From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 31577 invoked by alias); 26 Jun 2002 01:16:08 -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 31521 invoked by uid 71); 26 Jun 2002 01:16:04 -0000 Resent-Date: 26 Jun 2002 01:16:04 -0000 Resent-Message-ID: <20020626011604.31520.qmail@sources.redhat.com> Resent-From: gcc-gnats@gcc.gnu.org (GNATS Filer) Resent-To: nobody@gcc.gnu.org Resent-Cc: gcc-prs@gcc.gnu.org, gcc-bugs@gcc.gnu.org Resent-Reply-To: gcc-gnats@gcc.gnu.org, yozo@cs.berkeley.edu Received: (qmail 29466 invoked by uid 61); 26 Jun 2002 01:09:12 -0000 Message-Id: <20020626010912.29465.qmail@sources.redhat.com> Date: Tue, 25 Jun 2002 19:26:00 -0000 From: yozo@cs.berkeley.edu Reply-To: yozo@cs.berkeley.edu To: gcc-gnats@gcc.gnu.org X-Send-Pr-Version: gnatsweb-2.9.3 (1.1.1.1.2.31) Subject: optimization/7130: miscompiled code for gcc-3.1 in powerpc linux with -funroll-all-loops X-SW-Source: 2002-06/txt/msg00621.txt.bz2 List-Id: >Number: 7130 >Category: optimization >Synopsis: miscompiled code for gcc-3.1 in powerpc linux with -funroll-all-loops >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Tue Jun 25 18:16:02 PDT 2002 >Closed-Date: >Last-Modified: >Originator: yozo@cs.berkeley.edu >Release: gcc-3.1 >Organization: >Environment: powerpc-unknown-linux-gnu PowerPC 750 (G3), PowerBook G3 Series (Wallstreet), Linux-2.14.19-pre10, Glibc 2.2.5 Configured with: ../gcc-3.1/configure --prefix=/usr --enable-shared --enable-threads=posix --with-slibdir=/lib >Description: Wrong code is generated for some loops when -O3 -funroll-all-loops option is used. Attached (unroll-test_e.i) is the intermediate file generated by gcc -v -save-temps -O3 -funroll-all-loops -o unroll_test unroll-test_e.c The code performs a simple scaling of a floating-point vector. When the loop iteration is 5, 6, or 7, the only the first four iteration is done, leaving the last 1, 2, or 3 vector elements unmodified (see scale() in the source code). The output of above command is Reading specs from /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/specs Configured with: ../gcc-3.1/configure --prefix=/usr --enable-shared --enable-threads=posix --with-slibdir=/lib Thread model: posix gcc version 3.1 /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/cpp0 -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -DPPC -D__ELF__ -Dpowerpc -D__PPC__ -D__ELF__ -D__powerpc__ -D__PPC -D__powerpc -Acpu=powerpc -Amachine=powerpc -D__OPTIMIZE__ -D__STDC_HOSTED__=1 -D_CALL_SYSV -D_BIG_ENDIAN -D__BIG_ENDIAN__ -Amachine=bigendian -D_ARCH_PPC -D__unix__ -D__gnu_linux__ -D__linux__ -Dunix -D__unix -Dlinux -D__linux -Asystem=unix -Asystem=posix unroll-test_e.c unroll-test_e.i GNU CPP version 3.1 (cpplib) (PowerPC GNU/Linux) ignoring nonexistent directory "/usr/powerpc-unknown-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/include /usr/include End of search list. /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/cc1 -fpreprocessed unroll-test_e.i -quiet -dumpbase unroll-test_e.c -O3 -version -funroll-all-loops -o unroll-test_e.s GNU CPP version 3.1 (cpplib) (PowerPC GNU/Linux) GNU C version 3.1 (powerpc-unknown-linux-gnu) compiled by GNU C version 3.1. as -mppc -V -Qy -o unroll-test_e.o unroll-test_e.s GNU assembler version 2.12.1 (powerpc-unknown-linux-gnu) using BFD version 2.12.1 /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/collect2 --eh-frame-hdr -V -Qy -m elf32ppclinux -dynamic-linker /lib/ld.so.1 -o unroll_test /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/../../../crt1.o /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/../../../crti.o /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/crtbegin.o -L/usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1 -L/usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/../../.. unroll-test_e.o -lgcc -lgcc_eh -lc -lgcc -lgcc_eh /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/crtsavres.o /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/crtend.o /usr/lib/gcc-lib/powerpc-unknown-linux-gnu/3.1/../../../crtn.o GNU ld version 2.12.1 Supported emulations: elf32ppclinux elf32ppc elf32ppcsim The problem was discovered while compiling atlas-3.4.1. -Yozo >How-To-Repeat: Compile the source file with gcc -O3 -funroll-all-loops -o unroll_test unroll_test_e.c Run the program with ./unroll_test Notice the element x[9] is not changed even though it is supposed to be multiplied by two. >Fix: Don't use "-funroll-all-loops". >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: application/octet-stream; name="unroll-test_e.i" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="unroll-test_e.i" IyAxICJ1bnJvbGwtdGVzdF9lLmMiCiMgMSAiPGJ1aWx0LWluPiIKIyAxICI8Y29tbWFuZCBsaW5l PiIKIyAxICJ1bnJvbGwtdGVzdF9lLmMiCiMgMSAiL3Vzci9saWIvZ2NjLWxpYi9wb3dlcnBjLXVu a25vd24tbGludXgtZ251LzMuMS9pbmNsdWRlL3N0ZGlvLmgiIDEgMwojIDM3ICIvdXNyL2xpYi9n 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