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view tests/mini/callingconv1.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 | 12b423e17860 |
children | a400b1dd657f |
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module mini.callingconv1; extern(C) int printf(char*, ...); float foo(float a, float b) { return a + b; } void main() { float a = 1.5; float b = 2.5; float c; version(D_InlineAsm_X86) { asm { mov EAX, [a]; push EAX; mov EAX, [b]; push EAX; call foo; fstp c; } } else version(D_InlineAsm_X86_64) { asm { movss XMM0, [a]; movss XMM1, [b]; call foo; movss [c], XMM0; } } printf("%f\n", c); assert(c == 4.0); printf("passed %f\n", c); }