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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkCpu.h"
#include "SkRasterPipeline.h"
#include <memory>
#if defined(__clang__)
#pragma clang diagnostic ignored "-Wduplicate-enum"
#endif
#define XBYAK_NO_OP_NAMES // xor(), not(), etc. -> xor_(), not_(), etc.
#include "xbyak/xbyak.h"
namespace {
struct Pipeline : public Xbyak::CodeGenerator {
static std::shared_ptr<Pipeline> Create(const SkRasterPipeline::Stage* stages, int n) {
if (!SkCpu::Supports(SkCpu::HSW)) {
// TODO: other targets?
return nullptr;
}
bool supported = true;
auto pipeline = std::make_shared<Pipeline>(stages, n, &supported);
if (supported) {
return pipeline;
}
return nullptr;
}
Pipeline(const SkRasterPipeline::Stage* stages, int nstages, bool* supported) {
// Set up some register name aliases.
// y = rsi
auto x = rdi, n = rdx;
auto r = ymm0, g = ymm1, b = ymm2, a = ymm3,
dr = ymm4, dg = ymm5, db = ymm6, da = ymm7;
Xbyak::Label floatOneStorage,
start;
// TODO: set up (x+0.5,y+0.5) in (r,g)
vxorps(r,r);
vxorps(g,g);
vxorps(b,b);
vxorps(a,a);
vxorps(dr,dr);
vxorps(dg,dg);
vxorps(db,db);
vxorps(da,da);
auto zero = ymm14,
one = ymm15;
vxorps(zero, zero);
vbroadcastss(one, ptr[rip + floatOneStorage]);
L(start);
//trap();
for (int i = 0; i < nstages; i++) {
switch(stages[i].stage) {
case SkRasterPipeline::load_f16:
mov(rax, (size_t)stages[i].ctx);
mov(rax, ptr[rax]);
vmovdqu(xmm0, ptr[rax+x*8+ 0]);
vmovdqu(xmm1, ptr[rax+x*8+16]);
vmovdqu(xmm2, ptr[rax+x*8+32]);
vmovdqu(xmm3, ptr[rax+x*8+48]);
vpunpcklwd(xmm8, xmm1, xmm0); vpunpckhwd(xmm0 , xmm1, xmm0);
vpunpcklwd(xmm1, xmm3, xmm2); vpunpckhwd(xmm2 , xmm3, xmm2);
vpunpcklwd(xmm9, xmm0, xmm8); vpunpckhwd(xmm8 , xmm0, xmm8);
vpunpcklwd(xmm3, xmm2, xmm1); vpunpckhwd(xmm10, xmm2, xmm1);
vpunpcklqdq(xmm0, xmm3, xmm9); vcvtph2ps(ymm0, xmm0);
vpunpckhqdq(xmm1, xmm3, xmm9); vcvtph2ps(ymm1, xmm1);
vpunpcklqdq(xmm2, xmm10, xmm8); vcvtph2ps(ymm2, xmm2);
vpunpckhqdq(xmm3, xmm10, xmm8); vcvtph2ps(ymm3, xmm3);
break;
case SkRasterPipeline::unpremul:
vcmpeqps(ymm10, zero, a); // ymm10: a == 0
vdivps(ymm11, one, a); // ymm11: 1/a
vblendvps(ymm10, ymm10, zero, ymm11); // ymm10: (a==0) ? 0 : 1/a
vmulps(r, r, ymm10);
vmulps(g, g, ymm10);
vmulps(b, b, ymm10);
break;
case SkRasterPipeline::store_f16:
mov(rax, (size_t)stages[i].ctx);
mov(rax, ptr[rax]);
vcvtps2ph(xmm8 , ymm0, 4);
vcvtps2ph(xmm9 , ymm1, 4);
vcvtps2ph(xmm10, ymm2, 4);
vcvtps2ph(xmm11, ymm3, 4);
vpunpcklwd(xmm12, xmm9 , xmm8 );
vpunpckhwd(xmm8 , xmm9 , xmm8 );
vpunpcklwd(xmm9 , xmm11, xmm10);
vpunpckhwd(xmm10, xmm11, xmm10);
vpunpckldq(xmm11, xmm9 , xmm12); vmovdqu(ptr[rax+x*8+ 0], xmm11);
vpunpckhdq(xmm9 , xmm9 , xmm12); vmovdqu(ptr[rax+x*8+16], xmm9 );
vpunpckldq(xmm9 , xmm10, xmm8 ); vmovdqu(ptr[rax+x*8+32], xmm9 );
vpunpckhdq(xmm8 , xmm10, xmm8 ); vmovdqu(ptr[rax+x*8+48], xmm8 );
break;
default:
*supported = false;
return;
}
}
add(x, 8);
cmp(x, n);
jl(start);
vzeroupper();
ret();
L(floatOneStorage); df(1.0f);
}
void df(float f) {
union { float f; uint32_t x; } pun = {f};
dd(pun.x);
}
void dp(void* p) {
union { void* p; uint64_t x; } pun = {p};
dq(pun.x);
}
void trap() {
dw(0x0b0f);
}
};
} // namespace
std::function<void(size_t, size_t, size_t)> SkRasterPipeline::jit() const {
try {
if (auto pipeline = Pipeline::Create(fStages.data(), SkToInt(fStages.size()))) {
return [pipeline] (size_t x, size_t y, size_t n) {
auto call = pipeline->getCode<void(*)(size_t, size_t, size_t)>();
//printf("fn addr: %p\n", (void*)call);
call(x,y,n);
};
}
#if 0
SkDebugf("Cannot yet JIT with xbyak:\n");
this->dump();
#endif
return nullptr;
} catch(...) {
SkDebugf("caught exception\n");
return nullptr;
}
}
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