From 220985cef4c09acc5d530314d38a4c9908b0b902 Mon Sep 17 00:00:00 2001 From: rtoy <rtoy> Date: Fri, 23 May 2008 18:15:30 +0000 Subject: [PATCH] Add functions for fused-multiply-add and fused-multiply-subtract. Not necessary but nice to have around. --- code/ppc-vm.lisp | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/code/ppc-vm.lisp b/code/ppc-vm.lisp index e64e29f6c..30d102de1 100644 --- a/code/ppc-vm.lisp +++ b/code/ppc-vm.lisp @@ -7,7 +7,7 @@ ;;; Scott Fahlman or slisp-group@cs.cmu.edu. ;;; (ext:file-comment - "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/ppc-vm.lisp,v 1.8 2006/11/14 04:47:49 rtoy Exp $") + "$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/code/ppc-vm.lisp,v 1.9 2008/05/23 18:15:30 rtoy Rel $") ;;; ;;; ********************************************************************** ;;; @@ -354,3 +354,17 @@ ;;; Enable/Disable scavenging of the read-only space. (defvar *scavenge-read-only-space* nil) + +;; Not really necessary (AFAICT), but nice to have around. The +;; compiler will normally use vops to implement these functions. + +(defun fused-multiply-subtract (x y z) + "Compute x*y-z with only one rounding operation" + (declare (double-float x y z)) + (fused-multiply-subtract x y z)) + +(defun fused-multiply-add (x y z) + "Compute x*y+z with only one rounding operation" + (declare (double-float x y z)) + (fused-multiply-add x y z)) + -- GitLab