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Add updated sparc example from lightning 1.2c documentation.

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* doc/body.texi: Add back the SPARC code generation example.
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pcpa 2013-02-19 22:10:35 -03:00
parent e6a14a61eb
commit 678e72484c
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@ -1,3 +1,7 @@
2013-02-19 Paulo Andrade <pcpa@gnu.org>
* doc/body.texi: Add back the SPARC code generation example.
2013-02-19 Paulo Andrade <pcpa@gnu.org> 2013-02-19 Paulo Andrade <pcpa@gnu.org>
* check/lightning.c: Remove state flag to work with partial * check/lightning.c: Remove state flag to work with partial

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doc/body.texi
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@ -710,10 +710,27 @@ code for these instructions. The client program has the responsibility
of describing the code to be generated using the standard @lightning{} of describing the code to be generated using the standard @lightning{}
instruction set. instruction set.
Let's examine the code generated for @code{incr} on the x86_64 Let's examine the code generated for @code{incr} on the SPARC and x86_64
architecture (on the right is the code that an assembly-language architecture (on the right is the code that an assembly-language
programmer would write): programmer would write):
@table @b
@item SPARC
@example
save %sp, -112, %sp
mov %i0, %g2 ret
inc %g2 inc %i0
mov %g2, %i0
restore
retl
nop
@end example
In this case, @lightning{} introduces overhead to create a register
window (not knowing that the procedure is a leaf procedure) and to
move the argument to the general purpose register @code{R0} (which
maps to @code{%g2} on the SPARC).
@end table
@table @b @table @b
@item x86_64 @item x86_64
@example @example