/********************************************** To provide access to features that would be otherwise counterproductive or difficult to implement, compilers provide an interface consisting of a set of builtins (also called intrinsics) which can be called like normal functions. This module exposes builtins both common to all D compilers (those provided by the frontend) and specific to the host compiler i.e. those specific to either LLVM or GCC (`ldc.intrinsics` and `gcc.builtins` are publicly imported, respectively). Host-specific intrinsics cannot be reliably listed here, however listings can be found at the documentation for the relevant backends, i.e. $(LINK2 https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html, GCC) and $(LINK2 https://llvm.org/docs/LangRef.html, LLVM). It should be noted that not all builtins listed are necessarily supported by the host compiler, please file a bug if this is the case for your workload. Use of this module reduces the amount of conditional compilation needed to use a given builtin. For example, to write a target independent function that uses prefetching we can write the following: --- float usePrefetch(float[] x) { // There is only one import statement required rather than two (versioned) imports import core.builtins; version (GNU) __builtin_prefetch(x.ptr); version (LDC) /+ For the curious: 0, 3, 1 mean `x` will only be read-from (0), it will be used very often (3), and it should be fetched to the data-cache (1). +/ llvm_prefetch(x.ptr, 0, 3, 1); const doMath = blahBlahBlah; return doMath; } --- Copyright: Copyright © 2021, The D Language Foundation License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0) Authors: Walter Bright Source: $(DRUNTIMESRC core/builtins.d) */ module core.builtins; version (GNU) public import gcc.builtins; version (LDC) public import ldc.intrinsics; /// Writes `s` to `stderr` during CTFE (does nothing at runtime). void __ctfeWrite(scope const(char)[] s) @nogc @safe pure nothrow {}