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// AsmJit - Machine code generation for C++
//
// * Official AsmJit Home Page: https://asmjit.com
// * Official Github Repository: https://github.com/asmjit/asmjit
//
// Copyright (c) 2008-2020 The AsmJit Authors
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
#ifndef ASMJIT_TEST_MISC_H_INCLUDED
#define ASMJIT_TEST_MISC_H_INCLUDED
#include <asmjit/x86.h>
namespace asmtest {
// Generate a typical alpha blend function using SSE2 instruction set. Used
// for benchmarking and also in test86. The generated code should be stable
// and fully functional.
static void generateAlphaBlend(asmjit::x86::Compiler& cc) {
using namespace asmjit;
using namespace asmjit::x86;
Gp dst = cc.newIntPtr("dst");
Gp src = cc.newIntPtr("src");
Gp i = cc.newIntPtr("i");
Gp j = cc.newIntPtr("j");
Gp t = cc.newIntPtr("t");
Xmm vzero = cc.newXmm("vzero");
Xmm v0080 = cc.newXmm("v0080");
Xmm v0101 = cc.newXmm("v0101");
Label L_SmallLoop = cc.newLabel();
Label L_SmallEnd = cc.newLabel();
Label L_LargeLoop = cc.newLabel();
Label L_LargeEnd = cc.newLabel();
Label L_DataPool = cc.newLabel();
cc.addFunc(FuncSignatureT<void, void*, const void*, size_t>(CallConv::kIdHost));
cc.setArg(0, dst);
cc.setArg(1, src);
cc.setArg(2, i);
// How many pixels have to be processed to make the loop aligned.
cc.lea(t, x86::ptr(L_DataPool));
cc.xorps(vzero, vzero);
cc.movaps(v0080, x86::ptr(t, 0));
cc.movaps(v0101, x86::ptr(t, 16));
cc.xor_(j, j);
cc.sub(j, dst);
cc.and_(j, 15);
cc.shr(j, 2);
cc.jz(L_SmallEnd);
cc.cmp(j, i);
cc.cmovg(j, i); // j = min(i, j).
cc.sub(i, j); // i -= j.
// Small loop.
cc.bind(L_SmallLoop);
{
Xmm x0 = cc.newXmm("x0");
Xmm y0 = cc.newXmm("y0");
Xmm a0 = cc.newXmm("a0");
cc.movd(y0, x86::ptr(src));
cc.movd(x0, x86::ptr(dst));
cc.pcmpeqb(a0, a0);
cc.pxor(a0, y0);
cc.psrlw(a0, 8);
cc.punpcklbw(x0, vzero);
cc.pshuflw(a0, a0, x86::Predicate::shuf(1, 1, 1, 1));
cc.punpcklbw(y0, vzero);
cc.pmullw(x0, a0);
cc.paddsw(x0, v0080);
cc.pmulhuw(x0, v0101);
cc.paddw(x0, y0);
cc.packuswb(x0, x0);
cc.movd(x86::ptr(dst), x0);
cc.add(dst, 4);
cc.add(src, 4);
cc.dec(j);
cc.jnz(L_SmallLoop);
}
// Second section, prepare for an aligned loop.
cc.bind(L_SmallEnd);
cc.test(i, i);
cc.mov(j, i);
cc.jz(cc.func()->exitLabel());
cc.and_(j, 3);
cc.shr(i, 2);
cc.jz(L_LargeEnd);
// Aligned loop.
cc.bind(L_LargeLoop);
{
Xmm x0 = cc.newXmm("x0");
Xmm x1 = cc.newXmm("x1");
Xmm y0 = cc.newXmm("y0");
Xmm a0 = cc.newXmm("a0");
Xmm a1 = cc.newXmm("a1");
cc.movups(y0, x86::ptr(src));
cc.movaps(x0, x86::ptr(dst));
cc.pcmpeqb(a0, a0);
cc.xorps(a0, y0);
cc.movaps(x1, x0);
cc.psrlw(a0, 8);
cc.punpcklbw(x0, vzero);
cc.movaps(a1, a0);
cc.punpcklwd(a0, a0);
cc.punpckhbw(x1, vzero);
cc.punpckhwd(a1, a1);
cc.pshufd(a0, a0, x86::Predicate::shuf(3, 3, 1, 1));
cc.pshufd(a1, a1, x86::Predicate::shuf(3, 3, 1, 1));
cc.pmullw(x0, a0);
cc.pmullw(x1, a1);
cc.paddsw(x0, v0080);
cc.paddsw(x1, v0080);
cc.pmulhuw(x0, v0101);
cc.pmulhuw(x1, v0101);
cc.add(src, 16);
cc.packuswb(x0, x1);
cc.paddw(x0, y0);
cc.movaps(x86::ptr(dst), x0);
cc.add(dst, 16);
cc.dec(i);
cc.jnz(L_LargeLoop);
}
cc.bind(L_LargeEnd);
cc.test(j, j);
cc.jnz(L_SmallLoop);
cc.endFunc();
// Data.
cc.align(kAlignData, 16);
cc.bind(L_DataPool);
cc.embedUInt16(uint16_t(0x0080u), 8);
cc.embedUInt16(uint16_t(0x0101u), 8);
}
} // {asmtest}
#endif // ASMJIT_TEST_MISC_H_INCLUDED
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