From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 17519 invoked by alias); 7 Oct 2002 15:06:00 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 17499 invoked by uid 71); 7 Oct 2002 15:06:00 -0000 Resent-Date: 7 Oct 2002 15:06:00 -0000 Resent-Message-ID: <20021007150600.17498.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, trauscher@loytec.com Received: (qmail 15571 invoked from network); 7 Oct 2002 14:56:02 -0000 Received: from unknown (HELO lexx.office.loytec.com) (212.17.86.176) by sources.redhat.com with SMTP; 7 Oct 2002 14:56:02 -0000 Received: (from trausche@localhost) by lexx.office.loytec.com (8.11.0/8.11.0/Some OS 1.2.3-4.5) id g97Etve24693; Mon, 7 Oct 2002 16:55:57 +0200 Message-Id: <200210071455.g97Etve24693@lexx.office.loytec.com> Date: Mon, 07 Oct 2002 08:06:00 -0000 From: trauscher@loytec.com To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version: 3.113 Subject: target/8159: ARM/THUMB code uses sp as index register for automatic arrays X-SW-Source: 2002-10/txt/msg00255.txt.bz2 List-Id: >Number: 8159 >Category: target >Synopsis: ARM/THUMB code uses sp as index register for automatic arrays >Confidential: no >Severity: serious >Priority: low >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Mon Oct 07 08:06:00 PDT 2002 >Closed-Date: >Last-Modified: >Originator: Thomas Rauscher >Release: 3.2 >Organization: LOYTEC electronics GmbH >Environment: System: Linux lexx 2.2.19 #3 Mon Nov 5 10:25:49 CET 2001 i686 unknown Architecture: i686 host: i686-pc-linux-gnu build: i686-pc-linux-gnu target: arm-rtems-elf configured with: ./configure --target=arm-rtems-elf --prefix=/usr/local --enable-languages=c,c++ --with-newlib >Description: The compiler sometimes uses "sp" as index register for loading/storing automatic arrays. Optimization must be enabled for the problem to appear. >How-To-Repeat: Edit the following file (x.c) int f(int n) { int a[1]; return a[n]; } Running the compiler yields: arm-rtems-elf-gcc -v -c -O1 -save-temps -mthumb x.c Reading specs from /usr/local/lib/gcc-lib/arm-rtems-elf/3.2/specs Configured with: /tmp/arm/gcc-3.2/configure --target=arm-rtems-elf --prefix=/usr/local --enable-languages=c,c++ --with-newlib Thread model: single gcc version 3.2 /usr/local/lib/gcc-lib/arm-rtems-elf/3.2/cpp0 -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=0 -D__GXX_ABI_VERSION=102 -D__ELF__ -D__ELF__ -D__OPTIMIZE__ -D__STDC_HOSTED__=1 -Acpu=arm -Amachine=arm -D__ARM_ARCH_4T__ -D__APCS_32__ -D__ARMEL__ -D__THUMBEL__ -D__ELF__ -D__USES_INITFINI__ -D__thumb__ x.c x.i GNU CPP version 3.2 (cpplib) (ARM/ELF) ignoring nonexistent directory "/usr/local/arm-rtems-elf/sys-include" #include "..." search starts here: #include <...> search starts here: /usr/local/lib/gcc-lib/arm-rtems-elf/3.2/include /usr/local/arm-rtems-elf/include End of search list. /usr/local/lib/gcc-lib/arm-rtems-elf/3.2/cc1 -fpreprocessed x.i -quiet -dumpbase x.c -mthumb -O1 -version -o x.s GNU CPP version 3.2 (cpplib) (ARM/ELF) GNU C version 3.2 (arm-rtems-elf) compiled by GNU C version 2.95.2 19991024 (release). /usr/local/lib/gcc-lib/arm-rtems-elf/3.2/../../../../arm-rtems-elf/bin/as -mno-fpu -o x.o x.s x.s: Assembler messages: x.s:12: Error: lo register required -- `ldr r0,[r0,sp]' The wrong assembly output is: .file "x.c" .text .align 2 .global f .thumb_func .type f,function f: sub sp, sp, #4 lsl r0, r0, #2 ldr r0, [r0, sp] !!!!! This instruction fails to assemble add sp, sp, #4 @ sp needed for prologue bx lr .Lfe1: .size f,.Lfe1-f .ident "GCC: (GNU) 3.2" >Fix: None known. >Release-Note: >Audit-Trail: >Unformatted: