gcc loop unrolling problem ??

["Konark Goel, Noida" <konarkg at noida dot hcltech dot com>]

I compiled a gcc testcase with only -O3 option and also with -O3 and
-funroll-all-loops options combined.... For the first case (-O3 option) it
is generating quite a correct assembly...but in case of -funroll-all-loops
it is generating quite a no. of calls, which actually is not needed. I guess
there's some problem in it. Also the no. of calls being generated is
dependent upon the minimum and maximum values in the switch cases !! 

the testcase is this : 

/* TestCase starts here */
extern int getch();
extern int class();

int
token()
{
    int state = 1;

    while (1) {
	int c=0;
	c = getch();
	switch (state) {
	case 1: break;
	case 4: break;
	case 5: break;
	case 6: 
            {
	        switch (class(c)) {
	        default: break;
	        }
	    } break;
	case 7:	break;
	}
    }
}
/* TestCase ends.....*/


;Assembly for -O3 -funroll-all-loops case ....

	.file	"990801-1.c"
	.text
	.p2align 2,,3
.globl token
	.type	token,@function
token:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$8, %esp
	.p2align 2,,3
.L16:
	call	getch
	call	getch
	call	getch
	call	getch
	call	getch
	call	getch
	call	getch
	call	getch
	jmp	.L16
.Lfe1:
	.size	token,.Lfe1-token
	.ident	"GCC: (GNU) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)"


;assembly for only -O3 condition...

.file	"990801-1.c"
	.text
	.p2align 2,,3
.globl token
	.type	token,@function
token:
	pushl	%ebp
	movl	%esp, %ebp
	subl	$8, %esp
	.p2align 2,,3
.L16:
	call	getch
	jmp	.L16
.Lfe1:
	.size	token,.Lfe1-token
	.ident	"GCC: (GNU) 3.2.2 20030222 (Red Hat Linux 3.2.2-5)"

;assembly ends..


as is clear it creates a strange assembly with -O3 -funroll-all-loops
option......Is this a BUG ??

hoping to get a quick response..

thanks,
Kon ??
"The answer is out there....,
  Its the question that drives us...."