speeding up simulation using dedicated full dpi-based FPU core

2021-01-06 18:44:06 -08:00
parent 2058718f0f
commit 2b8435471a
26 changed files with 990 additions and 430 deletions
--- a/hw/dpi/float_dpi.cpp
+++ b/hw/dpi/float_dpi.cpp
@@ -0,0 +1,264 @@
+#include <stdio.h>
+#include <math.h>
+#include <unordered_map>
+#include <vector>
+#include <mutex>
+#include <iostream>
+#include "svdpi.h"
+#include "verilated_vpi.h"
+#include "VX_config.h"
+
+extern "C" {
+  void dpi_fadd(int a, int b, int frm, int* result, int* fflags);
+  void dpi_fsub(int a, int b, int frm, int* result, int* fflags);
+  void dpi_fmul(int a, int b, int frm, int* result, int* fflags);
+  void dpi_fmadd(int a, int b, int c, int frm, int* result, int* fflags);
+  void dpi_fmsub(int a, int b, int c, int frm, int* result, int* fflags);
+  void dpi_fnmadd(int a, int b, int c, int frm, int* result, int* fflags);
+  void dpi_fnmsub(int a, int b, int c, int frm, int* result, int* fflags);
+
+  void dpi_fdiv(int a, int b, int frm, int* result, int* fflags);
+  void dpi_fsqrt(int a, int frm, int* result, int* fflags);
+  
+  void dpi_ftoi(int a, int frm, int* result, int* fflags);
+  void dpi_ftou(int a, int frm, int* result, int* fflags);
+  void dpi_itof(int a, int frm, int* result, int* fflags);
+  void dpi_utof(int a, int frm, int* result, int* fflags);
+
+  void dpi_fclss(int a, int* result);
+  void dpi_fsgnj(int a, int* result);
+  void dpi_fsgnjn(int a, int* result);
+  void dpi_fsgnjx(int a, int* result);
+
+  void dpi_flt(int a, int b, int* result, int* fflags);
+  void dpi_fle(int a, int b, int* result, int* fflags);
+  void dpi_feq(int a, int b, int* result, int* fflags);
+  void dpi_fmin(int a, int b, int* result, int* fflags);
+  void dpi_fmax(int a, int b, int* result, int* fflags);
+}
+
+union Float_t {    
+    float f;
+    int   i;
+    struct {
+        uint32_t man  : 23;
+        uint32_t exp  : 8;
+        uint32_t sign : 1;
+    } parts;
+};
+
+void dpi_fadd(int a, int b, int frm, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = fa.f + fb.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fsub(int a, int b, int frm, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = fa.f - fb.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fmul(int a, int b, int frm, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = fa.f * fb.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fmadd(int a, int b, int c, int frm, int* result, int* fflags) {
+  Float_t fa, fb, fc, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fc.i = c;
+  fr.f = fa.f * fb.f + fc.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fmsub(int a, int b, int c, int frm, int* result, int* fflags) {
+  Float_t fa, fb, fc, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fc.i = c;
+  fr.f = fa.f * fb.f - fc.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fnmadd(int a, int b, int c, int frm, int* result, int* fflags) {
+  Float_t fa, fb, fc, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fc.i = c;
+  fr.f = -(fa.f * fb.f + fc.f);
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fnmsub(int a, int b, int c, int frm, int* result, int* fflags) {
+  Float_t fa, fb, fc, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fc.i = c;
+  fr.f = -(fa.f * fb.f - fc.f);
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fdiv(int a, int b, int frm, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = fa.f / fb.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fsqrt(int a, int frm, int* result, int* fflags) {
+  Float_t fa, fr;
+
+  fa.i = a;
+  fr.f = sqrtf(fa.f);
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_ftoi(int a, int frm, int* result, int* fflags) {
+  Float_t fa, fr;
+
+  fa.i = a;
+  fr.i = int(fa.f);   
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_ftou(int a, int frm, int* result, int* fflags) {
+  Float_t fa, fr;
+
+  fa.i = a;
+  fr.i = unsigned(fa.f);   
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_itof(int a, int frm, int* result, int* fflags) {
+  Float_t fa, fr;
+
+  fr.f = (float)a;   
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_utof(int a, int frm, int* result, int* fflags) {
+  Float_t fa, fr;
+
+  unsigned ua = a;
+  fr.f = (float)ua;   
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_flt(int a, int b, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = fa.f < fb.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fle(int a, int b, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = fa.f <= fb.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_feq(int a, int b, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = fa.f == fb.f;
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fmin(int a, int b, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = std::min<float>(fa.f, fb.f);
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fmax(int a, int b, int* result, int* fflags) {
+  Float_t fa, fb, fr;
+
+  fa.i = a;
+  fb.i = b;
+  fr.f = std::max<float>(fa.f, fb.f);
+
+  *result = fr.i;
+  *fflags = 0;
+}
+
+void dpi_fclss(int a, int* result) {
+  // TODO
+  *result = 0;
+}
+
+void dpi_fsgnj(int a, int* result) {
+  // TODO
+  *result = 0;
+}
+
+void dpi_fsgnjn(int a, int* result) {
+  // TODO
+  *result = 0;
+}
+
+void dpi_fsgnjx(int a, int* result) {
+  // TODO
+  *result = 0;
+}