From: Guillermo J. Rozas <edu/mit/csail/zurich/gjr>
Date: Wed, 5 Aug 1992 23:34:40 +0000 (+0000)
Subject: Fix more floating-point documentation bugs.
X-Git-Tag: 20090517-FFI~9158
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=dcc4266d234344bb9f2ea51c360e11ae4fe4da60;p=mit-scheme.git

Fix more floating-point documentation bugs.
---

diff --git a/v7/src/compiler/machines/i386/instrf.scm b/v7/src/compiler/machines/i386/instrf.scm
index 656fde53a..5d1cadf74 100644
--- a/v7/src/compiler/machines/i386/instrf.scm
+++ b/v7/src/compiler/machines/i386/instrf.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/machines/i386/instrf.scm,v 1.11 1992/08/05 22:13:59 jinx Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/machines/i386/instrf.scm,v 1.12 1992/08/05 23:34:40 jinx Exp $
 
 Copyright (c) 1992 Massachusetts Institute of Technology
 
@@ -51,16 +51,18 @@ MIT in each case. |#
 (let-syntax
     ((define-binary-flonum
        (macro (mnemonic pmnemonic imnemonic digit opcode1 opcode2)
+	 ;; In the following code, the commented code follows the i486
+	 ;; manual, which is wrong.  The uncommented versions agree
+	 ;; with the hardware and the description in the i486 book.
+
+	 opcode2			; ignored
+
 	 `(begin
 	    (define-instruction ,mnemonic
 	      (((ST 0) (ST (? i)))
 	       (BYTE (8 #xd8)
 		     (8 (+ ,opcode1 i))))
 
-	      ;; In the following case, the manual uses opcode2
-	      ;; but the instructions (FDIV <-> FDIVR, FSUB <-> FSUBR)
-	      ;; are actually backwards.
-
 	      (((ST (? i)) (ST 0))
 	       (BYTE (8 #xdc)
 		     ;; (8 (+ ,opcode2 i))
@@ -69,7 +71,9 @@ MIT in each case. |#
 
 	      (()
 	       (BYTE (8 #xde)
-		     (8 (+ ,opcode2 1))))
+		     ;; (8 (+ ,opcode2 1))
+		     (8 (+ ,opcode1 1))
+		     ))
 
 	      ((D (? source mW))
 	       (BYTE (8 #xdc))
@@ -82,7 +86,9 @@ MIT in each case. |#
 	    (define-instruction ,pmnemonic
 	      (((ST (? i)) (ST 0))
 	       (BYTE (8 #xde)
-		     (8 (+ ,opcode2 i)))))
+		     ;; (8 (+ ,opcode2 i))
+		     (8 (+ ,opcode1 i))
+		     )))
 
 	    (define-instruction ,imnemonic
 	      ((L (? source mW))