[LLVMbugs] [Bug 15351] New: Illegal instruction with -march=native

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=15351

            Bug ID: 15351
           Summary: Illegal instruction with -march=native
           Product: clang
           Version: 3.2
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: wbrana at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Pentium Sandy Bridge is misdetected as Corei7-AVX, but it doesn't support AVX.
Following code is crashing (Illegal instruction) if compiled with
-march=native, but doesn't crash with -march=native -mno-avx

int main(){
    double d1[4],d2[4];
    for(int i=0;i<4;i++) {
        d1[i]=d2[i];
    };
}

clang++ -march=native -v 1.cpp -o 1
clang version 3.2 (tags/RELEASE_32/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
 "/usr/bin/clang" -cc1 -triple x86_64-pc-linux-gnu -emit-obj -mrelax-all
-disable-free -disable-llvm-verifier -main-file-name 1.cpp -mrelocation-model
static -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases
-munwind-tables -fuse-init-array -target-cpu corei7-avx -target-linker-version
2.23.1 -momit-leaf-frame-pointer -v -resource-dir /usr/bin/../lib/clang/3.2
-fmodule-cache-path /var/tmp/clang-module-cache -internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include/g++-v4 -internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include/g++-v4/x86_64-pc-linux-gnu
-internal-isystem
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include/g++-v4/backward
-internal-isystem /usr/local/include -internal-isystem
/usr/bin/../lib/clang/3.2/include -internal-externc-isystem /include
-internal-externc-isystem /usr/include -fdeprecated-macro
-fdebug-compilation-dir /home/dev/workspace/tmp -ferror-limit 19
-fmessage-length 317 -mstackrealign -fobjc-runtime=gcc -fcxx-exceptions
-fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/1-Yymn4X.o
-x c++ 1.cpp
clang -cc1 version 3.2 based upon LLVM 3.2svn default target
x86_64-pc-linux-gnu
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include/g++-v4
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include/g++-v4/x86_64-pc-linux-gnu
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/include/g++-v4/backward
 /usr/local/include
 /usr/bin/../lib/clang/3.2/include
 /usr/include
End of search list.
 "/usr/bin/x86_64-pc-linux-gnu-ld" --eh-frame-hdr -m elf_x86_64 -dynamic-linker
/lib64/ld-linux-x86-64.so.2 -o 1
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/crtbegin.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64 -L/lib/../lib64
-L/usr/lib/../lib64
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../.. -L/lib -L/usr/lib
/tmp/1-Yymn4X.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/crtend.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.7.3/../../../../lib64/crtn.o

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