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asmjit_test_x86_asm.cpp
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asmjit_test_x86_asm.cpp
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// [AsmJit]
// Complete x86/x64 JIT and Remote Assembler for C++.
//
// [License]
// Zlib - See LICENSE.md file in the package.
// [Dependencies]
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <setjmp.h>
#include "./asmjit.h"
using namespace asmjit;
// Signature of the generated function.
typedef void (*SumIntsFunc)(int* dst, const int* a, const int* b);
// This function works for both X86Assembler and X86Builder. It shows how
// `X86Emitter` can be used to make your code more generic.
static void makeFunc(X86Emitter* emitter) {
// Decide which registers will be mapped to function arguments. Try changing
// registers of `dst`, `src_a`, and `src_b` and see what happens in function's
// prolog and epilog.
X86Gp dst = emitter->zax();
X86Gp src_a = emitter->zcx();
X86Gp src_b = emitter->zdx();
// Decide which vector registers to use. We use these to keep the code generic,
// you can switch to any other registers when needed.
X86Xmm vec0 = x86::xmm0;
X86Xmm vec1 = x86::xmm1;
// Create and initialize `FuncDetail` and `FuncFrameInfo`. Both are
// needed to create a function and they hold different kind of data.
FuncDetail func;
func.init(FuncSignature3<void, int*, const int*, const int*>(CallConv::kIdHost));
FuncFrameInfo ffi;
ffi.setDirtyRegs(X86Reg::kKindVec, // Make XMM0 and XMM1 dirty. VEC kind
Utils::mask(0, 1)); // describes XMM|YMM|ZMM registers.
FuncArgsMapper args(&func); // Create function arguments mapper.
args.assignAll(dst, src_a, src_b); // Assign our registers to arguments.
args.updateFrameInfo(ffi); // Reflect our args in FuncFrameInfo.
FuncFrameLayout layout; // Create the FuncFrameLayout, which
layout.init(func, ffi); // contains metadata of prolog/epilog.
// Emit function prolog and allocate arguments to registers.
FuncUtils::emitProlog(emitter, layout);
FuncUtils::allocArgs(emitter, layout, args);
emitter->movdqu(vec0, x86::ptr(src_a)); // Load 4 ints from [src_a] to XMM0.
emitter->movdqu(vec1, x86::ptr(src_b)); // Load 4 ints from [src_b] to XMM1.
emitter->paddd(vec0, vec1); // Add 4 ints in XMM1 to XMM0.
emitter->movdqu(x86::ptr(dst), vec0); // Store the result to [dst].
// Emit function epilog and return.
FuncUtils::emitEpilog(emitter, layout);
}
int main(int argc, char* argv[]) {
JitRuntime rt; // Create JIT Runtime
CodeHolder code; // Create a CodeHolder.
code.init(rt.getCodeInfo()); // Initialize it to match `rt`.
X86Assembler a(&code); // Create and attach X86Assembler to `code`.
FileLogger logger(stderr);
code.setLogger(&logger);
makeFunc(a.asEmitter());
SumIntsFunc fn;
Error err = rt.add(&fn, &code); // Add the code generated to the runtime.
if (err) return 1; // Handle a possible error case.
// Execute the generated function.
int inA[4] = { 4, 3, 2, 1 };
int inB[4] = { 1, 5, 2, 8 };
int out[4];
fn(out, inA, inB);
// Prints {5 8 4 9}
printf("{%d %d %d %d}\n", out[0], out[1], out[2], out[3]);
rt.release(fn);
if (out[0] == 5 && out[1] == 8 && out[2] == 4 && out[3] == 9)
return 0;
else
return 1;
}