Subject:
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Re: memcpy patch for gcc 2.95.2 wanted
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Sun, 26 Mar 2000 17:43:07 GMT
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Viewed:
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2282 times
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On Sun, 26 Mar 2000, Les Smithson wrote:
> I think the compiler was generating incorrect code. I'm no gcc expert, but the
> asm macros looked OK to me, and besides, why should the macro work in one
> compiler version & not the other?
Because there were some decisions made as to what "incorrect" macros were
and weren't by the egcs/gcc teams. For some time, this made compiling the
Linux kernel with the newest egcs a serious problem.
> FYI, I fixed it by compiling the source to an assembler file (using -S), then
> hacking the assembler file. Just remove memcpy.c from the build tree and leave
> memcpy.s in its place. Beware the 'make realclean' will remove all '.s' files.
> Here's a copy of the fixed assembler code, memcpy.s:
>
> ; GCC For the Hitachi H8/300
> ; By Hitachi America Ltd and Cygnus Support
> ; release F-1
> ; -O2
>
>
> .file "memcpy.c"
> .section .text
> .align 1
> .global _memcpy
> _memcpy:
> mov.w r1,r3
> add.w r2,r3
> ; #APP
>
> 0:cmp r1,r3
> beq 1f
> mov.b @r1+,r2l
> mov.b r2l,@r0
> adds #1,r0
> bra 0b
> 1:
>
> ; #NO_APP
> rts
> .end
Cool.
-Luis
>
#######################################################################
Profanity is the one language that all programmers understand.
-Anonymous
#######################################################################
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Message has 1 Reply:
 | | Re: memcpy patch for gcc 2.95.2 wanted
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| (...) IMHO it is better anyway to use pure assembly files when generating code like memcpy (which is completely in assembly here). Call them memcpy.S, and you won't have the problem of accidentially removing them. With this you can use 'c' style (...) (25 years ago, 26-Mar-00, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: memcpy patch for gcc 2.95.2 wanted
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| (...) I think the compiler was generating incorrect code. I'm no gcc expert, but the asm macros looked OK to me, and besides, why should the macro work in one compiler version & not the other? FYI, I fixed it by compiling the source to an assembler (...) (25 years ago, 26-Mar-00, to lugnet.robotics.rcx.legos)
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