From: Damon Hogan <damonh AT pgmincorporated DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: 388: fixed or forbidden register 0 (ax) was spilled for class AREG. fly.
Date: Wed, 15 Mar 2000 17:45:45 -0700
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To: djgpp AT delorie DOT com
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I am compiling the fly.exe program for the plush3d library and I get the
following error messages. I get the same error messages on other
libraries,/programs that I try to compile with inline assembly code.  I
think that this is a problem with djgpp's gcc I'm
not sure.

fly.c: In function `main': fly.
c:55: warning: return type of `main' is not `int' fly.
c: In function `mouse_init': fly.
c:388: Invalid `asm' statement: fly.
c:388: fixed or forbidden register 0 (ax) was spilled for class AREG.
fly.
c: In function `mouse_get': fly.c:404: Invalid `asm' statement: fly.
c:404: fixed or forbidden register 1 (dx) was spilled for class DREG.
fly.
c:412: Invalid `asm' statement: fly.
c:412: fixed or forbidden register 3 (bx) was spilled for class BREG.
fly.
c: In function `set_palette': fly.
c:371: Invalid `asm' statement: fly.
c:371: fixed or forbidden register 4 (si) was spilled for class SIREG.
fly.
c: In function `set_mode13': fly.
c:376: Invalid `asm' statement: fly.
c:376: fixed or forbidden register 0 (ax) was spilled for class AREG.
fly.
c: In function `set_mode3': fly.
c:380: Invalid `asm' statement: fly.
c:380: fixed or forbidden register 0 (ax) was spilled for class AREG.
fly.
c: In function `fpucopy': fly.c:345: Invalid `asm' statement: fly.
c:345: fixed or forbidden register 2 (cx) was spilled for class CREG.
make.exe: *** [fly.o] Error 1  C:\djgpp\contrib\plush\examples\fly>


The code section for this is below and the errors seem to be on lines
that all have the
same coding scheme for this and other programs written that have this
same problem.

Does any body know how to adjust this code or fix the compiler to work?

Code examples listed below.

Stars (*) by the error lines.


331:static void inline fpucopy(void *o, void *i, int len16) {
332:  __asm__ __volatile__("
333:   .align 4, 0x90
334:    0:
335:    fildq (%%esi)
336:    fildq 8(%%esi)
337:    fxch
338:    fistpq (%%edi)
339:    fistpq 8(%%edi)
340:    addl $16, %%edi
341:    addl $16, %%esi
342:    decl %%ecx
343:    jnz 0b
344:  "::"c" (len16), "S" (i), "D" (o)
*345:   :"%ecx","%edi","%esi");
346:}
347:
348:void inline vsync() {
349:  __asm__ __volatile__ ("movw $0x3DA, %%dx
350:    0: inb %%dx, %%al ; andb $8, %%al ; jnz 0b
351:    0: inb %%dx, %%al ; andb $8, %%al ; jz 0b"
352:    :::"%edx", "%eax");
353:}
354:
355:void set_palette(char *pal) {
356:  __asm__ __volatile__("
357:    movl $768, %%ecx
358:    subl %%eax, %%eax
359:    movw $0x3C8, %%dx
360:    outb %%al, %%dx
361:    incw %%dx
362:    0:
363:      movb (%%esi), %%al
364:      #addl $2, %%eax
365:      shrl $2, %%eax
366:      outb %%al, %%dx
367:      incl %%esi
368:      subl %%eax, %%eax
369:      decl %%ecx
370:    jnz 0b
*371:  "::"S" (pal):"%esi", "%eax", "%edx", "%ecx");
372:}
373:
374:void set_mode13() {
375:  __djgpp_nearptr_enable();
376:  __asm__ __volatile__("int $0x10"::"a" (0x13):"%eax", "%ebx",
"%ecx", "%edx");
377:}
378:
379:void set_mode3() {
*380:  __asm__ __volatile__("int $0x10"::"a" (3):"%eax", "%ebx", "%ecx",
"%edx");
381:  __djgpp_nearptr_disable();
382:}
383:
384:void mouse_init() {
385:  __asm__ __volatile__("
386:    subl %%eax, %%eax
387:    int $0x33
*388:  ":"=a" (mouse_avail), "=b"
(mouse_buttons)::"%eax","%ebx","%ecx","%edx");
389:  if (!mouse_avail) {
390:    printf("Mouse not found ... you won't be able to move\n");
391:  }
392:  if (mouse_buttons > 3) mouse_buttons = 3;
393:  printf("%d button mouse found\n",mouse_buttons);
394:
395:}
396:
397:void mouse_get() {
398:  static signed short int old_mouse_x, old_mouse_y;
399:  signed short int mx, my;
400:  if (mouse_avail) {
401:    __asm__ __volatile__("
402:      movl $11, %%eax
403:      int $0x33
*404:    ":"=c" (mx), "=d" (my)::"%eax","%ebx","%ecx","%edx");
405:    mouse_x = (old_mouse_x + mx) * 0.5;
406:    mouse_y = (old_mouse_y + my) * 0.5;
407:    old_mouse_x = mx;
408:    old_mouse_y = my;
409:    __asm__ __volatile__("
410:      movl $3, %%eax
411:      int $0x33
*412:    ":"=b" (mouse_b)::"%eax","%ebx","%ecx","%edx");
413:    mouse_b &= 7;
414:  } else mouse_x = mouse_y = mouse_b = 0;
415:}
416:




--
Damon Hogan
Sr Programmer/Analyst
PGM, Inc.
damonh AT pgmincorporated DOT com
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