bug in gcc 2.95.1 on SPARC Solaris

Tue Aug 31 22:45:00 GMT 1999

Igor Schein <igor@txc.com> writes:
> On Fri, Aug 20, 1999 at 12:58:23PM +0900, GOTOH Norifumi wrote:
> > * Environments:
> > 
> > architecture:	SPARC, UltraSPARC I processor
> > os:		Solaris 2.6
> > gcc version:	both 2.95 & 2.95.1
> > 
> > 
> > * The complete input file (named test.c):
> > --------------------------------------------------------
> > #include <stdio.h>
> > int main(int argc, char** argv)
> > {
> >   double d1, d2, d3, d4;
> >   d1 = (double)argc;
> >   d2 = d1*1.2;
> >   d3 = d2*1.2;
> >   d4 = d3*1.2;
> >   return printd(d1, d2, d3, d4);
> > }
> > 
> > int printd(double d1, double d2, double d3, double d4)
> > {
> >   return printf("%f:%f:%f:%f\n", d1, d2, d3, d4);
> > }
> > --------------------------------------------------------
> > 
> > 
> > * The command arguments you gave GNU CC or GNU C++ to compile that
> >   example and observe the bug.  For example, did you use `-O'?  To
> >   guarantee you won't omit something important, list all the options.
> > 
> >   % gcc -O2 -o test test.c
> >   % ./test
> >   zsh: bus error (core dumped)  ./test
> 
> I can't reproduce this with 2.95.1.  Why not send .ii and .s files?
> Which assembler are you using, Sun or GNU?

I am using Sun's as.

% gcc -print-prog-name=as
/usr/ccs/bin/as

The following assembler output has a line:
	std	%f2, [%sp+92]
which breaks 8-byte alignment to store doubles.

% gcc -o test.s -S -O2 test.c
[test.s]
	.file	"test.c"
gcc2_compiled.:
.section	".rodata"
	.align 8
.LLC0:
	.uaword	0x3ff33333 ! ~1.19999999999999995559e0
	.uaword	0x33333333
.section	".text"
	.align 32
	.global main
	.type	 main,#function
	.proc	04
main:
	!#PROLOGUE# 0
	save	%sp, -128, %sp
	!#PROLOGUE# 1
	sethi	%hi(.LLC0), %g2
	st	%i0, [%fp-20]
	ldd	[%g2+%lo(.LLC0)], %f4
	ld	[%fp-20], %f6
	fitod	%f6, %f2
	std	%f2, [%fp-16]
	ldd	[%fp-16], %g2
	fmuld	%f2, %f4, %f2
	mov	%g2, %o0
	mov	%g3, %o1
	std	%f2, [%fp-16]
	ldd	[%fp-16], %o4
	fmuld	%f2, %f4, %f2
	mov	%o4, %o2
	mov	%o5, %o3
	std	%f2, [%fp-16]
	ldd	[%fp-16], %g2
	fmuld	%f2, %f4, %f2
	mov	%g2, %o4
	mov	%g3, %o5
	call	printd, 0
	std	%f2, [%sp+92]
	ret
	restore %g0, %o0, %o0
.LLfe1:
	.size	 main,.LLfe1-main
.section	".rodata"
	.align 8
.LLC1:
	.asciz	"%f:%f:%f:%f\n"
.section	".text"
	.align 32
	.global printd
	.type	 printd,#function
	.proc	04
printd:
	!#PROLOGUE# 0
	save	%sp, -128, %sp
	!#PROLOGUE# 1
	sethi	%hi(.LLC1), %o0
	mov	%i0, %o1
	ld	[%fp+92], %o2
	mov	%i4, %o5
	or	%o0, %lo(.LLC1), %o0
	ld	[%fp+96], %o3
	mov	%i3, %o4
	st	%i5, [%sp+92]
	std	%o2, [%sp+96]
	mov	%i1, %o2
	call	printf, 0
	mov	%i2, %o3
	ret
	restore %g0, %o0, %o0
.LLfe2:
	.size	 printd,.LLfe2-printd
	.ident	"GCC: (GNU) 2.95.1 19990816 (release)"

% gcc -o test.ii -E -O2 test.c
[test.ii]
# 1 "test.c"
# 1 "/usr/include/stdio.h" 1 3

#pragma ident	"@(#)stdio.h	1.49	97/05/09 SMI"	

# 1 "/usr/include/sys/feature_tests.h" 1 3

#pragma ident	"@(#)feature_tests.h	1.13	97/06/26 SMI"

# 17 "/usr/include/stdio.h" 2 3

# 1 "/usr/include/sys/va_list.h" 1 3

#pragma ident	"@(#)va_list.h	1.6	96/01/26 SMI"

