[Bug c++/32912] New: [Regression] ICE with C99 compound literal expression

["scovich at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Compiling the test case below gives the following ICE:

> bug.C: In function 'void bar()':
> bug.C:30: internal compiler error: in build_int_cst_wide, at tree.c:890
> Please submit a full bug report,

I think this might be related to bug 20103, except that gcc-4.1 handles the
test case just fine. The test case also compiles in 4.3 with -O{0,1,s} instead
of -O{2,3}. -ftree-pre is the culprit flag -- removing it from -O2 or adding it
to -O1 toggles the bug.

// g++-4.3-20070716 -msse3 -O2 bug.C
#include <emmintrin.h>

// Must be a vector, not a scalar                                               
#if 0
typedef long v2d;
#else
typedef __m128i v2d;
#endif

v2d rval();
v2d g;
struct A { // Must have 2+ members                                              
   v2d a;
   v2d b;
};
struct B { // Need a struct containing an A                                     
   A a;
};
struct C {
   operator A() {
      v2d l;
      A a;
      // Must compute (a ^ ~b). Neither (a ^ b) nor (a + ~b) breaks.            
      a.a ^= ~a.b; // globals, locals, and rvals don't break                    
      a.a ^= ~(v2d) {0,0}; // members and compound literals do                  
      return a;
   }
};
void foo(B);
void bar() {
   foo((B){C()});
}


-- 
           Summary: [Regression] ICE with C99 compound literal expression
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: scovich at gmail dot com
GCC target triplet: x86_64-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32912