Package: gcc-3.3 Version: 1:3.3.1-0pre0 Severity: minor The following program
-- #include <netinet/in.h> int main(struct sockaddr *fromp, int port) { const int family = fromp->sa_family; union { struct sockaddr_in6 in6; struct sockaddr_in in; } *const u = (void *)fromp; if (family == AF_INET6) u->in6.sin6_port = htons(port); else u->in.sin_port = htons(port); return 0; } -- when compiled with gcc-3.3 -S -O2 produces -- .file "b.c" .text .p2align 2,,3 .globl main .type main, @function main: pushl %ebp movl %esp, %ebp subl $8, %esp movl 8(%ebp), %edx andl $-16, %esp cmpw $10, (%edx) movl 12(%ebp), %eax je .L9 #APP rorw $8, %ax #NO_APP .L8: movw %ax, 2(%edx) leave xorl %eax, %eax ret .p2align 2,,3 .L9: #APP rorw $8, %ax #NO_APP jmp .L8 .size main, .-main .ident "GCC: (GNU) 3.3.1 20030626 (Debian prerelease)" -- As you can see, the branch due to the family is unnecessary. This bug exists in gcc272, gcc 2.95 and gcc 3.2 I've attached the preprocessed source. -- System Information Debian Release: testing/unstable Kernel Version: Linux gondolin 2.4.21-2-686-smp #1 SMP Sat Jul 5 01:42:22 EST 2003 i686 GNU/Linux Versions of the packages gcc-3.3 depends on: ii binutils 2.14.90.0.4-0. The GNU assembler, linker and binary utiliti ii cpp-3.3 3.3.1-0pre0 The GNU C preprocessor ii gcc-3.3-base 3.3.1-0pre0 The GNU Compiler Collection (base package) ii libc6 2.3.1-16 GNU C Library: Shared libraries and Timezone ii libgcc1 3.3.1-0pre0 GCC support library -- # 1 "b.c" # 1 "<built-in>" # 1 "<command line>" # 1 "b.c" # 1 "/usr/include/netinet/in.h" 1 3 4 # 22 "/usr/include/netinet/in.h" 3 4 # 1 "/usr/include/features.h" 1 3 4 # 291 "/usr/include/features.h" 3 4 # 1 "/usr/include/sys/cdefs.h" 1 3 4 # 292 "/usr/include/features.h" 2 3 4 # 314 "/usr/include/features.h" 3 4 # 1 "/usr/include/gnu/stubs.h" 1 3 4 # 315 "/usr/include/features.h" 2 3 4 # 23 "/usr/include/netinet/in.h" 2 3 4 # 1 "/usr/include/stdint.h" 1 3 4 # 27 "/usr/include/stdint.h" 3 4 # 1 "/usr/include/bits/wchar.h" 1 3 4 # 28 "/usr/include/stdint.h" 2 3 4 # 1 "/usr/include/bits/wordsize.h" 1 3 4 # 29 "/usr/include/stdint.h" 2 3 4 # 37 "/usr/include/stdint.h" 3 4 typedef signed char int8_t; typedef short int int16_t; typedef int int32_t; __extension__ typedef long long int int64_t; typedef unsigned char uint8_t; typedef unsigned short int uint16_t; typedef unsigned int uint32_t; __extension__ typedef unsigned long long int uint64_t; typedef signed char int_least8_t; typedef short int int_least16_t; typedef int int_least32_t; __extension__ typedef long long int int_least64_t; typedef unsigned char uint_least8_t; typedef unsigned short int uint_least16_t; typedef unsigned int uint_least32_t; __extension__ typedef unsigned long long int uint_least64_t; typedef signed char int_fast8_t; typedef int int_fast16_t; typedef int int_fast32_t; __extension__ typedef long long int int_fast64_t; typedef unsigned char uint_fast8_t; typedef unsigned int uint_fast16_t; typedef unsigned int uint_fast32_t; __extension__ typedef unsigned long long int uint_fast64_t; # 126 "/usr/include/stdint.h" 3 4 typedef int intptr_t; typedef unsigned int uintptr_t; # 138 "/usr/include/stdint.h" 3 4 __extension__ typedef long long int intmax_t; __extension__ typedef unsigned long long int uintmax_t; # 