[Bug inline-asm/85030] [6/7/8 Regression] internal compiler error: Floating point exception (validate_subreg())

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85030

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P2
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-03-22
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |vmakarov at gcc dot gnu.org
   Target Milestone|---                         |6.5
            Summary|internal compiler error:    |[6/7/8 Regression] internal
                   |Floating point exception    |compiler error: Floating
                   |(validate_subreg())         |point exception
                   |                            |(validate_subreg())
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r192719 - the introduction of LRA.
Reload would reject it with:
pr85030.c: In function ‘foo’:
pr85030.c:7:3: error: ‘asm’ operand constraint incompatible with operand size
   asm volatile ("" : "=rm" (a) : "0" (1));
   ^
pr85030.c:7:3: error: ‘asm’ operand has impossible constraints

Slightly adjusted testcase:
struct S { int c, *b, *e; };

void
foo ()
{
  struct S a;
  asm volatile ("" : "=rm" (a) : "0" (1));
}