# 41 "/usr/include/sys/va_list.h" 3

typedef void *__va_list;

# 18 "/usr/include/stdio.h" 2 3

typedef unsigned int	size_t;

typedef	long long	__longlong_t;

typedef long		off_t;

typedef __longlong_t	off64_t;

typedef long		fpos_t;

typedef __longlong_t	fpos64_t;

# 122 "/usr/include/stdio.h" 3

typedef struct	 
{

	int		_cnt;	 
	unsigned char	*_ptr;	 

	unsigned char	*_base;	 
	unsigned char	_flag;	 
	unsigned char	_file;	 
} FILE;

extern FILE		__iob[20 ];

extern FILE		*_lastbuf;
extern unsigned char	*_bufendtab[];

extern unsigned char	 _sibuf[], _sobuf[];

# 222 "/usr/include/stdio.h" 3

extern int	remove(const char *);
extern int	rename(const char *, const char *);
extern FILE	*tmpfile(void);
extern char	*tmpnam(char *);

extern int	fclose(FILE *);
extern int	fflush(FILE *);
extern FILE	*fopen(const char *, const char *);
extern FILE	*freopen(const char *, const char *, FILE *);
extern void	setbuf(FILE *, char *);

extern void setbuffer(FILE *, char *, size_t);
extern int setlinebuf(FILE *);

extern int	setvbuf(FILE *, char *, int, size_t);

extern int	fprintf(FILE *, const char *, ...);

extern int	fscanf(FILE *, const char *, ...);

extern int	printf(const char *, ...);

extern int	scanf(const char *, ...);

extern int	snprintf(char *, size_t, const char *, ...);

extern int	sprintf(char *, const char *, ...);

extern int	sscanf(const char *, const char *, ...);
extern int	vfprintf(FILE *, const char *, __va_list);
extern int	vprintf(const char *, __va_list);

extern int	vsnprintf(char *, size_t, const char *, __va_list);

extern int	vsprintf(char *, const char *, __va_list);
extern int	fgetc(FILE *);
extern char	*fgets(char *, int, FILE *);
extern int	fputc(int, FILE *);
extern int	fputs(const char *, FILE *);
extern int	getc(FILE *);
extern int	getchar(void);
extern char	*gets(char *);
extern int	putc(int, FILE *);
extern int	putchar(int);
extern int	puts(const char *);
extern int	ungetc(int, FILE *);
extern size_t	fread(void *, size_t, size_t, FILE *);
extern size_t	fwrite(const void *, size_t, size_t, FILE *);
extern int	fgetpos(FILE *, fpos_t *);
extern int	fseek(FILE *, long, int);
extern int	fsetpos(FILE *, const fpos_t *);
extern long	ftell(FILE *);
extern void	rewind(FILE *);
extern void	clearerr(FILE *);
extern int	feof(FILE *);
extern int	ferror(FILE *);
extern void	perror(const char *);

extern int	__filbuf(FILE *);
extern int	__flsbuf(int, FILE *);

extern FILE	*fdopen(int, const char *);
extern char	*ctermid(char *);
extern int	fileno(FILE *);

# 319 "/usr/include/stdio.h" 3

extern FILE	*popen(const char *, const char *);
extern char	*cuserid(char *);
extern char	*tempnam(const char *, const char *);
extern int	getopt(int, char *const *, const char *);

extern int	getsubopt(char **, char *const *, char **);

extern char	*optarg;
extern int	optind, opterr, optopt;
extern int	getw(FILE *);
extern int	putw(int, FILE *);
extern int	pclose(FILE *);

extern int	fseeko(FILE *, off_t, int);
extern off_t	ftello(FILE *);

extern FILE	*fopen64(const char *, const char *);
extern FILE	*freopen64(const char *, const char *, FILE *);
extern FILE	*tmpfile64(void);
extern int	fgetpos64(FILE *, fpos64_t *);
extern int	fsetpos64(FILE *, const fpos64_t *);
extern int	fseeko64(FILE *, off64_t, int);
extern off64_t	ftello64(FILE *);

# 467 "/usr/include/stdio.h" 3

# 515 "/usr/include/stdio.h" 3

# 1 "test.c" 2

int main(int argc, char** argv)
{
  double d1, d2, d3, d4;
  d1 = (double)argc;
  d2 = d1*1.2;
  d3 = d2*1.2;
  d4 = d3*1.2;
  return printd(d1, d2, d3, d4);
}

int printd(double d1, double d2, double d3, double d4)
{
  return printf("%f:%f:%f:%f\n", d1, d2, d3, d4);
}