I know about post_inc method for byte vars and it IS implemented. I have no idea why this does not work. still investigating.
~d On Thursday 21 August 2003 12:14, Ralf Guetlein wrote: > Dmitry, > > I posted a suggestion for optimization a week ago. > This seems to be a good candidate for the peephole optimizer. > See original post below. > > Ralf > > ----------------------- > > > "Ralf Guetlein" <ralf.guetl...@web.de> schrieb im Newsbeitrag > news:bh819s$5v...@sea.gmane.org... > > > Hi all, > > > > as you see in the disassembly listing below, there is > > a small lack of optimisation: > > > > The compiler refuses to use autoincrement when moving > > byte blocks. With integer values it works ok. > > > > move bytes: > > 6: ee 4f 00 00 mov.b @r15, 0(r14) ; > > a: 1f 53 inc r15 ; > > c: 1e 53 inc r14 ; > > > > move integers: > > 1c: be 4f 00 00 mov @r15+, 0(r14) ; > > 20: 2e 53 incd r14 ; > > > > I assume this can be fixed easily, but I'm not too much > > involved in gcc programming now, so I ask for your support. > > > > Regards, > > Ralf > > > > See the whole listing below: > > > > > > > > test.o: file format elf32-msp430 > > > > Disassembly of section .text: > > > > 00000000 <copybytes>: > > void copybytes(char *src, char *dst, int len) > > { > > while (len--) > > 0: 3d 53 add #-1, r13 ;r3 As==11 > > 2: 3d 93 cmp #-1, r13 ;r3 As==11 > > 4: 07 24 jz $+16 ;abs 0x14 > > *dst++ = *src++; > > 6: ee 4f 00 00 mov.b @r15, 0(r14) ; > > a: 1f 53 inc r15 ; > > c: 1e 53 inc r14 ; > > e: 3d 53 add #-1, r13 ;r3 As==11 > > 10: 3d 93 cmp #-1, r13 ;r3 As==11 > > 12: f9 23 jnz $-12 ;abs 0x6 > > } > > 14: 30 41 ret > > > > 00000016 <copywords>: > > > > > > void copywords(int *src, int *dst, int len) > > { > > while (len--) > > 16: 3d 53 add #-1, r13 ;r3 As==11 > > 18: 3d 93 cmp #-1, r13 ;r3 As==11 > > 1a: 06 24 jz $+14 ;abs 0x28 > > *dst++ = *src++; > > 1c: be 4f 00 00 mov @r15+, 0(r14) ; > > 20: 2e 53 incd r14 ; > > 22: 3d 53 add #-1, r13 ;r3 As==11 > > 24: 3d 93 cmp #-1, r13 ;r3 As==11 > > 26: fa 23 jnz $-10 ;abs 0x1c > > } > > 28: 30 41 ret > > ------------------------------------------------------- > This SF.net email is sponsored by: VM Ware > With VMware you can run multiple operating systems on a single machine. > WITHOUT REBOOTING! Mix Linux / Windows / Novell virtual machines > at the same time. Free trial click > here:http://www.vmware.com/wl/offer/358/0 > _______________________________________________ > Mspgcc-users mailing list > Mspgcc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/mspgcc-users -- /***************************************************************** ("`-''-/").___..--''"`-._ (\ Dimmy the Wild UA1ACZ `6_ 6 ) `-. ( ).`-.__.`) State Polytechnical Univ. (_Y_.)' ._ ) `._ `. ``-..-' Radio-Physics Departament _..`--'_..-_/ /--'_.' ,' Saint Petersburg, Russia (il),-'' (li),' ((!.-' +7 (812) 5403923, 5585314 *****************************************************************/
