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From 7beee7b39adeda657f45989b0635033dae25a1fd Mon Sep 17 00:00:00 2001
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From: Raphael M Zinsly <rzinsly@linux.ibm.com>
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Date: Thu, 12 Nov 2020 13:12:24 -0300
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Subject: powerpc: Add optimized stpncpy for POWER9
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Add stpncpy support into the POWER9 strncpy.
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Reviewed-by: Matheus Castanho <msc@linux.ibm.com>
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Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
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diff --git a/sysdeps/powerpc/powerpc64/le/power9/stpncpy.S b/sysdeps/powerpc/powerpc64/le/power9/stpncpy.S
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new file mode 100644
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index 0000000000..81d9673d8b
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--- /dev/null
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+++ b/sysdeps/powerpc/powerpc64/le/power9/stpncpy.S
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@@ -0,0 +1,24 @@
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+/* Optimized stpncpy implementation for POWER9 LE.
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+ Copyright (C) 2020 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#define USE_AS_STPNCPY
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+#include <sysdeps/powerpc/powerpc64/le/power9/strncpy.S>
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+
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+weak_alias (__stpncpy, stpncpy)
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+libc_hidden_def (__stpncpy)
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+libc_hidden_builtin_def (stpncpy)
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diff --git a/sysdeps/powerpc/powerpc64/le/power9/strncpy.S b/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
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index cbfc37bda3..b4ba428662 100644
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--- a/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
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+++ b/sysdeps/powerpc/powerpc64/le/power9/strncpy.S
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@@ -18,11 +18,19 @@
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#include <sysdep.h>
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+#ifdef USE_AS_STPNCPY
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+# ifndef STPNCPY
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+# define FUNC_NAME __stpncpy
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+# else
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+# define FUNC_NAME STPNCPY
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+# endif
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+#else
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# ifndef STRNCPY
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# define FUNC_NAME strncpy
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# else
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# define FUNC_NAME STRNCPY
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# endif
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+#endif /* !USE_AS_STPNCPY */
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#ifndef MEMSET
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/* For builds without IFUNC support, local calls should be made to internal
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@@ -41,6 +49,12 @@
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char * [r3] strncpy (char *dest [r3], const char *src [r4], size_t n [r5])
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+ or
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+
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+ char * [r3] stpncpy (char *dest [r3], const char *src [r4], size_t n [r5])
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+
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+ if USE_AS_STPNCPY is defined.
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+
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The implementation can load bytes past a null terminator, but only
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up to the next 16-byte aligned address, so it never crosses a page. */
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@@ -66,7 +80,15 @@ ENTRY (FUNC_NAME, 4)
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/* Empty/1-byte string optimization */
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cmpdi r5,0
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+#ifdef USE_AS_STPNCPY
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+ bgt L(cont)
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+ /* Compute pointer to last byte copied into dest. */
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+ addi r3,r3,1
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+ blr
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+L(cont):
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+#else
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beqlr
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+#endif
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addi r4,r4,1
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neg r7,r4
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@@ -96,12 +118,20 @@ ENTRY (FUNC_NAME, 4)
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sldi r10,r5,56 /* stxvl wants size in top 8 bits */
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stxvl 32+v0,r11,r10 /* Partial store */
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+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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+ add r3,r11,r5
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+#endif
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blr
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L(null):
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sldi r10,r8,56 /* stxvl wants size in top 8 bits */
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stxvl 32+v0,r11,r10 /* Partial store */
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+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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+ add r3,r11,r7
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+#endif
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add r11,r11,r8
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sub r5,r5,r8
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b L(zero_padding)
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@@ -185,6 +215,10 @@ L(n_tail4):
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sldi r10,r5,56 /* stxvl wants size in top 8 bits */
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addi r11,r11,48 /* Offset */
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stxvl 32+v3,r11,r10 /* Partial store */
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+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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+ add r3,r11,r5
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+#endif
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blr
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L(prep_n_tail1):
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@@ -196,6 +230,10 @@ L(prep_n_tail1):
