From 41b26fc450b60830ad3a9ed65941e51193d65e99 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sat, 2 Oct 2021 15:55:07 +0200
Subject: Removed inline assembly from fixed point number class

---
 Stars45/Fix.h | 103 +++++++++++++---------------------------------------------
 1 file changed, 22 insertions(+), 81 deletions(-)

(limited to 'Stars45')

diff --git a/Stars45/Fix.h b/Stars45/Fix.h
index d3aade0..4369812 100644
--- a/Stars45/Fix.h
+++ b/Stars45/Fix.h
@@ -49,14 +49,7 @@ const double fix_sixty_five=65536.0;
 
 inline int fast_f2i(double d)
 {
-    int i;
-
-    _asm {
-        fld   d
-        fistp i
-    }
-
-    return i;
+    return static_cast<int>(d);
 }
 
 // +--------------------------------------------------------------------+
@@ -73,18 +66,9 @@ public:
     static const fix     five;
     static const fix     ten;
 
-    fix() { }
-    fix(int n)        : val(n<<Precision) { }
-    fix(double d)
-    {
-        long ival;
-        _asm {
-            fld   fix_sixty_five
-            fmul  d
-            fistp ival
-        }
-        val=ival;
-    }
+    fix() : val(0) { }
+    fix(int n) : val(n<<Precision) { }
+    fix(double d) : val(static_cast<long>(d * fix_sixty_five)) { }
     fix(const fix& f) : val(f.val) { }
 
     // conversion operators:
@@ -95,12 +79,7 @@ public:
     // assignment operators:
     fix& operator=(const fix& f) { val=f.val; return *this; }
     fix& operator=(int n)        { val=(n<<Precision); return *this; }
-    fix& operator=(double d)     { long ival;
-        _asm { fld fix_sixty_five
-            fmul d
-            fistp ival }
-        val = ival;
-        return *this; }
+    fix& operator=(double d)     { val = static_cast<long>(d * fix_sixty_five); return *this; }
 
     // comparison operators:
     int operator==(const fix& f) const { return val==f.val; }
@@ -113,48 +92,22 @@ public:
     // arithmetic operators:
     fix  operator+(const fix& f) const { fix r; r.val = val+f.val; return r; }
     fix  operator-(const fix& f) const { fix r; r.val = val-f.val; return r; }
-    fix  operator*(const fix& f) const { long a=val; long b=f.val;
-        _asm {
-            mov   eax, a
-            mov   edx, b
-            imul  edx
-            shrd  eax, edx, 16
-            mov   a,   eax
-        }
-        fix r; r.val = a; return r; }
-    fix  operator/(const fix& f) const { long a=val; long b=f.val; 
-        _asm {
-            mov   eax, a
-            mov   ebx, b
-            mov   edx, eax
-            sar   edx, 16
-            shl   eax, 16
-            idiv  ebx
-            mov   a,   eax
-        }
-        fix r; r.val = a; return r; }
+    fix  operator*(const fix& f) const {
+        fix r;
+        r.val = (val * f.val) >> Precision;
+        return r; }
+    fix  operator/(const fix& f) const {
+        fix r;
+        r.val = (val << Precision) / f.val;
+        return r; }
     fix& operator+=(const fix& f)      { val+=f.val; return *this; }
     fix& operator-=(const fix& f)      { val-=f.val; return *this; }
-    fix& operator*=(const fix& f)      { long a=val; long b=f.val;
-        _asm {
-            mov   eax, a
-            mov   edx, b
-            imul  edx
-            shrd  eax, edx, 16
-            mov   a,   eax
-        }
-        val=a; return *this; }
-    fix& operator/=(const fix& f)      { long a=val; long b=f.val;
-        _asm {
-            mov   eax, a
-            mov   ebx, b
-            mov   edx, eax
-            sar   edx, 16
-            shl   eax, 16
-            idiv  ebx
-            mov   a,   eax
-        }
-        val=a; return *this; }
+    fix& operator*=(const fix& f)      {
+        val = (val * f.val) >> Precision;
+        return *this; }
+    fix& operator/=(const fix& f)      {
+        val = (val << Precision) / f.val;
+        return *this; }
 
     fix  operator+(int n) const { fix r; r.val = val+(n<<Precision); return r; }
     fix  operator-(int n) const { fix r; r.val = val-(n<<Precision); return r; }
@@ -171,10 +124,8 @@ public:
     fix  operator/(double d) const { fix f(d); return (*this)/f; }
     fix& operator+=(double d)      { fix f(d); val+=f.val; return *this; }
     fix& operator-=(double d)      { fix f(d); val-=f.val; return *this; }
-    fix& operator*=(double d)      { int n; _asm { fld   d
-            fistp n } val*=n; return *this; }
-    fix& operator/=(double d)      { int n; _asm { fld   d
-            fistp n } val/=n; return *this; }
+    fix& operator*=(double d)      { val*=static_cast<long>(d); return *this; }
+    fix& operator/=(double d)      { val/=static_cast<long>(d); return *this; }
 
     // misc. functions:
     fix  truncate()    const { fix r; r.val = val&IntMask; return r; }
@@ -184,17 +135,7 @@ public:
     fix  adjust_up()   const { fix r; r.val = val+FractMask; return r; }
     fix  adjust_down() const { fix r; r.val = val-FractMask; return r; }
 
-    fix muldiv(const fix& num, const fix& den) const
-    { long a=val, b=num.val, c=den.val;
-        _asm {
-            mov   eax, a
-            mov   edx, b
-            mov   ebx, c
-            imul  edx
-            idiv  ebx
-            mov   a,   eax
-        }
-        fix r; r.val = a; return r; }
+    fix muldiv(const fix& num, const fix& den) const { return (*this) * num / den; }
 
     // data:
     long val;
-- 
cgit v1.1