--- /dev/null
+/* Optimized memcpy implementation for POWER10.
+ Copyright (C) 2021 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 MEMCPY
+# define MEMCPY memcpy
+#endif
+
+/* __ptr_t [r3] memcpy (__ptr_t dst [r3], __ptr_t src [r4], size_t len [r5]);
+ Returns 'dst'. */
+
+ .machine power9
+ENTRY_TOCLESS (MEMCPY, 5)
+ CALL_MCOUNT 3
+
+ /* Copy up to 16 bytes. */
+ sldi r6,r5,56 /* Prepare [l|st]xvl counter. */
+ lxvl v10,r4,r6
+ stxvl v10,r3,r6
+ subic. r6,r5,16 /* Return if len <= 16. */
+ blelr
+
+ /* If len >= 256, assume nothing got copied before and copy
+ again. This might cause issues with overlapped memory, but memcpy
+ is not expected to treat overlapped memory. */
+ cmpdi r5,256
+ bge L(copy_ge_256)
+ /* 16 < len < 256 and the first 16 bytes have already been copied. */
+ addi r10,r3,16 /* Keep r3 intact as return value. */
+ addi r4,r4,16
+ subi r5,r5,16
+ b L(copy_lt_256) /* Avoid the main loop if len < 256. */
+
+ .p2align 5
+L(copy_ge_256):
+ mr r10,r3 /* Keep r3 intact as return value. */
+ /* Align dst to 16 bytes. */
+ andi. r9,r10,0xf
+ beq L(dst_is_align_16)
+ lxv v10,0(r4)
+ subfic r12,r9,16
+ subf r5,r12,r5
+ add r4,r4,r12
+ stxv v10,0(r3)
+ add r10,r3,r12
+
+L(dst_is_align_16):
+ srdi r9,r5,7 /* Divide by 128. */
+ mtctr r9
+ addi r6,r4,64
+ addi r7,r10,64
+
+
+ /* Main loop, copy 128 bytes per iteration.
+ Use r6=src+64 and r7=dest+64 in order to reduce the dependency on
+ r4 and r10. */
+ .p2align 5
+L(copy_128):
+
+ lxv v10, 0(r4)
+ lxv v11, 16(r4)
+ lxv v12, 32(r4)
+ lxv v13, 48(r4)
+
+ addi r4,r4,128
+
+ stxv v10, 0(r10)
+ stxv v11, 16(r10)
+ stxv v12, 32(r10)
+ stxv v13, 48(r10)
+
+ addi r10,r10,128
+
+ lxv v10, 0(r6)
+ lxv v11, 16(r6)
+ lxv v12, 32(r6)
+ lxv v13, 48(r6)
+
+ addi r6,r6,128
+
+ stxv v10, 0(r7)
+ stxv v11, 16(r7)
+ stxv v12, 32(r7)
+ stxv v13, 48(r7)
+
+ addi r7,r7,128
+
+ bdnz L(copy_128)
+
+ clrldi. r5,r5,64-7 /* Have we copied everything? */
+ beqlr
+
+ .p2align 5
+L(copy_lt_256):
+ cmpdi r5,16
+ ble L(copy_le_16)
+ srdi. r9,r5,5 /* Divide by 32. */
+ beq L(copy_lt_32)
+ mtctr r9
+ /* Use r6=src+32, r7=dest+32, r8=src+64, r9=dest+64 in order to reduce
+ the dependency on r4 and r10. */
+ addi r6,r4,32
+ addi r7,r10,32
+ addi r8,r4,64
+ addi r9,r10,64
+
+ .p2align 5
+ /* Copy 32 bytes at a time, unaligned.
+ The loop is unrolled 3 times in order to reduce the dependency on
+ r4 and r10, copying up-to 96 bytes per iteration. */
+L(copy_32):
+ lxv v10, 0(r4)
+ lxv v11, 16(r4)
+ stxv v10, 0(r10)
+ stxv v11, 16(r10)
+ bdz L(end_copy_32a)
+ addi r4,r4,96
+ addi r10,r10,96
+
+ lxv v10, 0(r6)
+ lxv v11, 16(r6)
+ addi r6,r6,96
+ stxv v10, 0(r7)
+ stxv v11, 16(r7)
+ bdz L(end_copy_32b)
+ addi r7,r7,96
+
+ lxv v12, 0(r8)
+ lxv v13, 16(r8)
+ addi r8,r8,96
+ stxv v12, 0(r9)
+ stxv v13, 16(r9)
+ addi r9,r9,96
+ bdnz L(copy_32)
+
+ clrldi. r5,r5,64-5 /* Have we copied everything? */
+ beqlr
+ cmpdi r5,16
+ ble L(copy_le_16)
+ b L(copy_lt_32)
+
+ .p2align 5
+L(end_copy_32a):
+ clrldi. r5,r5,64-5 /* Have we copied everything? */
+ beqlr
+ /* 32 bytes have been copied since the last update of r4 and r10. */
+ addi r4,r4,32
+ addi r10,r10,32
+ cmpdi r5,16
+ ble L(copy_le_16)
+ b L(copy_lt_32)
+
+ .p2align 5
+L(end_copy_32b):
+ clrldi. r5,r5,64-5 /* Have we copied everything? */
+ beqlr
+ /* The last iteration of the loop copied 64 bytes. Update r4 and r10
+ accordingly. */
+ addi r4,r4,-32
+ addi r10,r10,-32
+ cmpdi r5,16
+ ble L(copy_le_16)
+
+ .p2align 5
+L(copy_lt_32):
+ lxv v10, 0(r4)
+ stxv v10, 0(r10)
+ addi r4,r4,16
+ addi r10,r10,16
+ subi r5,r5,16
+
+ .p2align 5
+L(copy_le_16):
+ sldi r6,r5,56
+ lxvl v10,r4,r6
+ stxvl v10,r10,r6
+ blr
+
+
+END_GEN_TB (MEMCPY,TB_TOCLESS)
+libc_hidden_builtin_def (memcpy)
#ifdef SHARED
/* Support sysdeps/powerpc/powerpc64/multiarch/memcpy.c. */
IFUNC_IMPL (i, name, memcpy,
+#ifdef __LITTLE_ENDIAN__
+ IFUNC_IMPL_ADD (array, i, memcpy,
+ hwcap2 & PPC_FEATURE2_ARCH_3_1
+ && hwcap & PPC_FEATURE_HAS_VSX,
+ __memcpy_power10)
+#endif
IFUNC_IMPL_ADD (array, i, memcpy, hwcap2 & PPC_FEATURE2_ARCH_2_07,
__memcpy_power8_cached)
IFUNC_IMPL_ADD (array, i, memcpy, hwcap & PPC_FEATURE_HAS_VSX,
--- /dev/null
+/* Optimized memcpy implementation for POWER10.
+ Copyright (C) 2021 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
+ <https://www.gnu.org/licenses/>. */
+
+#if defined __LITTLE_ENDIAN__ && IS_IN (libc)
+#define MEMCPY __memcpy_power10
+
+#undef libc_hidden_builtin_def
+#define libc_hidden_builtin_def(name)
+
+#include <sysdeps/powerpc/powerpc64/le/power10/memcpy.S>
+#endif
projects / platform / upstream / glibc.git / commitdiff