Internal compiler error in `reverse_condition', at jump.c:3260 , i80x86, using asm()

[Etienne Lorrain]

  Hello,

  I am using GCC-2.95.3-pre2 but IHMO it does not matter.

  I would like to write this:

extern inline void gpokeb (unsigned offset, unsigned char value)
  {
  asm volatile (" movb %c0,%%gs:(%1) "
		: : "qi" (value), "g" (offset));
  }

  i.e. move a constant _or_ a register to a gs-relative address,
 which can itself be constant or variable.

  When I use with the "value" variable, I get:

user.c: In function `EGA_setpixel':
user.c:2119: Internal compiler error in `reverse_condition', at jump.c:3260
Please submit a full bug report.
See <URL: http://www.gnu.org/software/gcc/bugs.html > for instructions.

  because probably the "%c0" is not valid - it is more waiting "%w0"
 or "%b0" to match register "%al". But I need the "%c0" for constants
 to add the "$"...

  One solution could be:
extern inline void gpokeb (unsigned offset, unsigned char value)
  {
  if (__builtin_constant_p (offset)) {
      if (__builtin_constant_p (value))
	  asm volatile (" movb %c0,%%gs:%a1 "  : : "i" (value), "g" (offset));
	else
	  asm volatile (" movb %0,%%gs:%a1 "  : : "q" (value), "g" (offset));
      }
    else {
      if (__builtin_constant_p (value))
	  asm volatile (" movb %c0,%%gs:(%1) "  : : "i" (value), "g" (offset));
	else
	  asm volatile (" movb %0,%%gs:(%1) "  : : "q" (value), "g" (offset));
      }
  }

  But then I have the warning:
gmem.h:271: warning: asm operand 0 probably doesn't match constraints

  Also, some combination of "offset" need "%a1" and other needs "(%1)",
 I did not investigate this totally.

  IHMO "%c0" should be treated as "%0" when a register is used, like you
 can write "%w1" and the "w" is ignored if that word is the content of
 a memory location.

  Am I doing something very wrong here?
  Thanks,
  Etienne.

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