24 "/usr/include/netinet/in.h" 2 3 4 # 1 "/usr/include/bits/types.h" 1 3 4 # 28 "/usr/include/bits/types.h" 3 4 # 1 "/usr/include/bits/wordsize.h" 1 3 4 # 29 "/usr/include/bits/types.h" 2 3 4 # 1 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/stddef.h" 1 3 4 # 213 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/stddef.h" 3 4 typedef unsigned int size_t; # 32 "/usr/include/bits/types.h" 2 3 4 typedef unsigned char __u_char; typedef unsigned short int __u_short; typedef unsigned int __u_int; typedef unsigned long int __u_long; typedef signed char __int8_t; typedef unsigned char __uint8_t; typedef signed short int __int16_t; typedef unsigned short int __uint16_t; typedef signed int __int32_t; typedef unsigned int __uint32_t; __extension__ typedef signed long long int __int64_t; __extension__ typedef unsigned long long int __uint64_t; __extension__ typedef long long int __quad_t; __extension__ typedef unsigned long long int __u_quad_t; # 128 "/usr/include/bits/types.h" 3 4 # 1 "/usr/include/bits/typesizes.h" 1 3 4 # 129 "/usr/include/bits/types.h" 2 3 4 typedef unsigned long long int __dev_t; typedef unsigned int __uid_t; typedef unsigned int __gid_t; typedef unsigned long int __ino_t; typedef unsigned long long int __ino64_t; typedef unsigned int __mode_t; typedef unsigned int __nlink_t; typedef long int __off_t; typedef long long int __off64_t; typedef int __pid_t; typedef struct { int __val[2]; } __fsid_t; typedef long int __clock_t; typedef unsigned long int __rlim_t; typedef unsigned long long int __rlim64_t; typedef unsigned int __id_t; typedef long int __time_t; typedef unsigned int __useconds_t; typedef long int __suseconds_t; typedef int __daddr_t; typedef long int __swblk_t; typedef int __key_t; typedef int __clockid_t; typedef int __timer_t; typedef long int __blksize_t; typedef long int __blkcnt_t; typedef long long int __blkcnt64_t; typedef unsigned long int __fsblkcnt_t; typedef unsigned long long int __fsblkcnt64_t; typedef unsigned long int __fsfilcnt_t; typedef unsigned long long int __fsfilcnt64_t; typedef int __ssize_t; typedef __off64_t __loff_t; typedef __quad_t *__qaddr_t; typedef char *__caddr_t; typedef int __intptr_t; typedef unsigned int __socklen_t; # 25 "/usr/include/netinet/in.h" 2 3 4 enum { IPPROTO_IP = 0, IPPROTO_HOPOPTS = 0, IPPROTO_ICMP = 1, IPPROTO_IGMP = 2, IPPROTO_IPIP = 4, IPPROTO_TCP = 6, IPPROTO_EGP = 8, IPPROTO_PUP = 12, IPPROTO_UDP = 17, IPPROTO_IDP = 22, IPPROTO_TP = 29, IPPROTO_IPV6 = 41, IPPROTO_ROUTING = 43, IPPROTO_FRAGMENT = 44, IPPROTO_RSVP = 46, IPPROTO_GRE = 47, IPPROTO_ESP = 50, IPPROTO_AH = 51, IPPROTO_ICMPV6 = 58, IPPROTO_NONE = 59, IPPROTO_DSTOPTS = 60, IPPROTO_MTP = 92, IPPROTO_ENCAP = 98, IPPROTO_PIM = 103, IPPROTO_COMP = 108, IPPROTO_RAW = 255, IPPROTO_MAX }; typedef uint16_t in_port_t; enum { IPPORT_ECHO = 7, IPPORT_DISCARD = 9, IPPORT_SYSTAT = 11, IPPORT_DAYTIME = 13, IPPORT_NETSTAT = 15, IPPORT_FTP = 21, IPPORT_TELNET = 23, IPPORT_SMTP = 25, IPPORT_TIMESERVER = 37, IPPORT_NAMESERVER = 42, IPPORT_WHOIS = 43, IPPORT_MTP = 57, IPPORT_TFTP = 69, IPPORT_RJE = 77, IPPORT_FINGER = 79, IPPORT_TTYLINK = 87, IPPORT_SUPDUP = 95, IPPORT_EXECSERVER = 512, IPPORT_LOGINSERVER = 513, IPPORT_CMDSERVER = 514, IPPORT_EFSSERVER = 520, IPPORT_BIFFUDP = 