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dbConvert: optimize copy w/o convert

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Use memcpy() where input and output memory representations
are the exactly the same (integer and floating point types).

Assumes 2s complement integer types and that signed and
unsigned types have the same representation.
This commit is contained in:
Michael Davidsaver
2014-06-13 15:37:11 -04:00
committed by Michael Davidsaver
parent 0e28ff55c6
commit 1a0ba81d0d
1 changed files with 54 additions and 180 deletions
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234
src/ioc/db/dbConvert.c
View File

@@ -38,6 +38,29 @@
#include "recGbl.h"
#include "dbConvert.h"
/* Helper for copy as bytes with no type conversion.
* Assumes nRequest <= no_bytes
* nRequest, no_bytes, and offset should be given in bytes.
*/
static void copyNoConvert(const void *pfrom,
void *pto,
long nRequest,
long no_bytes,
long offset)
{
if(offset>0 && offset < no_bytes && offset+nRequest > no_bytes) {
const size_t N = no_bytes - offset;
/* copy with wrap */
memcpy(pto, pfrom + offset, N);
memcpy(pto + N, pfrom, nRequest - N);
} else {
/* no wrap, just copy */
memcpy(pto, pfrom + offset, nRequest);
}
}
#define COPYNOCONVERT(N, FROM, TO, NREQ, NO_ELEM, OFFSET) \
copyNoConvert(FROM, TO, (N)*(NREQ), (N)*(NO_ELEM), (N)*(OFFSET))
/* DATABASE ACCESS GET CONVERSION SUPPORT */
static long getStringString (
@@ -427,12 +450,7 @@ static long getCharChar(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(char *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(char), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -454,12 +472,7 @@ static long getCharUchar(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(char *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(char), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -638,12 +651,7 @@ static long getUcharChar(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(unsigned char *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned char), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -658,12 +666,7 @@ static long getUcharUchar(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(unsigned char *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned char), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -870,6 +873,7 @@ static long getShortUchar(
}
return(0);
}
static long getShortShort(
const dbAddr *paddr,
void *pto, long nRequest, long no_elements, long offset)
@@ -881,12 +885,7 @@ static long getShortShort(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(short *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(short), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -901,12 +900,7 @@ static long getShortUshort(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(short *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(short), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -1084,12 +1078,7 @@ static long getUshortShort(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(unsigned short *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned short), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -1104,12 +1093,7 @@ static long getUshortUshort(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(unsigned short *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned short), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -1328,12 +1312,7 @@ static long getLongLong(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(epicsInt32 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(long), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -1348,12 +1327,7 @@ static long getLongUlong(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(epicsInt32 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(long), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -1532,12 +1506,7 @@ static long getUlongLong(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(epicsUInt32 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned long), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -1552,12 +1521,7 @@ static long getUlongUlong(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(epicsUInt32 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned long), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -1782,12 +1746,7 @@ static long getFloatFloat(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(float *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(float), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -2013,12 +1972,7 @@ static long getDoubleDouble(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(double *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(double), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -2228,12 +2182,7 @@ static long getEnumEnum(
*pbuffer = *psrc;
return(0);
}
psrc += offset;
while (nRequest) {
*pbuffer++ = *psrc++;
if(++offset==no_elements) psrc=(epicsEnum16 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(epicsEnum16), paddr->pfield, pto, nRequest, no_elements, offset);
return(0);
}
@@ -2734,12 +2683,7 @@ static long putCharChar(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(char *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(char), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -2754,12 +2698,7 @@ static long putCharUchar(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(unsigned char *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned char), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -2940,12 +2879,7 @@ static long putUcharChar(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(char *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned char), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -2960,12 +2894,7 @@ static long putUcharUchar(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(unsigned char *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned char), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -3186,12 +3115,7 @@ static long putShortShort(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(short *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(short), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -3206,12 +3130,7 @@ static long putShortUshort(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(unsigned short *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(short), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -3392,12 +3311,7 @@ static long putUshortShort(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(short *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned short), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -3412,12 +3326,7 @@ static long putUshortUshort(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(unsigned short *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(unsigned short), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -3638,12 +3547,7 @@ static long putLongLong(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(epicsInt32 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(epicsInt32), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -3658,12 +3562,7 @@ static long putLongUlong(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(epicsUInt32 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(epicsInt32), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -3844,12 +3743,7 @@ static long putUlongLong(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(epicsInt32 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(epicsUInt32), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -3864,12 +3758,7 @@ static long putUlongUlong(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(epicsUInt32 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(epicsUInt32), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -4095,12 +3984,7 @@ static long putFloatFloat(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(float *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(float), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -4327,12 +4211,7 @@ static long putDoubleDouble(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(double *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(double), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}
@@ -4553,12 +4432,7 @@ static long putEnumEnum(
*pdest = *pbuffer;
return(0);
}
pdest += offset;
while (nRequest) {
*pdest++ = *pbuffer++;
if(++offset==no_elements) pdest=(epicsEnum16 *)paddr->pfield;
nRequest--;
}
COPYNOCONVERT(sizeof(epicsEnum16), pfrom, paddr->pfield, nRequest, no_elements, offset);
return(0);
}