[Bug inline-asm/84680] [6/7/8 Regression] internal compiler error: Max. number of generated reload insns per insn is achieved (90)

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84680

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-03-08
                 CC|                            |msebor at gcc dot gnu.org
      Known to work|                            |4.8.4
            Summary|internal compiler error:    |[6/7/8 Regression] internal
                   |Max. number of generated    |compiler error: Max. number
                   |reload insns per insn is    |of generated reload insns
                   |achieved (90)               |per insn is achieved (90)
     Ever confirmed|0                           |1
      Known to fail|                            |4.9.3, 5.3.0, 6.1.0, 7.3.0,
                   |                            |8.0

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  Bisection points to:

r201915 (gcc 4.9.0):

r201915 | kyukhin | 2013-08-22 02:06:03 -0400 (Thu, 22 Aug 2013) | 135 lines

* common/config/i386/i386-common.c (OPTION_MASK_ISA_AVX512F_SET): New.
...

Before that, GCC would fail with:

pr84680.C: In function ‘void a()’:
pr84680.C:4:56: error: impossible constraint in ‘asm’
   asm volatile("" : "=vp" (b) : "0" (__builtin_alloca));
                                                        ^