[Bug tree-optimization/47967] New: [4.6 Regression] ICE: verify_stmts failed: conversion of register to a different size with -fipa-cp on undefined code

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47967

           Summary: [4.6 Regression] ICE: verify_stmts failed: conversion
                    of register to a different size with -fipa-cp on
                    undefined code
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 23526
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23526
reduced testcase

$ gcc testcase.c -O -fipa-cp
testcase.c: In function 'bar.constprop.0':
testcase.c:10:1: error: conversion of register to a different size
VIEW_CONVERT_EXPR<double>(D.2694_2);

i_1 = VIEW_CONVERT_EXPR<double>(D.2694_2);

testcase.c:10:1: internal compiler error: verify_stmts failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.


Tested revisions:
r170622 - crash
4.5 r170013 - OK
4.4 r170013 - OK