|
| From: | Christian Franke |
| Subject: | Re: Endianness macros capitalization |
| Date: | Fri, 11 Jul 2008 15:21:11 +0200 |
| User-agent: | Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.11) Gecko/20071128 SeaMonkey/1.1.7 |
Pavel Roskin wrote:
Quoting Pavel Roskin <address@hidden>:366976 original 364988 "=q", xchgb 365460 "=q", rolw $8,%w0 365420 "=r", rolw $8,%w0 364996 monstrosity ("=r", conditional xchgb/rolw) 364728 "little details"Marginally better (by just 12 bytes): 364716 "little details" + "monstrosity"
Very nice optimization idea!The practical advantage is probably limited by the fact that kernel.img and most of the modules typically included in a i386-pc core.img are not affected.
I attached a diff of "size *.mod" outputs for the test mentioned in my last mail. '-' original code, '+' grub_swap_*() replaced by dummies. Large savings potential is in afs.mod, hfs*.mod, and xfs.mod.
Christian
--- sizes.original 2008-07-10 20:33:57.968750000 +0200
+++ sizes.noswap 2008-07-10 20:34:03.046875000 +0200
@@ -1,78 +1,78 @@
text data bss dec hex filename
4352 24 160 4536 11b8 _bsd.mod
564 8 48 620 26c _chain.mod
2128 8 48 2184 888 _linux.mod
6528 48 128 6704 1a30 _multiboot.mod
820 28 0 848 350 acorn.mod
- 2552 44 16 2612 a34 affs.mod
- 5532 40 16 5588 15d4 afs.mod
- 960 28 16 1004 3ec amiga.mod
+ 2136 44 16 2196 894 affs.mod
+ 2656 40 16 2712 a98 afs.mod
+ 692 28 16 736 2e0 amiga.mod
212 8 0 220 dc aout.mod
- 1000 28 16 1044 414 apple.mod
- 3028 36 16 3080 c08 ata.mod
+ 888 28 16 932 3a4 apple.mod
+ 2948 36 16 3000 bb8 ata.mod
1756 44 16 1816 718 biosdisk.mod
876 8 16 900 384 bitmap.mod
764 20 0 784 310 blocklist.mod
148 16 0 164 a4 boot.mod
628 16 0 644 284 bsd.mod
424 16 0 440 1b8 cat.mod
340 24 0 364 16c chain.mod
684 16 0 700 2bc cmp.mod
396 20 0 416 1a0 configfile.mod
1228 36 16 1280 500 cpio.mod
332 16 16 364 16c cpuid.mod
620 16 0 636 27c echo.mod
2292 12 0 2304 900 elf.mod
2044 44 16 2104 838 ext2.mod
2816 32 16 2864 b30 fat.mod
832 32 16 880 370 font.mod
1208 8 0 1216 4c0 fshelp.mod
3480 132 224 3836 efc gfxterm.mod
1032 32 16 1080 438 gpt.mod
5808 488 0 6296 1898 gzio.mod
284 16 0 300 12c halt.mod
116 16 0 132 84 hello.mod
480 16 0 496 1f0 help.mod
1220 20 0 1240 4d8 hexdump.mod
- 4252 32 64 4348 10fc hfs.mod
- 4184 44 16 4244 1094 hfsplus.mod
- 3128 44 16 3188 c74 iso9660.mod
+ 3220 32 64 3316 cf4 hfs.mod
+ 2628 44 16 2688 a80 hfsplus.mod
+ 3108 44 16 3168 c60 iso9660.mod
2916 32 16 2964 b94 jfs.mod
- 3968 40 0 4008 fa8 jpeg.mod
+ 3956 40 0 3996 f9c jpeg.mod
232 24 0 256 100 linux.mod
1076 52 16 1144 478 loopback.mod
1452 12 0 1464 5b8 ls.mod
2244 20 0 2264 8d8 lspci.mod
3260 36 32 3328 d00 lvm.mod
484 40 32 556 22c memdisk.mod
2512 36 16 2564 a04 minix.mod
264 32 0 296 128 multiboot.mod
25268 104 1936 27308 6aac normal.mod
5576 44 32 5652 1614 ntfs.mod
1880 20 0 1900 76c ntfscomp.mod
1604 24 16 1644 66c pc.mod
188 4 0 192 c0 pci.mod
604 16 0 620 26c play.mod
- 4144 24 0 4168 1048 png.mod
+ 4108 24 0 4132 1024 png.mod
3312 40 16 3368 d28 raid.mod
276 16 0 292 124 read.mod
108 16 0 124 7c reboot.mod
7308 48 16 7372 1ccc reiserfs.mod
1164 16 0 1180 49c search.mod
2492 216 96 2804 af4 serial.mod
- 2284 40 16 2340 924 sfs.mod
+ 1836 40 16 1892 764 sfs.mod
540 16 32 588 24c sleep.mod
- 1056 24 16 1096 448 sun.mod
+ 948 24 16 988 3dc sun.mod
416 20 0 436 1b4 terminal.mod
5188 28 512 5728 1660 terminfo.mod
264 16 0 280 118 test.mod
1468 24 0 1492 5d4 tga.mod
2724 52 16 2792 ae8 udf.mod
2936 52 16 3004 bbc ufs.mod
8832 204 1952 10988 2aec vbe.mod
624 20 0 644 284 vbeinfo.mod
1172 20 0 1192 4a8 vbetest.mod
1668 108 13584 15360 3c00 vga.mod
1284 8 32 1324 52c video.mod
732 32 0 764 2fc videotest.mod
- 4980 40 16 5036 13ac xfs.mod
+ 2924 40 16 2980 ba4 xfs.mod
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