From 976d8d982e8acd9907d65eaf5e9008d9bbf29782 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sat, 2 Oct 2021 00:03:27 +0200
Subject: Naively switched from inline assembly to std library

---
 Opcode/Ice/IceFPU.h | 96 +++++------------------------------------------------
 1 file changed, 8 insertions(+), 88 deletions(-)

(limited to 'Opcode/Ice/IceFPU.h')

diff --git a/Opcode/Ice/IceFPU.h b/Opcode/Ice/IceFPU.h
index 9e57960..18ad7ae 100644
--- a/Opcode/Ice/IceFPU.h
+++ b/Opcode/Ice/IceFPU.h
@@ -12,6 +12,9 @@
 #ifndef __ICEFPU_H__
 #define __ICEFPU_H__
 
+	#include <algorithm>
+	#include <cmath>
+
 	#define	SIGN_BITMASK			0x80000000
 
 	//! Integer representation of a floating-point value.
@@ -41,16 +44,7 @@
 	//! Fast square root for floating-point values.
 	inline_ float FastSqrt(float square)
 	{
-			float retval;
-
-			__asm {
-					mov             eax, square
-					sub             eax, 0x3F800000
-					sar             eax, 1
-					add             eax, 0x3F800000
-					mov             [retval], eax
-			}
-			return retval;
+		return std::sqrt(square);
 	}
 
 	//! Saturates positive to zero.
@@ -178,102 +172,28 @@
 		return x*x < epsilon;
 	}
 
-	#define FCOMI_ST0	_asm	_emit	0xdb	_asm	_emit	0xf0
-	#define FCOMIP_ST0	_asm	_emit	0xdf	_asm	_emit	0xf0
-	#define FCMOVB_ST0	_asm	_emit	0xda	_asm	_emit	0xc0
-	#define FCMOVNB_ST0	_asm	_emit	0xdb	_asm	_emit	0xc0
-
-	#define FCOMI_ST1	_asm	_emit	0xdb	_asm	_emit	0xf1
-	#define FCOMIP_ST1	_asm	_emit	0xdf	_asm	_emit	0xf1
-	#define FCMOVB_ST1	_asm	_emit	0xda	_asm	_emit	0xc1
-	#define FCMOVNB_ST1	_asm	_emit	0xdb	_asm	_emit	0xc1
-
-	#define FCOMI_ST2	_asm	_emit	0xdb	_asm	_emit	0xf2
-	#define FCOMIP_ST2	_asm	_emit	0xdf	_asm	_emit	0xf2
-	#define FCMOVB_ST2	_asm	_emit	0xda	_asm	_emit	0xc2
-	#define FCMOVNB_ST2	_asm	_emit	0xdb	_asm	_emit	0xc2
-
-	#define FCOMI_ST3	_asm	_emit	0xdb	_asm	_emit	0xf3
-	#define FCOMIP_ST3	_asm	_emit	0xdf	_asm	_emit	0xf3
-	#define FCMOVB_ST3	_asm	_emit	0xda	_asm	_emit	0xc3
-	#define FCMOVNB_ST3	_asm	_emit	0xdb	_asm	_emit	0xc3
-
-	#define FCOMI_ST4	_asm	_emit	0xdb	_asm	_emit	0xf4
-	#define FCOMIP_ST4	_asm	_emit	0xdf	_asm	_emit	0xf4
-	#define FCMOVB_ST4	_asm	_emit	0xda	_asm	_emit	0xc4
-	#define FCMOVNB_ST4	_asm	_emit	0xdb	_asm	_emit	0xc4
-
-	#define FCOMI_ST5	_asm	_emit	0xdb	_asm	_emit	0xf5
-	#define FCOMIP_ST5	_asm	_emit	0xdf	_asm	_emit	0xf5
-	#define FCMOVB_ST5	_asm	_emit	0xda	_asm	_emit	0xc5
-	#define FCMOVNB_ST5	_asm	_emit	0xdb	_asm	_emit	0xc5
-
-	#define FCOMI_ST6	_asm	_emit	0xdb	_asm	_emit	0xf6
-	#define FCOMIP_ST6	_asm	_emit	0xdf	_asm	_emit	0xf6
-	#define FCMOVB_ST6	_asm	_emit	0xda	_asm	_emit	0xc6
-	#define FCMOVNB_ST6	_asm	_emit	0xdb	_asm	_emit	0xc6
-
-	#define FCOMI_ST7	_asm	_emit	0xdb	_asm	_emit	0xf7
-	#define FCOMIP_ST7	_asm	_emit	0xdf	_asm	_emit	0xf7
-	#define FCMOVB_ST7	_asm	_emit	0xda	_asm	_emit	0xc7
-	#define FCMOVNB_ST7	_asm	_emit	0xdb	_asm	_emit	0xc7
-
 	//! A global function to find MAX(a,b) using FCOMI/FCMOV
 	inline_ float FCMax2(float a, float b)
 	{
-		float Res;
-		_asm	fld		[a]
-		_asm	fld		[b]
-		FCOMI_ST1
-		FCMOVB_ST1
-		_asm	fstp	[Res]
-		_asm	fcomp
-		return Res;
+		return std::max(a, b);
 	}
 
 	//! A global function to find MIN(a,b) using FCOMI/FCMOV
 	inline_ float FCMin2(float a, float b)
 	{
-		float Res;
-		_asm	fld		[a]
-		_asm	fld		[b]
-		FCOMI_ST1
-		FCMOVNB_ST1
-		_asm	fstp	[Res]
-		_asm	fcomp
-		return Res;
+		return std::min(a, b);
 	}
 
 	//! A global function to find MAX(a,b,c) using FCOMI/FCMOV
 	inline_ float FCMax3(float a, float b, float c)
 	{
-		float Res;
-		_asm	fld		[a]
-		_asm	fld		[b]
-		_asm	fld		[c]
-		FCOMI_ST1
-		FCMOVB_ST1
-		FCOMI_ST2
-		FCMOVB_ST2
-		_asm	fstp	[Res]
-		_asm	fcompp
-		return Res;
+		return std::max(std::max(a, b), c);
 	}
 
 	//! A global function to find MIN(a,b,c) using FCOMI/FCMOV
 	inline_ float FCMin3(float a, float b, float c)
 	{
-		float Res;
-		_asm	fld		[a]
-		_asm	fld		[b]
-		_asm	fld		[c]
-		FCOMI_ST1
-		FCMOVNB_ST1
-		FCOMI_ST2
-		FCMOVNB_ST2
-		_asm	fstp	[Res]
-		_asm	fcompp
-		return Res;
+		return std::min(std::min(a, b), c);
 	}
 
 	inline_ int ConvertToSortable(float f)
-- 
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