[llvm-bugs] [Bug 43777] New: FP initializer using SNAN in expression

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https://bugs.llvm.org/show_bug.cgi?id=43777

            Bug ID: 43777
           Summary: FP initializer using SNAN in expression
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tydeman at tybor.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

It appears that an expression using any of the SNAN (signaling NaN) macros used
as the initializer of a floating-point variable is left as a SNAN.  For
example:

static double d = SNAN + 3.;   /* should be a quiet NAN */

The intent is only SNAN, +SNAN, -SNAN should be signaling NaNs, while any other
expression using a signaling NaN should be a quiet NaN.

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