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view lphobos/std/stdarg.d @ 1275:bedf0bfb8fdb
Implement first D-specific optimization pass: -simplify-drtcalls.
It uses the machinery of the standard -simplify-libcalls pass, but optimizes
calls to the D runtime instead of calls to C libraries.
At the moment, these optimizations are implemented by this pass:
- Avoid the runtime call for `arr.length = newlen` if it can determine that
the new length isn't longer than the old one.
- Ditto for `cast(T[]) arr` if it will clearly always succeed.
(e.g. if the length of the original array is zero, or if the old element
size is a multiple of the new element size)
author | Frits van Bommel <fvbommel wxs.nl> |
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date | Tue, 28 Apr 2009 21:58:06 +0200 |
parents | eef8ac26c66c |
children |
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/* * Placed in public domain. * Written by Hauke Duden and Walter Bright */ /* This is for use with variable argument lists with extern(D) linkage. */ /* Modified for LDC (LLVM D Compiler) by Tomas Lindquist Olsen, 2007 */ module std.stdarg; alias void* va_list; T va_arg(T)(ref va_list vp) { size_t size = T.sizeof > size_t.sizeof ? size_t.sizeof : T.sizeof; va_list vptmp = cast(va_list)((cast(size_t)vp + size - 1) & ~(size - 1)); vp = vptmp + T.sizeof; return *cast(T*)vptmp; }