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From: Andreas Schwab <schwab@suse.de> To: gcc-gnats@gcc.gnu.org Subject: optimization/6534: Miscompiled expr from sh-utils on ia64 Date: Wed, 01 May 2002 11:26:00 -0000 [thread overview] Message-ID: <200205011825.g41IPm8k025393@sykes.suse.de> (raw) >Number: 6534 >Category: optimization >Synopsis: Miscompiled expr from sh-utils on ia64 >Confidential: no >Severity: critical >Priority: medium >Responsible: unassigned >State: open >Class: wrong-code >Submitter-Id: net >Arrival-Date: Wed May 01 11:26:00 PDT 2002 >Closed-Date: >Last-Modified: >Originator: >Release: 3.1 20020429 (prerelease) >Organization: >Environment: System: Linux sykes 2.4.18-SMP #1 SMP Sat Apr 13 18:56:25 UTC 2002 ia64 unknown Architecture: ia64 host: ia64-suse-linux-gnu build: ia64-suse-linux-gnu target: ia64-suse-linux-gnu configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib --enable-languages=c,c++,f77,objc,java,ada --with-gxx-include-dir=/usr/include/g++ --with-slibdir=/lib --with-system-zlib --enable-shared --enable-checking ia64-suse-linux >Description: Miscompiled code at -O2. Example comes from sh-utils-2.0.12:expr.c. inttostr: .prologue .body .mlx adds r8 = 127, r33 movl r14 = -3689348814741910323 .mmi cmp.le p6, p7 = r0, r32 ;; setf.sig f6 = r14 (p7) sub r32 = r0, r32 ;; .mii st1 [r8] = r0 cmp.le p8, p9 = r0, r32 <--- r32 alread negated nop.i 0 .L3: .pred.rel.mutex p8, p9 >How-To-Repeat: $ cat inttostr.c void abort (void); static char * inttostr (long i, char buf[128]) { unsigned long ui = i; char *p = buf + 127; *p = '\0'; if (i < 0) ui = -ui; do *--p = '0' + ui % 10; while ((ui /= 10) != 0); if (i < 0) *--p = '-'; return p; } int main () { char buf[128], *p; p = inttostr (-1, buf); if (*p != '-') abort (); return 0; } $ gcc -v -O2 inttostr.c -o inttostr Reading specs from /usr/lib/gcc-lib/ia64-suse-linux/3.1/specs Configured with: ../configure --enable-threads=posix --prefix=/usr --with-local-prefix=/usr/local --infodir=/usr/share/info --mandir=/usr/share/man --libdir=/usr/lib --enable-languages=c,c++,f77,objc,java,ada --with-gxx-include-dir=/usr/include/g++ --with-slibdir=/lib --with-system-zlib --enable-shared --enable-checking ia64-suse-linux Thread model: posix gcc version 3.1 20020429 (prerelease) /usr/lib/gcc-lib/ia64-suse-linux/3.1/cc1 -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=1 -D__GNUC_PATCHLEVEL__=0 -D__gnu_linux__ -D__linux -D__linux__ -D_LONGLONG -Dlinux -Dunix -D__gnu_linux__ -D__linux -D__linux__ -D_LONGLONG -D__linux__ -D__unix__ -D__linux -D__unix -Asystem=linux -D__OPTIMIZE__ -D__STDC_HOSTED__=1 -Acpu=ia64 -Amachine=ia64 -D__ia64 -D__ia64__ -D_LP64 -D__LP64__ -D__ELF__ -D__LONG_MAX__=9223372036854775807L inttostr.c -quiet -dumpbase inttostr.c -O2 -version -o /tmp/ccEHmqPC.s GNU CPP version 3.1 20020429 (prerelease) (cpplib) (IA-64) Linux GNU C version 3.1 20020429 (prerelease) (ia64-suse-linux) compiled by GNU C version 3.1 20020429 (prerelease). #include "..." search starts here: #include <...> search starts here: /usr/local/include /usr/lib/gcc-lib/ia64-suse-linux/3.1/include /usr/ia64-suse-linux/include /usr/include End of search list. /usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../../ia64-suse-linux/bin/as -x -o /tmp/cceo8stm.o /tmp/ccEHmqPC.s /usr/lib/gcc-lib/ia64-suse-linux/3.1/collect2 -dynamic-linker /lib/ld-linux-ia64.so.2 -o inttostr /usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../crt1.o /usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../crti.o /usr/lib/gcc-lib/ia64-suse-linux/3.1/crtbegin.o -L/usr/lib/gcc-lib/ia64-suse-linux/3.1 -L/usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../../ia64-suse-linux/lib -L/usr/lib/gcc-lib/ia64-suse-linux/3.1/../../.. /tmp/cceo8stm.o -lgcc -lgcc_eh -lc -lgcc -lgcc_eh /usr/lib/gcc-lib/ia64-suse-linux/3.1/crtend.o /usr/lib/gcc-lib/ia64-suse-linux/3.1/../../../crtn.o $ ./inttostr Aborted >Fix: >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2002-05-01 18:26 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-05-01 11:26 Andreas Schwab [this message] 2002-05-01 14:48 rth 2002-05-03 13:30 rth
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