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Performance tweaks

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This commit is contained in:
Michael Meissner 1995-10-12 21:49:37 +00:00
parent 8e20a3ac82
commit a8958dd48b
3 changed files with 79 additions and 11 deletions
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15
sim/ppc/ChangeLog
View File

@ -1,5 +1,20 @@
Thu Oct 12 11:35:53 1995 Michael Meissner <meissner@tiktok.cygnus.com>
* ppc-endian.c (SWAP_n): New macros to speed up byte swapping for
2, 4, and 8 bytes.
(ENDIAN_N): If both target and host byte orders are known, don't
bother testing CURRENT_{TARGET,HOST}_BYTE_ORDER.
* ppc-endian.h (target specific H2T_n/T2H_n macros): Remove #if 0
to allow target specific H2T_n/T2H_n macros to be used.
(htonl, ntohl): If compiled on a 486 by GCC and WITH_BSWAP is
non-zero, redefine the htonl/ntohl macros to use the BSWAP instead
of the 3 instruction sequence that runs on 386s.
* std-config.h (WITH_{HOST,TARGET}_BYTE_ORDER): Don't override if
specified on the compile line.
(WITH_BSWAP): If not defined, define as 0.
* Makefile.in (INLINE_CFLAGS): Add -DDEFAULT_INLINE=2 to add
default inline support. Pass INLINE_CFLAGS when compiling.

66
sim/ppc/ppc-endian.c
View File

@ -41,6 +41,61 @@ typedef union {
unsigned_8 val_8[1];
} endian_map;
#define SWAP_N(RAW,BYTE_SIZE) \
endian_map in; \
endian_map out; \
int byte_nr; \
in.val_##BYTE_SIZE[0] = RAW; \
for (byte_nr = 0; byte_nr < BYTE_SIZE; byte_nr++) { \
out.val_1[BYTE_SIZE-1-byte_nr] = in.val_1[byte_nr]; \
} \
return out.val_##BYTE_SIZE[0]; \
#if (WITH_HOST_BYTE_ORDER == LITTLE_ENDIAN) && WITH_NTOH
#define SWAP_2(RAW) return htons (RAW)
#endif
#ifndef SWAP_2
#define SWAP_2(RAW) return (((RAW) >> 8) | ((RAW) << 8))
#endif
#if !defined(SWAP_4) && (WITH_HOST_BYTE_ORDER == LITTLE_ENDIAN) && WITH_NTOH
#define SWAP_4(RAW) return htonl (RAW)
#endif
#ifndef SWAP_4
#define SWAP_4(RAW) return (((RAW) << 24) | (((RAW) & 0xff00) << 8) | (((RAW) & 0xff0000) >> 8) | ((RAW) >> 24))
#endif
#ifndef SWAP_8
#define SWAP_8(RAW) SWAP_N(RAW,4)
#endif
/* no need to swap */
#if (WITH_HOST_BYTE_ORDER \
&& WITH_TARGET_BYTE_ORDER \
&& WITH_HOST_BYTE_ORDER == WITH_TARGET_BYTE_ORDER )
#define ENDIAN_N(NAME,BYTE_SIZE) \
unsigned_##BYTE_SIZE \
endian_##NAME##_##BYTE_SIZE(unsigned_##BYTE_SIZE raw_in) \
{ \
return raw_in; \
}
#endif
/* always need to swap */
#if (WITH_HOST_BYTE_ORDER \
&& WITH_TARGET_BYTE_ORDER \
&& WITH_HOST_BYTE_ORDER != WITH_TARGET_BYTE_ORDER )
#define ENDIAN_N(NAME,BYTE_SIZE) \
unsigned_##BYTE_SIZE \
endian_##NAME##_##BYTE_SIZE(unsigned_##BYTE_SIZE raw_in) \
{ \
SWAP_##BYTE_SIZE(raw_in); \
}
#endif
#ifndef ENDIAN_N
#define ENDIAN_N(NAME,BYTE_SIZE) \
unsigned_##BYTE_SIZE \
endian_##NAME##_##BYTE_SIZE(unsigned_##BYTE_SIZE raw_in) \
@ -49,17 +104,10 @@ endian_##NAME##_##BYTE_SIZE(unsigned_##BYTE_SIZE raw_in) \
return raw_in; \
} \
else { \
endian_map in; \
endian_map out; \
int byte_nr; \
in.val_##BYTE_SIZE[0] = raw_in; \
for (byte_nr = 0; byte_nr < BYTE_SIZE; byte_nr++) { \
out.val_1[BYTE_SIZE-1-byte_nr] = in.val_1[byte_nr]; \
} \
return out.val_##BYTE_SIZE[0]; \
SWAP_##BYTE_SIZE(raw_in); \
} \
}
#endif
ENDIAN_N(h2t, 2)
ENDIAN_N(h2t, 4)

9
sim/ppc/ppc-endian.h
View File

@ -199,7 +199,6 @@ do { \
Returns the value swapped according to the host/target byte order */
/* no need to swap */
#if 0
#if (WITH_HOST_BYTE_ORDER \
&& WITH_TARGET_BYTE_ORDER \
&& WITH_HOST_BYTE_ORDER == WITH_TARGET_BYTE_ORDER )
@ -227,6 +226,13 @@ do { \
#define T2H_1(X) (X)
#endif
#if (defined (__i486__) || defined (__i586__)) && defined(__GNUC__) && WITH_BSWAP && WITH_NTOH
#undef htonl
#undef ntohl
#define htonl(IN) __extension__ ({ int _out; __asm__ ("bswap %0" : "=r" (_out) : "0" (IN)); _out; })
#define ntohl(IN) __extension__ ({ int _out; __asm__ ("bswap %0" : "=r" (_out) : "0" (IN)); _out; })
#endif
/* have ntoh, little host and unknown target */
#if (WITH_HOST_BYTE_ORDER == LITTLE_ENDIAN \
&& WITH_TARGET_BYTE_ORDER == 0 \
@ -240,7 +246,6 @@ do { \
#define T2H_2(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : htons(X))
#define T2H_1(X) (CURRENT_TARGET_BYTE_ORDER == CURRENT_HOST_BYTE_ORDER ? (X) : (X))
#endif
#endif
/* if all else fails use software */
#ifndef H2T_1