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L(n_tail1):
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sldi r10,r5,56 /* stxvl wants size in top 8 bits */
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stxvl 32+v0,r11,r10 /* Partial store */
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+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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+ add r3,r11,r5
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+#endif
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blr
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L(prep_n_tail2):
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@@ -209,6 +247,10 @@ L(n_tail2):
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sldi r10,r5,56 /* stxvl wants size in top 8 bits */
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addi r11,r11,16 /* offset */
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stxvl 32+v1,r11,r10 /* Partial store */
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+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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+ add r3,r11,r5
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+#endif
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blr
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L(prep_n_tail3):
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@@ -223,6 +265,10 @@ L(n_tail3):
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sldi r10,r5,56 /* stxvl wants size in top 8 bits */
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addi r11,r11,32 /* Offset */
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stxvl 32+v2,r11,r10 /* Partial store */
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+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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+ add r3,r11,r5
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+#endif
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blr
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L(prep_tail1):
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@@ -232,6 +278,10 @@ L(tail1):
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addi r9,r8,1 /* Add null terminator */
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sldi r10,r9,56 /* stxvl wants size in top 8 bits */
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stxvl 32+v0,r11,r10 /* Partial store */
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9bb5d6 |
+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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+ add r3,r11,r8
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+#endif
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add r11,r11,r9
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sub r5,r5,r9
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b L(zero_padding)
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@@ -246,6 +296,10 @@ L(tail2):
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9bb5d6 |
sldi r10,r9,56 /* stxvl wants size in top 8 bits */
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9bb5d6 |
addi r11,r11,16 /* offset */
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9bb5d6 |
stxvl 32+v1,r11,r10 /* Partial store */
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9bb5d6 |
+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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9bb5d6 |
+ add r3,r11,r8
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+#endif
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9bb5d6 |
add r11,r11,r9
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9bb5d6 |
sub r5,r5,r9
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b L(zero_padding)
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9bb5d6 |
@@ -261,6 +315,10 @@ L(tail3):
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9bb5d6 |
sldi r10,r9,56 /* stxvl wants size in top 8 bits */
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addi r11,r11,32 /* offset */
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stxvl 32+v2,r11,r10 /* Partial store */
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9bb5d6 |
+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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9bb5d6 |
+ add r3,r11,r8
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9bb5d6 |
+#endif
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9bb5d6 |
add r11,r11,r9
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9bb5d6 |
sub r5,r5,r9
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9bb5d6 |
b L(zero_padding)
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9bb5d6 |
@@ -276,6 +334,10 @@ L(tail4):
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9bb5d6 |
sldi r10,r9,56 /* stxvl wants size in top 8 bits */
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9bb5d6 |
addi r11,r11,48 /* offset */
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9bb5d6 |
stxvl 32+v3,r11,r10 /* Partial store */
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9bb5d6 |
+#ifdef USE_AS_STPNCPY
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+ /* Compute pointer to last byte copied into dest. */
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9bb5d6 |
+ add r3,r11,r8
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9bb5d6 |
+#endif
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9bb5d6 |
add r11,r11,r9
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9bb5d6 |
sub r5,r5,r9
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9bb5d6 |
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9bb5d6 |
@@ -331,7 +393,8 @@ L(zero_padding_memset):
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9bb5d6 |
ld r0,FRAMESIZE+16(r1)
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9bb5d6 |
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9bb5d6 |
mr r3,r30 /* Restore the return value of strncpy, i.e.:
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9bb5d6 |
- dest. */
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9bb5d6 |
+ dest. For stpncpy, the return value is the
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9bb5d6 |
+ same as return value of memset. */
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9bb5d6 |
ld r30,FRAMESIZE-8(r1) /* Restore r30. */
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9bb5d6 |
/* Restore the stack frame. */
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9bb5d6 |
addi r1,r1,FRAMESIZE
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9bb5d6 |
@@ -342,3 +405,6 @@ L(zero_padding_memset):
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9bb5d6 |
blr
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9bb5d6 |
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9bb5d6 |
END (FUNC_NAME)
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9bb5d6 |
+#ifndef USE_AS_STPNCPY
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9bb5d6 |
+libc_hidden_builtin_def (strncpy)
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9bb5d6 |
+#endif
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diff --git a/sysdeps/powerpc/powerpc64/multiarch/Makefile b/sysdeps/powerpc/powerpc64/multiarch/Makefile
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index cd2b47b403..f46bf50732 100644
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9bb5d6 |
--- a/sysdeps/powerpc/powerpc64/multiarch/Makefile
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9bb5d6 |
+++ b/sysdeps/powerpc/powerpc64/multiarch/Makefile
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9bb5d6 |
