisb v10, 3
|
|
li r0, 0
|
|
lvsl v11, r0, r0
|
|
vslb v10, v11, v10
|
|
mtvrd v1, r4
|
|
vspltb v1, v1, 7
|
|
cmpldi r5, 64
|
|
ble L(tail64)
|
|
/* Are we 64-byte aligned? If so, jump to the vectorized loop.
|
|
Note: aligning to 64-byte will necessarily slow down performance for
|
|
strings around 64 bytes in length due to the extra comparisons
|
|
required to check alignment for the vectorized loop. This is a
|
|
necessary tradeoff we are willing to take in order to speed up the
|
|
calculation for larger strings. */
|
|
andi. r11, r8, 63
|
|
beq cr0, L(preloop_64B)
|
|
/* In order to begin the 64B loop, it needs to be 64
|
|
bytes aligned. So read until it is 64B aligned. */
|
|
addi r8, r8, -16
|
|
lvx v4, 0, r8
|
|
vcmpequb v6, v1, v4
|
|
vcmpequb. v11, v0, v6
|
|
bnl cr6, L(found_16B)
|
|
addi r5, r5, -16
|
|
|
|
andi. r11, r8, 63
|
|
beq cr0, L(preloop_64B)
|
|
addi r8, r8, -16
|
|
lvx v4, 0, r8
|
|
vcmpequb v6, v1, v4
|
|
vcmpequb. v11, v0, v6
|
|
bnl cr6, L(found_16B)
|
|
addi r5, r5, -16
|
|
|
|
andi. r11, r8, 63
|
|
beq cr0, L(preloop_64B)
|
|
addi r8, r8, -16
|
|
lvx v4, 0, r8
|
|
vcmpequb v6, v1, v4
|
|
vcmpequb. v11, v0, v6
|
|
bnl cr6, L(found_16B)
|
|
addi r5, r5, -16
|
|
/* At this point it should be 64B aligned.
|
|
Prepare for the 64B loop. */
|
|
L(preloop_64B):
|
|
cmpldi r5, 64 /* Check if r5 < 64. */
|
|
ble L(tail64)
|
|
srdi r9, r5, 6 /* Number of loop iterations. */
|
|
mtctr r9 /* Setup the counter. */
|
|
li r11, 16 /* Load required offsets. */
|
|
li r9, 32
|
|
li r7, 48
|
|
|
|
/* Handle r5 > 64. Loop over the bytes in strides of 64B. */
|
|
.align 4
|
|
L(loop):
|
|
addi r8, r8, -64 /* Adjust address for the next iteration. */
|
|
lvx v2, 0, r8 /* Load 4 quadwords. */
|
|
lvx v3, r8, r11
|
|
lvx v4, v8, r9
|
|
lvx v5, v8, r7
|
|
vcmpequb v6, v1, v2
|
|
vcmpequb v7, v1, v3
|
|
vcmpequb v8, v1, v4
|
|
vcmpequb v9, v1, v5
|
|
vor v11, v6, v7
|
|
vor v12, v8, v9
|
|
vor v11, v11, v12 /* Compare and merge into one VR for speed. */
|
|
vcmpequb. v11, v0, v11
|
|
bnl cr6, L(found)
|
|
bdnz L(loop)
|
|
clrldi r5, r5, 58
|
|
|
|
/* Handle remainder of 64B loop or r5 > 64. */
|
|
.align 4
|
|
L(tail64):
|
|
cmpldi r5, 0
|
|
beq L(null)
|
|
addi r8, r8, -16
|
|
lvx v4, 0, r8
|
|
vcmpequb v6, v1, v4
|
|
vcmpequb. v11, v0, v6
|
|
bnl cr6, L(found_16B)
|
|
cmpldi cr6, r5, 16
|
|
ble cr6, L(null)
|
|
addi r5, r5, -16
|
|
|
|
addi r8, r8, -16
|
|
lvx v4, 0, r8
|
|
vcmpequb v6, v1, v4
|
|
vcmpequb. v11, v0, v6
|
|
bnl cr6, L(found_16B)
|
|
cmpldi cr6, r5, 16
|
|
ble cr6, L(null)
|
|
addi r5, r5, -16
|
|
|
|
addi r8, r8, -16
|
|
lvx v4, 0, r8
|
|
vcmpequb v6, v1, v4
|
|
vcmpequb. v11, v0, v6
|
|
bnl cr6, L(found_16B)
|
|
cmpldi cr6, r5, 16
|
|
ble cr6, L(null)
|
|
addi r5, r5, -16
|
|
|
|
addi r8, r8, -16
|
|
lvx v4, 0, r8
|
|
vcmpequb v6, v1, v4
|
|
vcmpequb. v11, v0, v6
|
|
bnl cr6, L(found_16B)
|
|
li r3, 0
|
|
blr
|
|
|
|
/* Found a match in 64B loop. */
|
|
.align 4
|
|
L(found):
|
|
/* Permute the first bit of each byte into bits 48-63. */
|
|
vbpermq v6, v6, v10
|
|
vbpermq v7, v7, v10
|
|
vbpermq v8, v8, v10
|
|
vbpermq v9, v9, v10
|
|
