[Bug middle-end/53823] [4.8 Regression] FAIL: gcc.c-torture/execute/930921-1.c execution at -O0 and -O1

[danglin at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53823

--- Comment #22 from John David Anglin <danglin at gcc dot gnu.org> 2012-08-12 14:30:12 UTC ---
Created attachment 27994
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27994
Patch

      /* synth_mult does an `unsigned int' multiply.  As long as the mode is
         less than or equal in size to `unsigned int' this doesn't matter.
         If the mode is larger than `unsigned int', then synth_mult works
         only if the constant value exactly fits in an `unsigned int' without
         any truncation.  This means that multiplying by negative values does
         not work; results are off by 2^32 on a 32 bit machine.  */