[m-dev.] diff: work around gcc global register problem

[David Glen JEFFERY]

On 15-Nov-2000, Fergus Henderson <fjh at cs.mu.OZ.AU> wrote:
> Estimated hours taken: 1
> 
> library/string.m:
> 	Work around a GNU C problem in grade asm_fast.gc.tr.debug,
> 	where gcc failed to compile the recently-added `set_char' procedures,
> 	aborting with the following message:
> 
> 		string.c: In function `string_module70':
> 		string.c:46208: fixed or forbidden register 3 (bx) was
> 			spilled for class GENERAL_REGS.
> 		This may be due to a compiler bug or to impossible asm
> 		statements or clauses.
> 
> 	The work-around was to move the code which actually sets the
> 	character into a separate C function.

FYI, this bug also occurs in the random module in the library in one of
the HAL grades (asm_fast.gc.tr.rt.se.init, IIRC).

For now, I have just disabled the random library on the installation I do
at Monash. Do you want a bug report? It isn't affecting us at all, but maybe
the fix is as simple as the one in string.m, so you may want to fix it.


dgj
-- 
David Jeffery (dgj at cs.mu.oz.au) | If your thesis is utterly vacuous
PhD student,                    | Use first-order predicate calculus.
Dept. of Comp. Sci. & Soft. Eng.|     With sufficient formality
The University of Melbourne     |     The sheerist banality
Australia                       | Will be hailed by the critics: "Miraculous!"
                                |     -- Anon.
--------------------------------------------------------------------------
mercury-developers mailing list
Post messages to:       mercury-developers at cs.mu.oz.au
Administrative Queries: owner-mercury-developers at cs.mu.oz.au
Subscriptions:          mercury-developers-request at cs.mu.oz.au
--------------------------------------------------------------------------