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From: "gressau at optusnet dot com dot au" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/33111] New: Bad code generation with -O2 (ARM 7 architecture) Date: Sun, 19 Aug 2007 07:49:00 -0000 [thread overview] Message-ID: <bug-33111-14993@http.gcc.gnu.org/bugzilla/> (raw) #define UIP_LLH_LEN 10000 #define BUF ((uip_tcpip_hdr *)&uip_buf[UIP_LLH_LEN]) #define u8_t unsigned char #define u16_t unsigned short #define UIP_BUFSIZE 1000 typedef struct { /* IP header. */ u8_t vhl, tos, len[2], ipid[2], ipoffset[2], ttl, proto; u16_t ipchksum; u16_t srcipaddr[2], destipaddr[2]; /* TCP header. */ u16_t srcport, destport; u8_t seqno[4], ackno[4], tcpoffset, flags, wnd[2]; u16_t tcpchksum; u8_t urgp[2]; u8_t optdata[4]; } uip_tcpip_hdr; u8_t uip_buf[UIP_BUFSIZE+2]; volatile u8_t uip_acc32[4]; int jaroslav; int main(void) { if((BUF->ackno[0] == uip_acc32[0]) && (BUF->ackno[1] == uip_acc32[1]) && (BUF->ackno[2] == uip_acc32[2]) && (BUF->ackno[3] == uip_acc32[3])) jaroslav++; return 1; } .file "main.c" .text .align 2 .global main .type main, %function main: @ args = 0, pretend = 0, frame = 0 @ frame_needed = 0, uses_anonymous_args = 0 @ link register save eliminated. ldr r0, .L10 ldr r1, .L10+4 ldrb r2, [r0, #28] @ zero_extendqisi2 ldrb r3, [r1, #0] @ zero_extendqisi2 cmp r2, r3 @ lr needed for prologue beq .L9 .L2: mov r0, #1 bx lr .L9: ldrb r2, [r1, #1] @ zero_extendqisi2 ldrb r3, [r0, #29] @ zero_extendqisi2 cmp r3, r2 bne .L2 ldrb r2, [r1, #2] @ zero_extendqisi2 ldrb r3, [r0, #30] @ zero_extendqisi2 cmp r3, r2 bne .L2 ldrb r2, [r1, #3] @ zero_extendqisi2 ldrb r3, [r0, #31] @ zero_extendqisi2 cmp r3, r2 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!I THINK CC's OF THIS COMPARE NEVER GET LOOKED AT ldreq r2, .L10+8 ldreq r3, [r2, #0] addeq r3, r3, #1 streq r3, [r2, #0] b .L2 .L11: .align 2 .L10: .word uip_buf+10000 .word uip_acc32 .word jaroslav .size main, .-main .comm uip_buf,1002,1 .comm uip_acc32,4,1 .comm jaroslav,4,4 .ident "GCC: (GNU) 4.2.0" -- Summary: Bad code generation with -O2 (ARM 7 architecture) Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: gressau at optusnet dot com dot au http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33111
next reply other threads:[~2007-08-19 7:49 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2007-08-19 7:49 gressau at optusnet dot com dot au [this message] 2007-08-19 8:59 ` [Bug c/33111] " pinskia at gcc dot gnu dot org 2007-08-19 13:24 ` gressau at optusnet dot com dot au 2007-08-19 22:23 ` gressau at optusnet dot com dot au 2007-08-19 22:24 ` gressau at optusnet dot com dot au 2007-08-19 22:25 ` gressau at optusnet dot com dot au 2007-09-09 20:44 ` gressau at optusnet dot com dot au 2007-09-09 21:08 ` rask at gcc dot gnu dot org 2007-09-09 22:23 ` gressau at optusnet dot com dot au 2008-12-27 6:54 ` [Bug target/33111] " pinskia at gcc dot gnu dot org 2009-05-22 14:51 ` rearnsha at gcc dot gnu dot org
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