Fikret Skrgic
int main()
{
unsigned * a=malloc(100000000*sizeof(unsigned)), * b=a+1, * c=a+2, *
d=a+3;
register unsigned x, y, z, w;
register int i;
for(i=0;i<6250000;i++)
{
x+=*a;
a+=4;
y+=*b;
b+=4;
z+=*c;
c+=4;
w+=*d;
d+=4;
x+=*a;
a+=4;
y+=*b;
b+=4;
z+=*c;
c+=4;
w+=*d;
d+=4;
x+=*a;
a+=4;
y+=*b;
b+=4;
z+=*c;
c+=4;
w+=*d;
d+=4;
x+=*a;
a+=4;
y+=*b;
b+=4;
z+=*c;
c+=4;
w+=*d;
d+=4;
}
x+=(y+z+w);
}
.file "bug.c"
.text
.globl main
.type main, @function
main:
pushl %ebp
movl %esp, %ebp
subl $24, %esp
andl $-16, %esp
movl $0, %eax
addl $15, %eax
addl $15, %eax
shrl $4, %eax
sall $4, %eax
subl %eax, %esp
subl $12, %esp
pushl $400000000
call malloc
addl $16, %esp
movl %eax, -4(%ebp)
movl -4(%ebp), %eax
addl $4, %eax
movl %eax, -8(%ebp)
movl -4(%ebp), %eax
addl $8, %eax
movl %eax, -12(%ebp)
movl -4(%ebp), %eax
addl $12, %eax
movl %eax, -16(%ebp)
movl $0, -20(%ebp)
.L2:
cmpl $6249999, -20(%ebp)
jg .L3
leal -4(%ebp), %eax
addl $16, (%eax)
leal -8(%ebp), %eax
addl $16, (%eax)
leal -12(%ebp), %eax
addl $16, (%eax)
leal -16(%ebp), %eax
addl $16, (%eax)
leal -4(%ebp), %eax
addl $16, (%eax)
leal -8(%ebp), %eax
addl $16, (%eax)
leal -12(%ebp), %eax
addl $16, (%eax)
leal -16(%ebp), %eax
addl $16, (%eax)
leal -4(%ebp), %eax
addl $16, (%eax)
leal -8(%ebp), %eax
addl $16, (%eax)
leal -12(%ebp), %eax
addl $16, (%eax)
leal -16(%ebp), %eax
addl $16, (%eax)
leal -4(%ebp), %eax
addl $16, (%eax)
leal -8(%ebp), %eax
addl $16, (%eax)
leal -12(%ebp), %eax
addl $16, (%eax)
leal -16(%ebp), %eax
addl $16, (%eax)
incl -20(%ebp)
jmp .L2
.L3:
leave
ret
.size main, .-main
.section .note.GNU-stack,"",@progbits
.ident "GCC: (GNU) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)"
.file "bug.c"
.text
.p2align 2,,3
.globl main
.type main, @function
main:
pushl %ebp
movl %esp, %ebp
subl $8, %esp
andl $-16, %esp
subl $28, %esp
pushl $400000000
call malloc
addl $16, %esp
movl $6249999, %eax
.p2align 2,,3
.L5:
decl %eax
jns .L5
leave
ret
.size main, .-main
.section .note.GNU-stack,"",@progbits
.ident "GCC: (GNU) 3.4.2 20041017 (Red Hat 3.4.2-6.fc3)"
