[Bug target/53399] "*ffs" pattern generates wrong code with BMI enabled (for corner cases)

[kirill.yukhin at intel dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53399

--- Comment #5 from Yukhin Kirill <kirill.yukhin at intel dot com> 2012-05-20 15:54:08 UTC ---
> 
> Can you please isolate failing test?

Sure, it is attached.
It works when compiled this way:
/export/home/kyukhin/gcc/build/build-x86_64-linux/gcc/xgcc
-B/export/home/kyukhin/gcc/build/build-x86_64-linux/gcc/ 1.c -march=core2

And fails to run (on BMI*- capable HW) when compiled this way:
/export/home/kyukhin/gcc/build/build-x86_64-linux/gcc/xgcc
-B/export/home/kyukhin/gcc/build/build-x86_64-linux/gcc/ 1.c -march=core-avx2