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Added optimized version of memcpy.c to this directory since RTEMS makes

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important distinctions between CPU models which are not made by gcc.
These distinctions help give us a more optimized memcpy().  This is important
for message queues and KA9Q.
This commit is contained in:
Joel Sherrill
1998-06-12 21:12:12 +00:00
parent 9b413eaef6
commit 773890639c
4 changed files with 262 additions and 1 deletions
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2
c/src/exec/score/cpu/m68k/Makefile.in
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@@ -11,7 +11,7 @@ PROJECT_ROOT = @PROJECT_ROOT@
RELS=$(ARCH)/rtems-cpu.rel
# C source names, if any, go here -- minus the .c
C_PIECES=cpu
C_PIECES=cpu memcpy
C_FILES=$(C_PIECES:%=%.c)
C_O_FILES=$(C_PIECES:%=${ARCH}/%.o)

87
c/src/exec/score/cpu/m68k/memcpy.c Normal file
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@@ -0,0 +1,87 @@
/*
* C library memcpy routine
*
* This routine has code to optimize performance on the CPU32+
* and another version for other 68k machines.
*
* It could be optimized more for machines with MOVE16 instructions.
*
* The routine is placed in this source directory to ensure that it
* is picked up by all applications.
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*/
#include <string.h>
#include <rtems/score/m68k.h>
#if defined(__mcpu32__)
#define COPYSETUP(n) n--
#define COPY(to,from,n,size) \
asm volatile ("1:\n" \
"\tmove." size " (%0)+,(%1)+\n" \
"\tdbf %2,1b\n" \
"\tsub.l #0x10000,%2\n" \
"\tbpl.b 1b\n" : \
"=a" (from), "=a" (to), "=d" (n) :\
"0" (from), "1" (to), "2" (n) : \
"cc", "memory")
#else
#define COPYSETUP(n)
#define COPY(to,from,n,size) \
asm volatile ("1:\n" \
"\tmove." size " (%0)+,(%1)+\n" \
"\tsubq.l #1,%2\n\tbne.b 1b\n" : \
"=a" (from), "=a" (to), "=d" (n) :\
"0" (from), "1" (to), "2" (n) : \
"cc", "memory")
#endif
void *
memcpy(void *s1, const void *s2, size_t n)
{
char *p1 = s1;
const char *p2 = s2;
if (n) {
if (n < 16) {
COPYSETUP (n);
COPY (p1, p2, n, "b");
}
else {
int nbyte;
int nl;
nbyte = (int)p1 & 0x3;
if (nbyte) {
nbyte = 4 - nbyte;
n -= nbyte;
COPYSETUP (nbyte);
COPY (p1, p2, nbyte, "b");
}
#if (M68K_HAS_MISALIGNED == 0)
/*
* Take care of machines that can't
* handle misaligned references.
*/
if ((int)p2 & 0x1) {
COPYSETUP (n);
COPY (p1, p2, n, "b");
return s1;
}
#endif
nl = (unsigned int)n >> 2;
COPYSETUP (nl);
COPY (p1, p2, nl, "l");
nbyte = (int)n & 0x3;
if (nbyte) {
COPYSETUP (nbyte);
COPY (p1, p2, nbyte, "b");
}
}
}
return s1;
}