512, IPPORT_WHOSERVER = 513, IPPORT_ROUTESERVER = 520, IPPORT_RESERVED = 1024, IPPORT_USERRESERVED = 5000 }; typedef uint32_t in_addr_t; struct in_addr { in_addr_t s_addr; }; # 190 "/usr/include/netinet/in.h" 3 4 struct in6_addr { union { uint8_t u6_addr8[16]; uint16_t u6_addr16[8]; uint32_t u6_addr32[4]; } in6_u; }; extern const struct in6_addr in6addr_any; extern const struct in6_addr in6addr_loopback; # 1 "/usr/include/bits/socket.h" 1 3 4 # 29 "/usr/include/bits/socket.h" 3 4 # 1 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/stddef.h" 1 3 4 # 30 "/usr/include/bits/socket.h" 2 3 4 # 1 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/limits.h" 1 3 4 # 11 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/limits.h" 3 4 # 1 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/syslimits.h" 1 3 4 # 1 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/limits.h" 1 3 4 # 122 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/limits.h" 3 4 # 1 "/usr/include/limits.h" 1 3 4 # 144 "/usr/include/limits.h" 3 4 # 1 "/usr/include/bits/posix1_lim.h" 1 3 4 # 126 "/usr/include/bits/posix1_lim.h" 3 4 # 1 "/usr/include/bits/local_lim.h" 1 3 4 # 36 "/usr/include/bits/local_lim.h" 3 4 # 1 "/usr/include/linux/limits.h" 1 3 4 # 37 "/usr/include/bits/local_lim.h" 2 3 4 # 127 "/usr/include/bits/posix1_lim.h" 2 3 4 # 145 "/usr/include/limits.h" 2 3 4 # 1 "/usr/include/bits/posix2_lim.h" 1 3 4 # 149 "/usr/include/limits.h" 2 3 4 # 123 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/limits.h" 2 3 4 # 8 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/syslimits.h" 2 3 4 # 12 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/limits.h" 2 3 4 # 32 "/usr/include/bits/socket.h" 2 3 4 # 1 "/usr/include/sys/types.h" 1 3 4 # 29 "/usr/include/sys/types.h" 3 4 typedef __u_char u_char; typedef __u_short u_short; typedef __u_int u_int; typedef __u_long u_long; typedef __quad_t quad_t; typedef __u_quad_t u_quad_t; typedef __fsid_t fsid_t; typedef __loff_t loff_t; typedef __ino_t ino_t; # 62 "/usr/include/sys/types.h" 3 4 typedef __dev_t dev_t; typedef __gid_t gid_t; typedef __mode_t mode_t; typedef __nlink_t nlink_t; typedef __uid_t uid_t; typedef __off_t off_t; # 100 "/usr/include/sys/types.h" 3 4 typedef __pid_t pid_t; typedef __id_t id_t; typedef __ssize_t ssize_t; typedef __daddr_t daddr_t; typedef __caddr_t caddr_t; typedef __key_t key_t; # 133 "/usr/include/sys/types.h" 3 4 # 1 "/usr/include/time.h" 1 3 4 # 74 "/usr/include/time.h" 3 4 typedef __time_t time_t; # 92 "/usr/include/time.h" 3 4 typedef __clockid_t clockid_t; # 104 "/usr/include/time.h" 3 4 typedef __timer_t timer_t; # 134 "/usr/include/sys/types.h" 2 3 4 # 147 "/usr/include/sys/types.h" 3 4 # 1 "/usr/lib/gcc-lib/i386-linux/3.3.1/include/stddef.h" 1 3 4 # 148 "/usr/include/sys/types.h" 2 3 4 typedef unsigned long int ulong; typedef unsigned short int ushort; typedef unsigned int uint; # 197 "/usr/include/sys/types.h" 3 4 typedef unsigned int u_int8_t __attribute__ ((__mode__ (__QI__))); typedef unsigned int u_int16_t __attribute__ ((__mode__ (__HI__))); typedef unsigned int u_int32_t __attribute__ ((__mode__ (__SI__))); typedef unsigned int u_int64_t __attribute__ ((__mode__ (__DI__))); typedef int register_t __attribute__ ((__mode__ (__word__))); # 213 "/usr/include/sys/types.h" 3 4 # 1 "/usr/include/endian.h" 1 3 4 # 37 "/usr/include/endian.h" 3 4 # 1 "/usr/include/bits/endian.h" 1 3 4 # 38 "/usr/include/endian.h" 2 3 4 # 214 "/usr/include/sys/types.h" 2 3 4 # 1 "/usr/include/sys/select.h" 1 3 4 # 31 "/usr/include/sys/select.h" 3 4 # 1 "/usr/include/bits/select.h" 1 3 4 # 32 "/usr/include/sys/select.h" 2 3 4 # 1 "/usr/include/bits/sigset.h" 1 3 4 # 23 "/usr/include/bits/sigset.h" 3 4 typedef int __sig_atomic_t; typedef struct { unsigned long int __val[(1024 / (8 * sizeof (unsigned long int)))]; } __sigset_t; # 35 "/usr/include/sys/select.h" 2 3 4 typedef __sigset_t sigset_t; # 1 "/usr/include/time.h" 1 3 4 # 116 "/usr/include/time.h" 3 4 struct timespec { __time_t tv_sec; long int tv_nsec; }; # 45 "/usr/include/sys/select.h" 2 3 4 # 1 "/usr/include/bits/time.h" 1 3 4 # 67 "/usr/include/bits/time.h" 3 4 struct timeval { __time_t tv_sec; __suseconds_t tv_usec; }; # 47 "/usr/include/sys/select.h" 2 3 4 typedef __suseconds_t suseconds_t; typedef long int __fd_mask; # 67 "/usr/include/sys/select.h" 3 4 typedef struct { __fd_mask __fds_bits[1024 / (8 * sizeof (__fd_mask))]; } fd_set; typedef __fd_mask fd_mask; # 99 "/usr/include/sys/select.h" 3 4 extern int select (int __nfds, fd_set *__restrict __readfds, fd_set *__restrict __writefds, fd_set *__restrict __exceptfds, struct timeval *__restrict __timeout) ; # 122 "/usr/include/sys/select.h" 3 4 # 217 "/usr/include/sys/types.h" 2 3 4 # 1 "/usr/include/sys/sysmacros.h" 1 3 4 # 220 "/usr/include/sys/types.h" 2 3 4 # 231 "/usr/include/sys/types.h" 3 4 typedef __blkcnt_t blkcnt_t; typedef __fsblkcnt_t fsblkcnt_t; typedef __fsfilcnt_t fsfilcnt_t; # 266 "/usr/include/sys/types.h" 3 4 # 1 "/usr/include/bits/pthreadtypes.h" 1 3 4 # 23 "/usr/include/bits/pthreadtypes.h" 3 4 # 1 "/usr/include/bits/sched.h" 1 3 4 # 83 "/usr/include/bits/sched.h" 3 4 struct __sched_param { int __sched_priority; }; # 24 "/usr/include/bits/pthreadtypes.h" 2 3 4 typedef int __atomic_lock_t; struct _pthread_fastlock { long int __status; __atomic_lock_t __spinlock; }; typedef struct _pthread_descr_struct *_pthread_descr; typedef struct __pthread_attr_s { int __detachstate; int __schedpolicy; struct __sched_param __schedparam; int __inheritsched; int __scope; size_t __guardsize; int __stackaddr_set; void *__stackaddr; size_t __stacksize; } pthread_attr_t; typedef struct { struct _pthread_fastlock __c_lock; _pthread_descr __c_waiting; } pthread_cond_t; typedef struct { int __dummy; } pthread_condattr_t; typedef unsigned int pthread_key_t; typedef struct { int __m_reserved; int __m_count; _pthread_descr __m_owner; int __m_kind; struct _pthread_fastlock __m_lock; } pthread_mutex_t; typedef struct { int __mutexkind; } pthread_mutexattr_t; typedef int pthread_once_t; # 142 "/usr/include/bits/pthreadtypes.h" 3 4 typedef unsigned long int pthread_t; # 267 "/usr/include/sys/types.h" 2 3 4 # 33 "/usr/include/bits/socket.h" 2 3 4 typedef __socklen_t socklen_t; enum __socket_type { SOCK_STREAM = 1, SOCK_DGRAM = 2, SOCK_RAW = 3, SOCK_RDM = 4, SOCK_SEQPACKET = 5, SOCK_PACKET = 10 }; # 142 "/usr/include/bits/socket.h" 3 4 # 1 "/usr/include/bits/sockaddr.h" 1 3 4 # 29 "/usr/include/bits/sockaddr.h" 3 4 typedef unsigned short int sa_family_t; # 