[Bug tree-optimization/86274] [7/8 Regression] SEGFAULT when logging std::to_string(NAN)

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86274

--- Comment #19 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Sat Jul 14 21:32:10 2018
New Revision: 262661

URL: https://gcc.gnu.org/viewcvs?rev=262661&root=gcc&view=rev
Log:
PR tree-optimization/86274 - SEGFAULT when logging std::to_string(NAN)

gcc/ChangeLog:

        PR tree-optimization/86274
        * gimple-ssa-sprintf.c (fmtresult::type_max_digits): Verify
        precondition.
        (format_floating): Correct handling of infinities and NaNs.

gcc/testsuite/ChangeLog:

        PR tree-optimization/86274
        * gcc.dg/tree-ssa/builtin-sprintf-9.c: New test.
        * gcc.dg/tree-ssa/builtin-sprintf-warn-1.c: Adjust.
        * gcc.dg/tree-ssa/builtin-sprintf-warn-10.c: Same.
        * gcc.dg/tree-ssa/builtin-sprintf-warn-15.c: Same.
        * gcc.dg/tree-ssa/builtin-sprintf-warn-7.c: Same.
        * gcc.dg/tree-ssa/builtin-sprintf.c: Same.
        * gcc.dg/tree-ssa/pr83198.c: Same.


Added:
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/torture/builtin-sprintf.c
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-9.c
Modified:
    branches/gcc-8-branch/gcc/ChangeLog
    branches/gcc-8-branch/gcc/gimple-ssa-sprintf.c
    branches/gcc-8-branch/gcc/testsuite/ChangeLog
   
branches/gcc-8-branch/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-1.c
   
branches/gcc-8-branch/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-10.c
   
branches/gcc-8-branch/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-15.c
   
branches/gcc-8-branch/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-7.c
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf.c
    branches/gcc-8-branch/gcc/testsuite/gcc.dg/tree-ssa/pr83198.c