/* Shift each component into its correct position for merging. */
|
|
#ifdef __LITTLE_ENDIAN__
|
|
vsldoi v7, v7, v7, 2
|
|
vsldoi v8, v8, v8, 4
|
|
vsldoi v9, v9, v9, 6
|
|
#else
|
|
vsldoi v6, v6, v6, 6
|
|
vsldoi v7, v7, v7, 4
|
|
vsldoi v8, v8, v8, 2
|
|
#endif
|
|
/* Merge the results and move to a GPR. */
|
|
vor v11, v6, v7
|
|
vor v4, v9, v8
|
|
vor v4, v11, v4
|
|
mfvrd r5, v4
|
|
#ifdef __LITTLE_ENDIAN__
|
|
cntlzd r6, r5 /* Count leading zeros before the match. */
|
|
#else
|
|
addi r6, r5, -1
|
|
andc r6, r6, r5
|
|
popcntd r6, r6
|
|
#endif
|
|
addi r8, r8, 63
|
|
sub r3, r8, r6 /* Compute final address. */
|
|
cmpld cr7, r3, r10
|
|
bgelr cr7
|
|
li r3, 0
|
|
blr
|
|
|
|
/* Found a match in last 16 bytes. */
|
|
.align 4
|
|
L(found_16B):
|
|
cmpld r8, r10 /* Are we on the last QW? */
|
|
bge L(last)
|
|
/* Now discard bytes before starting address. */
|
|
sub r9, r10, r8
|
|
mtvrd v9, r9
|
|
vspltisb v8, 3
|
|
/* Mask unwanted bytes. */
|
|
#ifdef __LITTLE_ENDIAN__
|
|
lvsr v7, 0, r10
|
|
vperm v6, v0, v6, v7
|
|
vsldoi v9, v0, v9, 8
|
|
vsl v9, v9, v8
|
|
vslo v6, v6, v9
|
|
#else
|
|
lvsl v7, 0, r10
|
|
vperm v6, v6, v0, v7
|
|
vsldoi v9, v0, v9, 8
|
|
vsl v9, v9, v8
|
|
vsro v6, v6, v9
|
|
#endif
|
|
L(last):
|
|
/* Permute the first bit of each byte into bits 48-63. */
|
|
vbpermq v6, v6, v10
|
|
/* Shift each component into its correct position for merging. */
|
|
#ifdef __LITTLE_ENDIAN__
|
|
vsldoi v6, v6, v6, 6
|
|
mfvrd r7, v6
|
|
cntlzd r6, r7 /* Count leading zeros before the match. */
|
|
#else
|
|
mfvrd r7, v6
|
|
addi r6, r7, -1
|
|
andc r6, r6, r7
|
|
popcntd r6, r6
|
|
#endif
|
|
addi r8, r8, 15
|
|
sub r3, r8, r6 /* Compute final address. */
|
|
cmpld r6, r5
|
|
bltlr
|
|
li r3, 0
|
|
blr
|
|
|
|
/* r3 has the output of the cmpb instruction, that is, it contains
|
|
0xff in the same position as BYTE in the original
|
|
word from the string. Use that to calculate the pointer.
|
|
We need to make sure BYTE is *before* the end of the
|
|
range. */
|
|
L(done):
|
|
cntlzd r9, r3 /* Count leading zeros before the match. */
|
|
cmpld r8, r0 /* Are we on the last word? */
|
|
srdi r6, r9, 3 /* Convert leading zeros to bytes. */
|
|
addi r0, r6, -7
|
|
sub r3, r8, r0
|
|
cmpld cr7, r3, r10
|
|
bnelr
|
|
bgelr cr7
|
|
li r3, 0
|
|
blr
|
|
|
|
.align 4
|
|
L(null):
|
|
li r3, 0
|
|
blr
|
|
|
|
/* Deals with size <= 32. */
|
|
.align 4
|
|
L(small_range):
|
|
cmpldi r5, 0
|
|
beq L(null)
|
|
|
|
#ifdef __LITTLE_ENDIAN__
|
|
ldx r12, 0, r8
|
|
#else
|
|
ldbrx r12, 0, r8 /* Load reversed doubleword from memory. */
|
|
#endif
|
|
cmpb r3, r12, r4 /* Check for BYTE in DWORD1. */
|
|
and r3, r3, r9
|
|
cmpldi cr7, r3, 0
|
|
bne cr7, L(done)
|
|
|
|
/* Are we done already? */
|
|
cmpld r8, r0
|
|
addi r8, r8, -8
|
|
beqlr
|
|
|
|
.align 5
|
|
L(loop_small):
|
|
#ifdef __LITTLE_ENDIAN__
|
|
ldx r12, 0, r8
|
|
#else
|
|
ldbrx r12, 0, r8
|
|
#endif
|
|
cmpb r3, r12, r4
|
|
cmpld r8, r0
|
|
cmpldi cr7, r3, 0
|
|
bne cr7, L(done)
|
|
addi r8, r8, -8
|
|
bne L(loop_small)
|
|
blr
|
|
|
|
END (MEMRCHR)
|
|
weak_alias (__memrchr, memrchr)
|
|
libc_hidden_builtin_def (memrchr)
|