http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53485
Bug #: 53485
Summary: gcc -O -mavx generates illegal instruction on win64
Classification: Unclassified
Product: gcc
Version: 4.6.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: i...@nasoftware.co.uk
Created attachment 27495
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27495
preprocessed source
Compiling the attached program with optimization and AVX for Win64 generates an
illegal instruction. The same code runs correctly on Win32 and on Linux64.
$ x86_64-w64-mingw32-gcc -m64 -mavx bug.c -O -g -o bug.exe -Wall -Wextra
-save-temps
$ ./bug.exe
BUG PROGRAM START: We should get this message once.
DEBUG fun1 start...
Illegal instruction
$ gdb bug.exe
(gdb) r
Starting program: C:\cygwin\home\nas/bug.exe
[New Thread 2436.0x38c]
BUG PROGRAM START: We should get this message once.
DEBUG fun1 start...
Program received signal SIGILL, Illegal instruction.
fun1 () at bug.c:95
95 v1 = vfone;
(gdb) x/i $pc
=> 0x4015e7 <fun1+54>: vmovaps 0x7b11(%rip),%ymm0 # 0x409100
(gdb) p $rip
$1 = (void (*)()) 0x4015e7 <fun1+54>
(gdb) info frame
Stack level 0, frame at 0x22fe40:
rip = 0x4015e7 in fun1 (bug.c:95); saved rip 0x40171b
called by frame at 0x22fe70
source language c.
Arglist at 0x22fe30, args:
Locals at 0x22fe30, Previous frame's sp is 0x22fe40
Saved registers:
rbx at 0x22fe20, rsi at 0x22fe28, rbp at 0x22fe30, rip at 0x22fe38, xmm15 at
0x22fe38
$ x86_64-w64-mingw32-gcc -v
Using built-in specs.
COLLECT_GCC=C:\cygwin\home\nas\mingw64\bin\x86_64-w64-mingw32-gcc.exe
COLLECT_LTO_WRAPPER=c:/cygwin/home/nas/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/4.6.3/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: /home/drangon/work/mingw-w64-dgn/source/gcc/configure
--host=x86_64-w64-mingw32 --target=x86_64-w64-mingw32 --disable-nls
--enable-languages=c,c++,objc,obj-c++
--with-gmp=/home/drangon/work/mingw-w64-dgn/build/for_target
--enable-twoprocess --disable-libstdcxx-pch --disable-win32-registry
--prefix=/home/drangon/work/mingw-w64-dgn/target
--with-sysroot=/home/drangon/work/mingw-w64-dgn/target
Thread model: win32
gcc version 4.6.3 20120225 (prerelease) (GCC)
I have also tried the mingw64 cross compiler from
http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Automated%20Builds/
gcc version 4.8.0 20120509 (experimental) (GCC)
and I get the same error (though I need to use -O3)
If I download an older version,
gcc version 4.5.4 20111030 (prerelease) [svn/rev.180676 - mingw-w64/oz] (GCC)
then I don't get the illegal instruction.