@@ -33,7 +33,7 @@ sysdep_routines += memcpy-power8-cached memcpy-power7 memcpy-a2 memcpy-power6 \
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9bb5d6 |
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9bb5d6 |
ifneq (,$(filter %le,$(config-machine)))
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9bb5d6 |
sysdep_routines += strcmp-power9 strncmp-power9 strcpy-power9 stpcpy-power9 \
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9bb5d6 |
- rawmemchr-power9 strlen-power9 strncpy-power9
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9bb5d6 |
+ rawmemchr-power9 strlen-power9 strncpy-power9 stpncpy-power9
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9bb5d6 |
endif
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9bb5d6 |
CFLAGS-strncase-power7.c += -mcpu=power7 -funroll-loops
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9bb5d6 |
CFLAGS-strncase_l-power7.c += -mcpu=power7 -funroll-loops
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9bb5d6 |
diff --git a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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9bb5d6 |
index 135326c97a..8e19ebbf09 100644
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9bb5d6 |
--- a/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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9bb5d6 |
+++ b/sysdeps/powerpc/powerpc64/multiarch/ifunc-impl-list.c
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9bb5d6 |
@@ -318,6 +318,12 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array,
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9bb5d6 |
|
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9bb5d6 |
/* Support sysdeps/powerpc/powerpc64/multiarch/stpncpy.c. */
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9bb5d6 |
IFUNC_IMPL (i, name, stpncpy,
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9bb5d6 |
+#ifdef __LITTLE_ENDIAN__
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9bb5d6 |
+ IFUNC_IMPL_ADD (array, i, stpncpy,
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|
|
9bb5d6 |
+ (hwcap2 & PPC_FEATURE2_ARCH_3_00)
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|
|
9bb5d6 |
+ && (hwcap & PPC_FEATURE_HAS_VSX),
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9bb5d6 |
+ __stpncpy_power9)
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9bb5d6 |
+#endif
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|
9bb5d6 |
IFUNC_IMPL_ADD (array, i, stpncpy,
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9bb5d6 |
hwcap2 & PPC_FEATURE2_ARCH_2_07,
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9bb5d6 |
__stpncpy_power8)
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9bb5d6 |
diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power9.S b/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power9.S
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9bb5d6 |
new file mode 100644
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|
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9bb5d6 |
index 0000000000..1188bd0894
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9bb5d6 |
--- /dev/null
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|
9bb5d6 |
+++ b/sysdeps/powerpc/powerpc64/multiarch/stpncpy-power9.S
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9bb5d6 |
@@ -0,0 +1,29 @@
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9bb5d6 |
+/* Optimized stpncpy implementation for POWER9 LE.
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9bb5d6 |
+ Copyright (C) 2020 Free Software Foundation, Inc.
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9bb5d6 |
+ This file is part of the GNU C Library.
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9bb5d6 |
+
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9bb5d6 |
+ The GNU C Library is free software; you can redistribute it and/or
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9bb5d6 |
+ modify it under the terms of the GNU Lesser General Public
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9bb5d6 |
+ License as published by the Free Software Foundation; either
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9bb5d6 |
+ version 2.1 of the License, or (at your option) any later version.
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9bb5d6 |
+
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9bb5d6 |
+ The GNU C Library is distributed in the hope that it will be useful,
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9bb5d6 |
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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9bb5d6 |
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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9bb5d6 |
+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#define STPNCPY __stpncpy_power9
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+
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+#undef libc_hidden_builtin_def
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+#define libc_hidden_builtin_def(name)
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+
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+#define MEMSET __memset_power8
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+#ifdef SHARED
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+# define MEMSET_is_local
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+#endif
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+
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+#include <sysdeps/powerpc/powerpc64/le/power9/stpncpy.S>
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diff --git a/sysdeps/powerpc/powerpc64/multiarch/stpncpy.c b/sysdeps/powerpc/powerpc64/multiarch/stpncpy.c
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index 17df886431..3758f29ad1 100644
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--- a/sysdeps/powerpc/powerpc64/multiarch/stpncpy.c
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+++ b/sysdeps/powerpc/powerpc64/multiarch/stpncpy.c
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@@ -26,10 +26,18 @@
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extern __typeof (__stpncpy) __stpncpy_ppc attribute_hidden;
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extern __typeof (__stpncpy) __stpncpy_power7 attribute_hidden;
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extern __typeof (__stpncpy) __stpncpy_power8 attribute_hidden;
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+# ifdef __LITTLE_ENDIAN__
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+extern __typeof (__stpncpy) __stpncpy_power9 attribute_hidden;
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+# endif
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# undef stpncpy
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# undef __stpncpy
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libc_ifunc_redirected (__redirect___stpncpy, __stpncpy,
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+# ifdef __LITTLE_ENDIAN__
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+ (hwcap2 & PPC_FEATURE2_ARCH_3_00) &&
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+ (hwcap & PPC_FEATURE_HAS_VSX)
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+ ? __stpncpy_power9 :
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+# endif
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(hwcap2 & PPC_FEATURE2_ARCH_2_07)
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? __stpncpy_power8
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: (hwcap & PPC_FEATURE_HAS_VSX)
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