[Bug middle-end/79407] -fcall-saved-rax flag causes an internal segmentation fault

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79407

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|                            |x86_64-*-*
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-02-07
          Component|c++                         |middle-end
     Ever confirmed|0                           |1
      Known to fail|                            |7.0.1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed on trunk:

Program received signal SIGSEGV, Segmentation fault.
0x0000000000bc2d08 in expand_call (exp=<call_expr 0x7ffff68b03f0>, target=0x0, 
    ignore=0) at /space/rguenther/src/svn/gcc-7-branch/gcc/calls.c:3973
3973              rtx temp = gen_reg_rtx (GET_MODE (valreg));
(gdb) p valreg
$1 = (rtx) 0x0


I suppose this falls under the "don't do that" category of bugs though.