[Bug tree-optimization/83081] [8 regression][arm] gcc.dg/pr80218.c fails since r254888

["aldyh at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83081

Aldy Hernandez <aldyh at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2017-12-19
                 CC|                            |aldyh at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
I can't reproduce with a hacked up cross, so I may be missing something.

Could the original reporter verify this is still an issue?

For the record, this is how I am trying to reproduce:

~/src/gcc/configure --enable-languages=c,c++ --disable-bootstrap
--disable-multilib --target=arm-none-linux-gnueabi

"Preprocessed" source:

tor:~/bld/t/gcc$ cat pr80218.c
/* { dg-options "-O2 -fdump-rtl-ira-details-blocks" } */
/* { dg-require-effective-target c99_runtime } */

//#include <math.h>
extern float sqrtf (float __x) __attribute__ ((__nothrow__ , __leaf__));
extern float acosf (float __x) __attribute__ ((__nothrow__ , __leaf__));

void foo (float *);

void
f1 (float *x)
{
  x[0] = sqrtf (x[0]);
}

void
f2 (float *x)
{
  sqrtf (x[0]);
  foo (x);
}

void
f3 (float *x)
{
  acosf (x[0]);
  foo (x);
}

/* { dg-final { scan-rtl-dump-not "Invalid sum" "ira" } } */

tor:~/bld/t/gcc$ ./cc1  pr80218.c  -quiet -O2 -fdump-rtl-ira-details-blocks
-I/tmp
terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_M_construct null not valid
during RTL pass: final
pr80218.c: In function ‘f1’:
pr80218.c:14:1: internal compiler error: Aborted

I am ignoring the above ICE, as it's probably unrelated and happens past the
IRA pass the test cares about:

tor:~/bld/t/gcc$ grep Invalid.sum  pr80218.c.275r.ira 
tor:~/bld/t/gcc$