https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63231
Bug ID: 63231
Summary: value stored in register %eax overwritten by temporary
value stored in same register
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: h.vandierendonck at qub dot ac.uk
Created attachment 33475
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33475&action=edit
C++ source exposing bug
Erroneous code is generated for the attached test program as a value is moved
into %eax, but %eax is subsequently overwritten with a shorter-lived temporary.
This error was observer when compiling for the k1om target (Intel MIC / Xeon
Phi). Apologies if I am addressing the wrong crowd.
The error occurs at optimisation level -O0, but not at higher optimisation
levels:
#
/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/libexec/k1om-mpss-linux/gcc/k1om-mpss-linux/4.7.0/gcc
-O0 -S -o sdi.S sdi.c
# gcc -v:
Using built-in specs.
COLLECT_GCC=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/libexec/k1om-mpss-linux/gcc/k1om-mpss-linux/4.7.0/gcc
COLLECT_LTO_WRAPPER=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/libexec/k1om-mpss-linux/gcc/k1om-mpss-linux/4.7.0/lto-wrapper
Target: k1om-mpss-linux
Configured with:
/sandbox/build/tmp/tmp/work/x86_64-nativesdk-mpsssdk-linux/gcc-cross-canadian-k1om-4.7.0+mpss3.2.1-1/gcc-4.7.0+mpss3.2.1/configure
--build=x86_64-linux --host=x86_64-mpsssdk-linux --target=k1om-mpss-linux
--prefix=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr
--exec_prefix=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr
--bindir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/bin/k1om-mpss-linux
--sbindir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/bin/k1om-mpss-linux
--libexecdir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/libexec/k1om-mpss-linux
--datadir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/share
--sysconfdir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/etc
--sharedstatedir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/com
--localstatedir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/var
--libdir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/lib/k1om-mpss-linux
--includedir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/include
--oldincludedir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/include
--infodir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/share/info
--mandir=/opt/mpss/3.2.1/sysroots/x86_64-mpsssdk-linux/usr/share/man
--disable-silent-rules --disable-dependency-tracking
--with-libtool-sysroot=/sandbox/build/tmp/tmp/sysroots/x86_64-nativesdk-mpsssdk-linux
--with-gnu-ld --enable-shared --enable-languages=c,c++ --enable-threads=posix
--disable-multilib --enable-c99 --enable-long-long --enable-symvers=gnu
--enable-libstdcxx-pch --program-prefix=k1om-mpss-linux-
--enable-target-optspace --enable-lto --enable-libssp --disable-bootstrap
--disable-libgomp --disable-libmudflap --with-system-zlib
--with-linker-hash-style=gnu --enable-cheaders=c_global
--with-local-prefix=/opt/mpss/3.2.1/sysroots/k1om-mpss-linux/usr
--with-gxx-include-dir=/opt/mpss/3.2.1/sysroots/k1om-mpss-linux/usr/include/c++
--with-build-time-tools=/sandbox/build/tmp/tmp/sysroots/x86_64-linux/usr/k1om-mpss-linux/bin
--with-sysroot=/opt/mpss/3.2.1/sysroots/k1om-mpss-linux
--with-build-sysroot=/sandbox/build/tmp/tmp/sysroots/knightscorner
--disable-libunwind-exceptions --disable-libssp --disable-libgomp
--disable-libmudflap
--with-mpfr=/sandbox/build/tmp/tmp/sysroots/x86_64-nativesdk-mpsssdk-linux
--with-mpc=/sandbox/build/tmp/tmp/sysroots/x86_64-nativesdk-mpsssdk-linux
--enable-nls --enable-__cxa_atexit
Thread model: posix
gcc version 4.7.0 20110509 (experimental) (GCC)
