[Bug c/60668] New: simplify-rtx.c:1676: minor tidyup in if ... else chain

[dcb314 at hotmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60668

            Bug ID: 60668
           Summary: simplify-rtx.c:1676: minor tidyup in if ... else chain
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com

Source code is

      if (arg0 == 0)
        val = GET_MODE_PRECISION (mode) - 1;
      else if (arg0 >= 0)
        val = GET_MODE_PRECISION (mode) - floor_log2 (arg0) - 2;
      else if (arg0 < 0)
        val = GET_MODE_PRECISION (mode) - floor_log2 (~arg0) - 2;

Second if overlaps first and third if looks redundant.
Maybe better code might be

      if (arg0 == 0)
        val = GET_MODE_PRECISION (mode) - 1;
      else if (arg0 > 0)
        val = GET_MODE_PRECISION (mode) - floor_log2 (arg0) - 2;
      else
        val = GET_MODE_PRECISION (mode) - floor_log2 (~arg0) - 2;