clarify -malign-double situation

From-SVN: r26555

diff --git a/gcc/f/ChangeLog b/gcc/f/ChangeLog
index 8cfae68..fb17af4 100644 (file)
--- a/gcc/f/ChangeLog
+++ b/gcc/f/ChangeLog
@@ -1,3 +1,7 @@
+Tue Apr 20 01:38:57 1999  Craig Burley  <craig@jcb-sc.com>
+
+       * bugs.texi, news.texi: Clarify -malign-double situation.
+
 Tue Apr 20 01:15:25 1999  Craig Burley  <craig@jcb-sc.com>
 
        * stb.c (ffestb_R5282_): Convert DATA repeat count

diff --git a/gcc/f/bugs.texi b/gcc/f/bugs.texi
index 3d4e791..c9a486c 100644 (file)
--- a/gcc/f/bugs.texi
+++ b/gcc/f/bugs.texi
@@ -9,7 +9,7 @@
 @c in the standalone derivations of this file (e.g. BUGS).
 @set copyrights-bugs 1995-1999
 
-@set last-update-bugs 1999-04-17
+@set last-update-bugs 1999-04-20
 
 @include root.texi
 
@@ -265,42 +265,6 @@ of specifications of alignment requirements and preferences for targets,
 and front ends like @code{g77} should take advantage of this
 when it becomes available.
 
-@cindex alignment
-@cindex double-precision performance
-@cindex -malign-double
-@item
-The x86 target's @samp{-malign-double} option
-no longer reliably aligns double-precision variables and arrays
-when they are placed in the stack frame.
-
-This can significantly reduce the performance of some applications,
-even on a run-to-run basis
-(that is, performance measurements can vary fairly widely
-depending on whether frequently used variables are properly aligned,
-and that can change from one program run to the next,
-even from one procedure call to the next).
-
-Versions 0.5.22 and earlier of @code{g77}
-included a patch to @code{gcc} that enabled this,
-but that patch has been deemed an improper (probably buggy) one
-for version 2.8 of @code{gcc} and for @code{egcs}.
-
-Note that version 1.1 of @code{egcs}
-aligns double-precision variables and arrays
-when they are in static storage
-even if @samp{-malign-double} is not specified.
-
-There is ongoing investigation into
-how to make @samp{-malign-double} work properly,
-also into how to make it unnecessary to get
-all double-precision variables and arrays aligned
-when such alignment would not violate
-the relevant specifications for processor
-and inter-procedural interfaces.
-
-For a suite of programs to test double-precision alignment,
-see @uref{ftp://alpha.gnu.org/gnu/g77/align/}.
-
 @cindex complex performance
 @cindex aliasing
 @item

diff --git a/gcc/f/news.texi b/gcc/f/news.texi
index 52d03d6..37acb1c 100644 (file)
--- a/gcc/f/news.texi
+++ b/gcc/f/news.texi
@@ -225,6 +225,12 @@ now reliably aligns @emph{all} double-precision variables and arrays
 on Intel x86 targets.
 
 @item
+Even without the @samp{-malign-double} option,
+@code{g77} reliably aligns local double-precision variables
+that are not in @code{EQUIVALENCE} areas
+and not @code{SAVE}'d.
+
+@item
 A substantial portion of the @code{g77} front end's code-generation component
 was rewritten.
 It now generates code using facilities more robustly supported