Mercurial > projects > ldc
view tests/mini/asm10.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> |
---|---|
date | Tue, 28 Apr 2009 21:58:06 +0200 |
parents | 97d80437cb80 |
children |
line wrap: on
line source
module asm10; struct S { ushort first; ushort second; int unaccessed; } void main() { auto s = S(512, 42, -1); ushort x = 0; version(D_InlineAsm_X86) { asm { lea EAX, s; mov CX, S.second[EAX]; mov x, CX; mov S.first[EAX], 640; } } else version(D_InlineAsm_X86_64) { asm { lea RAX, s; mov CX, S.second[RAX]; mov x, CX; mov S.first[RAX], 640; } } assert(x == 42); assert(s.first == 640); assert(s.second == 42); assert(s.unaccessed == -1); }