From a8b2fae0da7a630e9d7b432166f2ce7a20f09de9 Mon Sep 17 00:00:00 2001
From: ceriel <none@none>
Date: Mon, 2 Mar 1992 11:52:09 +0000
Subject: [PATCH] Fixed CFU implementation

---
 mach/i386/libem/fp8087.s | 12 +++++++++++-
 mach/i86/libem/fp8087.s  | 11 ++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/mach/i386/libem/fp8087.s b/mach/i386/libem/fp8087.s
index 39ee20e3e..42a20df77 100644
--- a/mach/i386/libem/fp8087.s
+++ b/mach/i386/libem/fp8087.s
@@ -329,7 +329,8 @@ bigmin:
 	fstcw	4(bx)
 	wait
 	mov	dx,4(bx)
-	or	4(bx),0xc00	! truncating mode
+	and	4(bx),0xf3ff
+	or	4(bx),0x400	! to -infinity
 	wait
 	fldcw	4(bx)
 	cmp	8(bx),4
@@ -337,8 +338,12 @@ bigmin:
 				! loc 4 loc ? cfu
 	flds	12(bx)
 	fabs			! ???
+	fiaddl	(bigmin)
 	fistpl	12(bx)
 	wait
+	mov	ax,12(bx)
+	sub	ax,(bigmin)
+	mov	12(bx),ax
 1:
 	mov	4(bx),dx
 	wait
@@ -348,7 +353,12 @@ bigmin:
 				! loc 8 loc ? cfu
 	fldd	12(bx)
 	fabs			! ???
+	fiaddl	(bigmin)
 	fistpl	16(bx)
+	wait
+	mov	ax,16(bx)
+	sub	ax,(bigmin)
+	mov	16(bx),ax
 	jmp	1b
 
 .cff4:
diff --git a/mach/i86/libem/fp8087.s b/mach/i86/libem/fp8087.s
index ef433c23e..c6c71e74f 100644
--- a/mach/i86/libem/fp8087.s
+++ b/mach/i86/libem/fp8087.s
@@ -487,7 +487,8 @@ bigmin:
 	fstcw	-2(bx)
 	wait
 	mov	dx,-2(bx)
-	or	-2(bx),0xc00	! truncating mode
+	and	-2(bx),0xf3ff
+	or	-2(bx),0x400	! to -infinity
 	wait
 	fldcw	-2(bx)
 	wait
@@ -499,8 +500,12 @@ bigmin:
 	wait
 	fabs			! ???
 	wait
+	fiaddl	(bigmin)
 	fistpl	6(bx)
 	wait
+	mov	ax,8(bx)
+	sub	ax,(bigmin+2)
+	mov	8(bx),ax
 	cmp	2(bx),2
 	jne	1f
 	mov	ax,6(bx)
@@ -517,8 +522,12 @@ bigmin:
 	wait
 	fabs			! ???
 	wait
+	fiaddl	(bigmin)
 	fistpl	10(bx)
 	wait
+	mov	ax,12(bx)
+	sub	ax,(bigmin+2)
+	mov	12(bx),ax
 	cmp	2(bx),2
 	jne	1b
 	mov	ax,10(bx)
-- 
2.34.1