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xbyak profile with vtune
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/* | |
Description: | |
Code2 is consistantly faster than Code because SSE2 instructions (like movdqu) | |
is not cooperating well with AVX registers. use AVX (vmovdqu) as much as possible. | |
------------------------------------------------------------------------------ | |
Install vtune & make a symbolic link | |
/opt/intel/vtune_amplifier -> /home/xxx/intel/oneapi/vtune/2021.5.0/ | |
How to compile: add following rules to Makefile: | |
mytest: mytest.cpp ../xbyak/xbyak_util.h | |
$(CXX) $(CFLAGS) mytest.cpp -o $@ -DXBYAK_USE_VTUNE -I /opt/intel/vtune_amplifier/include/ -L /opt/intel/vtune_amplifier/lib64 -ljitprofiling -ldl | |
How to profile JIT-code with perf or VTune | |
$ source /opt/intel/vtune_amplifier/env/vars.sh | |
$ vtune-gui | |
application : mytest | |
application parameters: 2 | |
Hotspots | |
*/ | |
#include <chrono> | |
#include <math.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <xbyak/xbyak_util.h> | |
struct Code : public Xbyak::CodeGenerator { | |
Code() { | |
sub(rsp, 32 * 3); | |
mov(rax, 200123 * 200); | |
L(".sss"); | |
movdqu(ptr[rsp + 0], xmm5); | |
movdqu(ptr[rsp + 16], xmm6); | |
movdqu(ptr[rsp + 16 * 2], xmm7); | |
vpxor(ymm0, ymm0, ymm0); | |
vpxor(ymm1, ymm1, ymm1); | |
vpxor(ymm2, ymm2, ymm2); | |
sub(eax, 1); | |
jnz(".sss"); | |
add(rsp, 32 * 3); | |
mov(eax, 1); | |
ret(); | |
} | |
}; | |
struct Code2 : public Xbyak::CodeGenerator { | |
Code2() { | |
sub(rsp, 32 * 3); | |
mov(rax, 200123 * 200); | |
L(".sss"); | |
vmovdqu(ptr[rsp + 0], xmm5); | |
vmovdqu(ptr[rsp + 32], xmm6); | |
vmovdqu(ptr[rsp + 32 * 2], xmm7); | |
vpxor(ymm5, ymm5, ymm5); | |
vpxor(ymm6, ymm6, ymm6); | |
vpxor(ymm7, ymm7, ymm7); | |
/* | |
vpxor(ymm0, ymm0, ymm0); | |
vpxor(ymm1, ymm1, ymm1); | |
vpxor(ymm2, ymm2, ymm2); | |
*/ | |
sub(eax, 1); | |
jnz(".sss"); | |
add(rsp, 32 * 3); | |
mov(eax, 1); | |
ret(); | |
} | |
}; | |
template <typename F> float dura(const char *name, F func) { | |
auto t0 = std::chrono::high_resolution_clock::now(); | |
func(); | |
auto t1 = std::chrono::high_resolution_clock::now(); | |
std::chrono::duration<float> fsec = t1 - t0; | |
float ret = fsec.count() * 1000; | |
if (name) | |
std::cout << name << " took " << ret << "ms\n"; | |
return ret; | |
} | |
int main(int argc, char *argv[]) { | |
int mode = argc == 1 ? 0 : atoi(argv[1]); | |
Code c; | |
Code2 c2; | |
int (*f)() = (int (*)())c.getCode(); | |
int (*g)() = (int (*)())c2.getCode(); | |
printf("f:%p, %d\n", (const void *)f, (int)c.getSize()); | |
printf("g:%p, %d\n", (const void *)g, (int)c2.getSize()); | |
Xbyak::util::Profiler prof; | |
printf("mode=%d\n", mode); | |
prof.init(mode); | |
prof.set("f", (const void *)f, c.getSize()); | |
prof.set("g", (const void *)g, c2.getSize()); | |
auto ft = dura("f", f); | |
auto gt = dura("g", g); | |
printf("g is faster than f by %.1f%%\n", 100*((1./gt) - (1./ft))/(1./ft) ); | |
puts("end"); | |
} |
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