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[PowerPC64] Port optimized strcpy to PPC64LE

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Submitted by:           Bruno Larsen <bruno.larsen@eldorado.org.br>
Reviewed by:            luporl, bdragon (IRC)
MFC after:              1 week
Sponsored by:           Eldorado Research Institute (eldorado.org.br)
Differential Revision:  https://reviews.freebsd.org/D29067
This commit is contained in:
Leandro Lupori 2021-03-25 13:14:00 -03:00
parent 7595394130
commit 9f50aa45be
2 changed files with 64 additions and 9 deletions
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7
lib/libc/powerpc64/string/Makefile.inc
View File

@ -12,12 +12,7 @@ MDSRCS+= \
memmove_resolver.c \
strncpy_arch_2_05.S \
strncpy.c \
strncpy_resolver.c
# XXX Port strcpy to LE.
.if ${MACHINE_ARCH} == "powerpc64"
MDSRCS+= \
strncpy_resolver.c \
strcpy_arch_2_05.S \
strcpy.c \
strcpy_resolver.c
.endif

66
lib/libc/powerpc64/string/strcpy_arch_2_05.S
View File

@ -26,9 +26,6 @@
* SUCH DAMAGE.
*/
#if !defined(__BIG_ENDIAN__)
#error "Optimized SRTCPY is only supported by big-endian architecture!"
#endif
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
@ -71,6 +68,7 @@ ENTRY(__strcpy_arch_2_05)
beq cr7,.Lcopy_dw_loop
addi %r8,%r8,8 /* Forward r8 to use std instruction. */
#if defined(__BIG_ENDIAN__)
/* Find where the zero is located. */
.Lcheck_zero:
rldicr. %r5,%r0,0,7
@ -136,6 +134,68 @@ ENTRY(__strcpy_arch_2_05)
.Lfound_on_byte_0:
srdi %r6,%r0,56
stb %r6,0(%r8)
#elif defined(__LITTLE_ENDIAN__)
/* Find where the zero is located. */
.Lcheck_zero:
andi. %r7,%r0,0xff
beq .Lfound_on_byte_0
andi. %r7,%r0,0xff00
beq .Lfound_on_byte_1
andis. %r7,%r0,0xff
beq .Lfound_on_byte_2
andis. %r7,%r0,0xff00
beq .Lfound_on_byte_3
rldicr. %r7,%r0,24,7
beq .Lfound_on_byte_4
rldicr. %r7,%r0,16,7
beq .Lfound_on_byte_5
rldicr. %r7,%r0,8,7
beq .Lfound_on_byte_6
/* Copy the last string bytes according to the string end position. */
.Lfound_on_byte_7:
std %r0,0(%r8)
b .Lexit
.Lfound_on_byte_6:
stw %r0,0(%r8)
srdi %r6,%r0,32
sth %r6,4(%r8)
srdi %r6,%r0,48
stb %r6,6(%r8)
b .Lexit
.Lfound_on_byte_5:
stw %r0,0(%r8)
srdi %r6,%r0,32
sth %r6,4(%r8)
b .Lexit
.Lfound_on_byte_4:
stw %r0,0(%r8)
srdi %r6,%r0,32
stb %r6,4(%r8)
b .Lexit
.Lfound_on_byte_3:
stw %r0,0(%r8)
b .Lexit
.Lfound_on_byte_2:
sth %r0,0(%r8)
srdi %r6,%r0,16
stb %r6,2(%r8)
b .Lexit
.Lfound_on_byte_1:
sth %r0,0(%r8)
b .Lexit
.Lfound_on_byte_0:
stb %r0,0(%r8)
#else
#error "Unable to determine Endianness"
#endif
.Lexit:
blr