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Document -momit-leaf-frame-pointer for i386
- To: gcc-patches at gcc dot gnu dot org
- Subject: Document -momit-leaf-frame-pointer for i386
- From: Andreas Jaeger <aj at suse dot de>
- Date: 05 May 2001 20:22:32 +0200
The following patch passed make info and documents the
-momit-leaf-frame-pointer option that is so far completly
undocumented.
Ok to commit for both branches?
Andreas
2001-05-05 Andreas Jaeger <aj@suse.de>
* invoke.texi (Option Summary): Add -momit-leaf-frame-pointer
(i386 Options): Document -momit-leaf-frame-pointer.
============================================================
Index: gcc/invoke.texi
--- gcc/invoke.texi 2001/05/04 06:31:23 1.298
+++ gcc/invoke.texi 2001/05/05 18:22:10
@@ -473,7 +473,7 @@
-mpreferred-stack-boundary=@var{num} @gol
-mthreads -mno-align-stringops -minline-all-stringops @gol
-mpush-args -maccumulate-outgoing-args -m128bit-long-double @gol
--m96bit-long-double -mregparm=@var{num}}
+-m96bit-long-double -mregparm=@var{num} -momit-leaf-frame-pointer}
@emph{HPPA Options}
@gccoptlist{
@@ -6924,6 +6924,15 @@
aligned at least to 4 byte boundary. This enables more inlining, increase code
size, but may improve performance of code that depends on fast memcpy, strlen
and memset for short lengths.
+
+@item -momit-leaf-frame-pointer
+@kindex -momit-leaf-frame-pointer
+Don't keep the frame pointer in a register for leaf functions. This
+avoids the instructions to save, set up and restore frame pointers and
+makes an extra register available in leaf functions. The option
+@samp{-fomit-frame-pointer} removes the frame pointer for all functions
+which might makes debugging harder. This option only removes it for
+leaf functions and is in general safe to use.
@end table
@node HPPA Options
--
Andreas Jaeger
SuSE Labs aj@suse.de
private aj@arthur.inka.de
http://www.suse.de/~aj