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attack the biggest stack users:

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-mkfs_minix_main [busybox_unstripped]:                  4288
-mkfs_minix_main [busybox_unstripped]:                  4276
-grave [busybox_unstripped]:                            4260
(bzip2 users too - not listed)

price we pay in code size increase:
mainSort                                            2458    2515     +57
grave                                               1005    1058     +53
sendMTFValues                                       2177    2195     +18
BZ2_blockSort                                        122     125      +3
mkfs_minix_main                                     3070    3022     -48
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/1 up/down: 131/-48)            Total: 83 bytes
This commit is contained in:
Denis Vlasenko
2007-12-02 08:35:37 +00:00
parent 8003e266ed
commit ab801874f8
8 changed files with 85 additions and 20 deletions
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10
archival/bz/compress.c
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@@ -264,13 +264,16 @@ void sendMTFValues(EState* s)
* are also globals only used in this proc.
* Made global to keep stack frame size small.
*/
#define code sendMTFValues__code
#define rfreq sendMTFValues__rfreq
#define len_pack sendMTFValues__len_pack
uint16_t cost[BZ_N_GROUPS];
int32_t fave[BZ_N_GROUPS];
uint16_t* mtfv = s->mtfv;
alphaSize = s->nInUse+2;
alphaSize = s->nInUse + 2;
for (t = 0; t < BZ_N_GROUPS; t++)
for (v = 0; v < alphaSize; v++)
s->len[t][v] = BZ_GREATER_ICOST;
@@ -453,7 +456,7 @@ void sendMTFValues(EState* s)
/* maxLen was changed from 20 to 17 in bzip2-1.0.3. See
* comment in huffman.c for details. */
for (t = 0; t < nGroups; t++)
BZ2_hbMakeCodeLengths(&(s->len[t][0]), &(s->rfreq[t][0]), alphaSize, 17 /*20*/);
BZ2_hbMakeCodeLengths(s, &(s->len[t][0]), &(s->rfreq[t][0]), alphaSize, 17 /*20*/);
}
AssertH(nGroups < 8, 3002);
@@ -602,6 +605,9 @@ void sendMTFValues(EState* s)
selCtr++;
}
AssertH(selCtr == nSelectors, 3007);
#undef code
#undef rfreq
#undef len_pack
}