[Bug tree-optimization/68264] New: tree-call-cdce wrongly uses ordered comparisons

[jsm28 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68264

            Bug ID: 68264
           Summary: tree-call-cdce wrongly uses ordered comparisons
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jsm28 at gcc dot gnu.org
  Target Milestone: ---

When tree-call-cdce.c:gen_conditions_for_domain generates comparisons to test
if a function argument is within a range for which errno cannot be set, it uses
ordered comparisons LT_EXPR LE_EXPR GT_EXPR GE_EXPR.  But these will raise
"invalid" for quiet NaNs, when the functions should generally return a quiet
NaN with no exceptions raised.  Unordered comparisons should be used instead.