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Overview
| Comment: | Repaired the lost performance in the copy loop hotspots. Now meets or beats the former trunk (and current trunk by magnitudes) in tclbench. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | revert-3396731 |
| Files: | files | file ages | folders |
| SHA1: |
34daf5b5b37cfe8bb11d71642c5e4b46 |
| User & Date: | dgp 2011-08-27 02:28:47 |
| Original Comment: | Repaired the lost performance in the copy loop hotspots. Now meets or beats the former trunk (and current trunk by magnitudes) in tclbench. |
Context
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2011-08-27
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| 04:24 | 3396731 Revise the [string reverse] implementation to operate on the representation that comes in, a... check-in: dc7f1a9b04 user: dgp tags: trunk | |
| 02:28 | Repaired the lost performance in the copy loop hotspots. Now meets or beats the former trunk (and ... Closed-Leaf check-in: 34daf5b5b3 user: dgp tags: revert-3396731 | |
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2011-08-25
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| 16:26 | 3396731 Another rewrite of TclStringObjReverse() to make it adopt the nijtmans approach for reversin... check-in: 61d345ff2f user: dgp tags: revert-3396731 | |
Changes
Changes to generic/tclStringObj.c.
| ︙ | ︙ | |||
2656 2657 2658 2659 2660 2661 2662 2663 2664 |
void
ReverseBytes(
unsigned char *to, /* Copy bytes into here... */
unsigned char *from, /* ...from here... */
int count) /* Until this many are copied, */
/* reversing as you go. */
{
if (to == from) {
/* Reversing in place */
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void
ReverseBytes(
unsigned char *to, /* Copy bytes into here... */
unsigned char *from, /* ...from here... */
int count) /* Until this many are copied, */
/* reversing as you go. */
{
unsigned char *src = from + count - 1;
if (to == from) {
/* Reversing in place */
while (to < src) {
unsigned char c = *src;
*src-- = *to;
*to++ = c;
}
} else {
while (src >= from) {
*to++ = *src--;
}
}
}
void
ReverseUniChars(
Tcl_UniChar *to, /* Copy Tcl_UniChars into here... */
Tcl_UniChar *from, /* ...from here... */
unsigned int count) /* Until this many are copied, */
/* reversing as you go. */
{
Tcl_UniChar *src = from + count - 1;
if (to == from) {
/* Reversing in place */
from += count - 1;
while (to < src) {
Tcl_UniChar c = *src;
*src-- = *to;
*to++ = c;
}
} else {
while (src >= from) {
*to++ = *src--;
}
}
}
Tcl_Obj *
TclStringObjReverse(
Tcl_Obj *objPtr)
|
| ︙ | ︙ |