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authorBob Wilson <bob.wilson@acm.org>2008-01-25 01:08:34 +0000
committerBob Wilson <bob.wilson@acm.org>2008-01-25 01:08:34 +0000
commitcec28c98152d659107cb32d270cd81e3fb0274ff (patch)
treead4bda809991294102e7e440e49d7f887f5bceb7 /gas
parent244e85c8dfd6144c3db4648dc9c9c5b569067d49 (diff)
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* doc/c-xtensa.texi (Xtensa Syntax): Clarify handling of opcodes that
can only be encoded in FLIX instructions but are not specified as such. (Xtensa Automatic Alignment): Remove obsolete comment about debugging labels.
Diffstat (limited to 'gas')
-rw-r--r--gas/ChangeLog7
-rw-r--r--gas/doc/c-xtensa.texi12
2 files changed, 12 insertions, 7 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog
index 3b3a922..f5334ea 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,10 @@
+2008-01-24 Bob Wilson <bob.wilson@acm.org>
+
+ * doc/c-xtensa.texi (Xtensa Syntax): Clarify handling of opcodes that
+ can only be encoded in FLIX instructions but are not specified as such.
+ (Xtensa Automatic Alignment): Remove obsolete comment about debugging
+ labels.
+
2008-01-24 H.J. Lu <hongjiu.lu@intel.com>
* NEWS: Mention new command line options for x86 targets.
diff --git a/gas/doc/c-xtensa.texi b/gas/doc/c-xtensa.texi
index bc1f48e..e07eefe 100644
--- a/gas/doc/c-xtensa.texi
+++ b/gas/doc/c-xtensa.texi
@@ -144,10 +144,10 @@ specified on a single line by separating the opcodes with semicolons:
@{ [@var{format};] @var{opcode0} [@var{operands}]; @var{opcode1} [@var{operands}]; @var{opcode2} [@var{operands}]; @dots{} @}
@end smallexample
-The assembler can automatically bundle opcodes into FLIX instructions.
-It encodes the opcodes in order, one at a time,
-choosing the smallest format where each opcode can be encoded and
-filling unused instruction slots with no-ops.
+If an opcode can only be encoded in a FLIX instruction but is not
+specified as part of a FLIX bundle, the assembler will choose the
+smallest format where the opcode can be encoded and
+will fill unused instruction slots with no-ops.
@menu
* Xtensa Opcodes:: Opcode Naming Conventions.
@@ -255,9 +255,7 @@ instruction fetch widths.) An
instruction immediately following a call is treated as a branch target
in this context, because it will be the target of a return from the
call. This alignment has the potential to reduce branch penalties at
-some expense in code size. The assembler will not attempt to align
-labels with the prefixes @code{.Ln} and @code{.LM}, since these labels
-are used for debugging information and are not typically branch targets.
+some expense in code size.
This optimization is enabled by default. You can disable it with the
@samp{--no-target-@-align} command-line option (@pxref{Xtensa Options,
,Command Line Options}).