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Document the updated behaviour of __builtin_constant_p introduced in r146236. 

llvm-svn: 146241
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Richard Smith 2011-12-09 03:40:28 +00:00
parent 6af472aa3b
commit eb45aa0b2e
1 changed files with 7 additions and 2 deletions
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9
clang/docs/InternalsManual.html
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@ -1692,7 +1692,10 @@ interacts with constant evaluation:</p>
any evaluatable subexpression to be accepted as an integer constant
expression.</li>
<li><b><tt>__builtin_constant_p</tt></b>: This returns true (as a integer
constant expression) if the operand is any evaluatable constant. As a
constant expression) if the operand evaluates to either a numeric value
(that is, not a pointer cast to integral type) of integral, enumeration,
floating or complex type, or if it evaluates to the address of the first
character of a string literal (possibly cast to some other type). As a
special case, if <tt>__builtin_constant_p</tt> is the (potentially
parenthesized) condition of a conditional operator expression ("?:"), only
the true side of the conditional operator is considered, and it is evaluated
@ -1707,7 +1710,9 @@ interacts with constant evaluation:</p>
floating-point literal.</li>
<li><b><tt>__builtin_abs,copysign,..</tt></b>: These are constant folded as
general constant expressions.</li>
<li><b><tt>__builtin_strlen</tt></b> and <b><tt>strlen</tt></b>: These are constant folded as integer constant expressions if the argument is a string literal.</li>
<li><b><tt>__builtin_strlen</tt></b> and <b><tt>strlen</tt></b>: These are
constant folded as integer constant expressions if the argument is a string
literal.</li>
</ul>