[Bug target/47540] New: ARM THUMB crash with complex numbers

[ian at airs dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47540

           Summary: ARM THUMB crash with complex numbers
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ian@airs.com


When I compile this C code with -O2 -mthumb on a current mainline compiler
configured for arm-rtems4.11, it crashes.

extern double f1 (_Complex double);
extern _Complex double f2 (_Complex double);
_Complex double f (_Complex double x) { return f1 (x) == 0 ? 0 : f2 (x); }


> gcc/xgcc -Bgcc/ -c -O2 -mthumb foo.c
foo.c: In function 'f':
foo.c:3:1: internal compiler error: in find_valid_class, at reload.c:710
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

The error is the gcc_assert at the end of find_valid_class.

This code compiles OK on x86 and on ARM when not using -mthumb.