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extend.texi: Clarify some issues related to local variables assigned to explicit registers.

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* extend.texi: Clarify some issues related to local variables
        assigned to explicit registers.

From-SVN: r21159
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Jeffrey A Law 1998-07-14 19:59:53 +00:00 • committed by Jeff Law
parent 2c43b71ae5
commit 0deaf5908c
2 changed files with 10 additions and 1 deletions
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gcc/ChangeLog
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@ -6,6 +6,9 @@ Tue Jul 14 14:15:30 1998 Nick Clifton <nickc@cygnus.com>
Tue Jul 14 14:46:08 1998 Jeffrey A Law (law@cygnus.com)
* extend.texi: Clarify some issues related to local variables
assigned to explicit registers.
* mn10300.md (mulsi): Turn into expander + pattern.
* mn10300.md (movsi, movsf, movdi, movdf): Remove "x" from I -> a

8
gcc/extend.texi
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@ -2593,7 +2593,9 @@ very often.
Local register variables in specific registers do not reserve the
registers. The compiler's data flow analysis is capable of determining
where the specified registers contain live values, and where they are
available for other uses.
available for other uses. Stores into local register variables may deleted
when they appear to be dead according to dataflow analysis. References
to local register variables may be deleted or moved or simplified.
These local variables are sometimes convenient for use with the extended
@code{asm} feature (@pxref{Extended Asm}), if you want to write one
@ -2744,6 +2746,10 @@ this variable in the register you specify at all times. You may not
code an explicit reference to this register in an @code{asm} statement
and assume it will always refer to this variable.
Stores into local register variables may deleted when they appear to be dead
according to dataflow analysis. References to local register variables may
be deleted or moved or simplified.
@node Alternate Keywords
@section Alternate Keywords
@cindex alternate keywords