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Date: Wed, 7 Oct 1998 15:30:38 +0200 (METDST)
Message-Id: <199810071330.PAA22126@king.ki.informatik.uni-frankfurt.de>
From: Marko Schuetz <marko@ki.informatik.uni-frankfurt.de>
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Subject:  Global register variables in gcc and stdio.h?!?
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An application I want to compile runs much faster if it can use global
register variables.

Trying to compile it I get 

[...]
gmake[1]: Entering directory `/usr/home/marko/src/mercury-0.7.3.orig/runtime'
MERCURY_C_INCL_DIR=. ../scripts/mgnuc --grade asm_fast.gc --no-ansi -I../runtime -I../boehm_gc -g   -c label.c -o label.o
In file included from regs.h:67,
                 from imp.h:36,
                 from label.c:19:
machdeps/i386_regs.h:61: global register variable follows a function definition
machdeps/i386_regs.h:62: global register variable follows a function definition
machdeps/i386_regs.h:67: global register variable follows a function definition
gmake[1]: *** [label.o] Error 1
gmake[1]: Leaving directory `/usr/home/marko/src/mercury-0.7.3.orig/runtime'
gmake: *** [runtime] Error 2

I checked the preprocessor output and found that there is only the 
function definition for `static __inline int __sputc(int _c, FILE
*_p)` which is included from stdio.h. Depending on an #ifdef that
version of __sputc or an alternative as a macro is used.

I would suggest adding something like
!defined(__USE_GLOBAL_REGISTER_VARIABLES__) to the condition for using
the inline function.

Doing that allows at least mercury to compile using global register
variables. 

Please comment. 

Marko

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