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From: "ams at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/50318] New: ICE optimizing widening multiply-and-accumulate
Date: Wed, 07 Sep 2011 11:08:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D50318

             Bug #: 50318
           Summary: ICE optimizing widening multiply-and-accumulate
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ams@gcc.gnu.org


The widening mulitply pass creates a bad expression when using constants wi=
th
types that don't match the other operand:

(This testcase is reduced from the Linux kernel)

long long test (unsigned int sec, unsigned long long nsecs)
{
 return (long long)(long)sec * 1000000000L + (long long)(unsigned
long)nsecs;
}

dummy.i: In function =E2=80=98test=E2=80=99:
dummy.i:2:11: error: type mismatch in widening multiply-accumulate
expression
long long int
unsigned int
long int
long long int
D.4708_8 =3D WIDEN_MULT_PLUS_EXPR <sec_1(D), 1000000000, D.4720_11>;

dummy.i:2:11: internal compiler error: verify_gimple failed