[Bug rtl-optimization/59086] [4.9 Regression] error: ‘asm’ operand has impossible constraints

[aivchenk at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59086

--- Comment #5 from Alexander Ivchenko <aivchenk at gmail dot com> ---
I understand the technical reasons of the complexity of the correct and
efficient register allocation here, but what I don't understand is this:

$> gcc_4.7 test.c -c -fPIC -mstackrealign -march=core-avx2 -m32
$> gcc_4.8 test.c -c -fPIC -mstackrealign -march=core-avx2 -m32
$> gcc_4.9 test.c -c -fPIC -mstackrealign -march=core-avx2 -m32
test.c: In function 'testFunc':
test.c:7:3: error: 'asm' operand has impossible constraints
   __asm__(
   ^

How can we allow to break the user code with the release version of the
compiler here..?