[cmucl-commit] [git] CMU Common Lisp branch master updated. snapshot-2012-05-3-gc4ee759
Raymond Toy
rtoy at common-lisp.net
Fri May 25 03:27:44 UTC 2012
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- Log -----------------------------------------------------------------
commit c4ee759adf765707fba62c154315f0ed3e9036db
Author: Raymond Toy <toy.raymond at gmail.com>
Date: Thu May 24 20:27:37 2012 -0700
Clear matching current exceptions when enabling new exceptions. This
prevents the exception from being resignaled immediately.
src/code/float-trap.lisp:
o Clear current and accrued exception bits that match any new enabled
exceptions specified by :traps.
src/general-info/release-20d.txt:
o Update.
diff --git a/src/code/float-trap.lisp b/src/code/float-trap.lisp
index d800e14..6616146 100644
--- a/src/code/float-trap.lisp
+++ b/src/code/float-trap.lisp
@@ -155,7 +155,19 @@
currently in effect."
(let ((modes (floating-point-modes)))
(when traps-p
- (setf (ldb float-traps-byte modes) (float-trap-mask traps)))
+ (let ((trap-mask-bits (float-trap-mask traps)))
+ (setf (ldb float-traps-byte modes) trap-mask-bits)
+ #+(and x86 sse2)
+ (progn
+ ;; Clear out any current or accrued exceptions that match
+ ;; the traps that we are enabling. If we don't then
+ ;; enabling the traps causes the exceptions to be signaled
+ ;; immediately. This is a bit annoying. If the user really
+ ;; wants to resignal the exceptions, he can do that himself.
+ (setf (ldb float-sticky-bits modes)
+ (logandc2 (ldb float-sticky-bits modes) trap-mask-bits))
+ (setf (ldb float-exceptions-byte modes)
+ (logandc2 (ldb float-exceptions-byte modes) trap-mask-bits)))))
(when round-p
(setf (ldb float-rounding-mode modes)
(or (cdr (assoc rounding-mode rounding-mode-alist))
@@ -175,6 +187,7 @@
(when (member :invalid current-exceptions)
;; Clear out the bits for the detected invalid operation
(setf (ldb vm:float-invalid-op-1-byte modes) 0)))
+
(when fast-mode-p
(if fast-mode
(setq modes (logior float-fast-bit modes))
diff --git a/src/general-info/release-20d.txt b/src/general-info/release-20d.txt
index 0a5c224..9dbf560 100644
--- a/src/general-info/release-20d.txt
+++ b/src/general-info/release-20d.txt
@@ -42,7 +42,14 @@ New in this release:
* Updated to Unicode 6.1.0.
* Many additional aliases for external formats added that match
the glibc iconv aliases.
- * Implement faster LOGCOUNT function, if :SSE3 feature is available.
+ * Implement faster LOGCOUNT function on x86, if :SSE3 feature is
+ available. (Only applies to new uses of LOGCOUNT. The core
+ uses the default version.)
+ * On x86, SET-FLOATING-POINT-MODES clears any current and accrued
+ exceptions that match exceptions in :TRAPS. Previously,
+ enabling a trap when the current exception also listed that trap
+ caused the exception to be immediately signaled. This no longer
+ happens and now matches how ppc and sparc behave.
* ANSI compliance fixes:
* CMUCL was not printing pathnames like (make-pathname :directory
-----------------------------------------------------------------------
Summary of changes:
src/code/float-trap.lisp | 15 ++++++++++++++-
src/general-info/release-20d.txt | 9 ++++++++-
2 files changed, 22 insertions(+), 2 deletions(-)
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