87
c/src/lib/libcpu/m68k/shared/misc/memcpy.c Normal file
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@@ -0,0 +1,87 @@
/*
* C library memcpy routine
*
* This routine has code to optimize performance on the CPU32+
* and another version for other 68k machines.
*
* It could be optimized more for machines with MOVE16 instructions.
*
* The routine is placed in this source directory to ensure that it
* is picked up by all applications.
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*/
#include <string.h>
#include <rtems/score/m68k.h>
#if defined(__mcpu32__)
#define COPYSETUP(n) n--
#define COPY(to,from,n,size) \
asm volatile ("1:\n" \
"\tmove." size " (%0)+,(%1)+\n" \
"\tdbf %2,1b\n" \
"\tsub.l #0x10000,%2\n" \
"\tbpl.b 1b\n" : \
"=a" (from), "=a" (to), "=d" (n) :\
"0" (from), "1" (to), "2" (n) : \
"cc", "memory")
#else
#define COPYSETUP(n)
#define COPY(to,from,n,size) \
asm volatile ("1:\n" \
"\tmove." size " (%0)+,(%1)+\n" \
"\tsubq.l #1,%2\n\tbne.b 1b\n" : \
"=a" (from), "=a" (to), "=d" (n) :\
"0" (from), "1" (to), "2" (n) : \
"cc", "memory")
#endif
void *
memcpy(void *s1, const void *s2, size_t n)
{
char *p1 = s1;
const char *p2 = s2;
if (n) {
if (n < 16) {
COPYSETUP (n);
COPY (p1, p2, n, "b");
}
else {
int nbyte;
int nl;
nbyte = (int)p1 & 0x3;
if (nbyte) {
nbyte = 4 - nbyte;
n -= nbyte;
COPYSETUP (nbyte);
COPY (p1, p2, nbyte, "b");
}
#if (M68K_HAS_MISALIGNED == 0)
/*
* Take care of machines that can't
* handle misaligned references.
*/
if ((int)p2 & 0x1) {
COPYSETUP (n);
COPY (p1, p2, n, "b");
return s1;
}
#endif
nl = (unsigned int)n >> 2;
COPYSETUP (nl);
COPY (p1, p2, nl, "l");
nbyte = (int)n & 0x3;
if (nbyte) {
COPYSETUP (nbyte);
COPY (p1, p2, nbyte, "b");
}
}
}
return s1;
}

87
cpukit/score/cpu/m68k/memcpy.c Normal file
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@@ -0,0 +1,87 @@
/*
* C library memcpy routine
*
* This routine has code to optimize performance on the CPU32+
* and another version for other 68k machines.
*
* It could be optimized more for machines with MOVE16 instructions.
*
* The routine is placed in this source directory to ensure that it
* is picked up by all applications.
*
* W. Eric Norum
* Saskatchewan Accelerator Laboratory
* University of Saskatchewan
* Saskatoon, Saskatchewan, CANADA
* eric@skatter.usask.ca
*/
#include <string.h>
#include <rtems/score/m68k.h>
#if defined(__mcpu32__)
#define COPYSETUP(n) n--
#define COPY(to,from,n,size) \
asm volatile ("1:\n" \
"\tmove." size " (%0)+,(%1)+\n" \
"\tdbf %2,1b\n" \
"\tsub.l #0x10000,%2\n" \
"\tbpl.b 1b\n" : \
"=a" (from), "=a" (to), "=d" (n) :\
"0" (from), "1" (to), "2" (n) : \
"cc", "memory")
#else
#define COPYSETUP(n)
#define COPY(to,from,n,size) \
asm volatile ("1:\n" \
"\tmove." size " (%0)+,(%1)+\n" \
"\tsubq.l #1,%2\n\tbne.b 1b\n" : \
"=a" (from), "=a" (to), "=d" (n) :\
"0" (from), "1" (to), "2" (n) : \
"cc", "memory")
#endif
void *
memcpy(void *s1, const void *s2, size_t n)
{
char *p1 = s1;
const char *p2 = s2;
if (n) {
if (n < 16) {
COPYSETUP (n);
COPY (p1, p2, n, "b");
}
else {
int nbyte;
int nl;
nbyte = (int)p1 & 0x3;
if (nbyte) {
nbyte = 4 - nbyte;
n -= nbyte;
COPYSETUP (nbyte);
COPY (p1, p2, nbyte, "b");
}
#if (M68K_HAS_MISALIGNED == 0)
/*
* Take care of machines that can't
* handle misaligned references.
*/
if ((int)p2 & 0x1) {
COPYSETUP (n);
COPY (p1, p2, n, "b");
return s1;
}
#endif
nl = (unsigned int)n >> 2;
COPYSETUP (nl);
COPY (p1, p2, nl, "l");
nbyte = (int)n & 0x3;
if (nbyte) {
COPYSETUP (nbyte);
COPY (p1, p2, nbyte, "b");
}
}
}
return s1;
}