143 "/usr/include/bits/socket.h" 2 3 4 struct sockaddr { sa_family_t sa_family; char sa_data[14]; }; # 162 "/usr/include/bits/socket.h" 3 4 struct sockaddr_storage { sa_family_t ss_family; __uint32_t __ss_align; char __ss_padding[(128 - (2 * sizeof (__uint32_t)))]; }; enum { MSG_OOB = 0x01, MSG_PEEK = 0x02, MSG_DONTROUTE = 0x04, MSG_CTRUNC = 0x08, MSG_PROXY = 0x10, MSG_TRUNC = 0x20, MSG_DONTWAIT = 0x40, MSG_EOR = 0x80, MSG_WAITALL = 0x100, MSG_FIN = 0x200, MSG_SYN = 0x400, MSG_CONFIRM = 0x800, MSG_RST = 0x1000, MSG_ERRQUEUE = 0x2000, MSG_NOSIGNAL = 0x4000, MSG_MORE = 0x8000 }; struct msghdr { void *msg_name; socklen_t msg_namelen; struct iovec *msg_iov; size_t msg_iovlen; void *msg_control; size_t msg_controllen; int msg_flags; }; struct cmsghdr { size_t cmsg_len; int cmsg_level; int cmsg_type; __extension__ unsigned char __cmsg_data []; }; # 257 "/usr/include/bits/socket.h" 3 4 extern struct cmsghdr *__cmsg_nxthdr (struct msghdr *__mhdr, struct cmsghdr *__cmsg) ; # 284 "/usr/include/bits/socket.h" 3 4 enum { SCM_RIGHTS = 0x01, SCM_CREDENTIALS = 0x02, __SCM_CONNECT = 0x03 }; struct ucred { pid_t pid; uid_t uid; gid_t gid; }; # 1 "/usr/include/asm/socket.h" 1 3 4 # 1 "/usr/include/asm/sockios.h" 1 3 4 # 5 "/usr/include/asm/socket.h" 2 3 4 # 306 "/usr/include/bits/socket.h" 2 3 4 struct linger { int l_onoff; int l_linger; }; # 213 "/usr/include/netinet/in.h" 2 3 4 struct sockaddr_in { sa_family_t sin_family; in_port_t sin_port; struct in_addr sin_addr; unsigned char sin_zero[sizeof (struct sockaddr) - (sizeof (unsigned short int)) - sizeof (in_port_t) - sizeof (struct in_addr)]; }; struct sockaddr_in6 { sa_family_t sin6_family; in_port_t sin6_port; uint32_t sin6_flowinfo; struct in6_addr sin6_addr; uint32_t sin6_scope_id; }; struct ipv6_mreq { struct in6_addr ipv6mr_multiaddr; unsigned int ipv6mr_interface; }; # 1 "/usr/include/bits/in.h" 1 3 4 # 66 "/usr/include/bits/in.h" 3 4 struct ip_opts { struct in_addr ip_dst; char ip_opts[40]; }; struct ip_mreq { struct in_addr imr_multiaddr; struct in_addr imr_interface; }; struct ip_mreqn { struct in_addr imr_multiaddr; struct in_addr imr_address; int imr_ifindex; }; struct in_pktinfo { int ipi_ifindex; struct in_addr ipi_spec_dst; struct in_addr ipi_addr; }; # 251 "/usr/include/netinet/in.h" 2 3 4 # 259 "/usr/include/netinet/in.h" 3 4 extern uint32_t ntohl (uint32_t __netlong) __attribute__ ((__const__)); extern uint16_t ntohs (uint16_t __netshort) __attribute__ ((__const__)); extern uint32_t htonl (uint32_t __hostlong) __attribute__ ((__const__)); extern uint16_t htons (uint16_t __hostshort) __attribute__ ((__const__)); # 1 "/usr/include/bits/byteswap.h" 1 3 4 # 271 "/usr/include/netinet/in.h" 2 3 4 # 333 "/usr/include/netinet/in.h" 3 4 extern int bindresvport (int __sockfd, struct sockaddr_in *__sock_in) ; extern int bindresvport6 (int __sockfd, struct sockaddr_in6 *__sock_in) ; # 361 "/usr/include/netinet/in.h" 3 4 struct in6_pktinfo { struct in6_addr ipi6_addr; unsigned int ipi6_ifindex; }; # 2 "b.c" 2 int main(struct sockaddr *fromp, int port) { const int family = fromp->sa_family; union { struct sockaddr_in6 in6; struct sockaddr_in in; } *const u = (void *)fromp; if (family == 10) u->in6.sin6_port = htons(port); else u->in.sin_port = htons(port); return 0; }