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Add more documentation about h8300 relaxation.

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Nick Clifton 2004-04-21 10:47:13 +00:00
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commit 1502569cf9
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6
ld/ChangeLog
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@ -1,3 +1,9 @@
2004-04-21 Anil Paranjpe <anilp1@kpitcummins.com>
* ld.texinfo (synthesizing on H8/300): Information about linker
relaxation support for bit manipulation instructions and system
control instructions is added.
2004-04-21 Hans-Peter Nilsson <hp@axis.com>
* NEWS: Mention change in DEFINED semantics.

17
ld/ld.texinfo
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@ -4655,6 +4655,23 @@ page of memory, and changes them to use the eight-bit address form.
(That is: the linker turns @samp{mov.b @code{@@}@var{aa}:16} into
@samp{mov.b @code{@@}@var{aa}:8} whenever the address @var{aa} is in the
top page of memory).
@item bit manipulation instructions
@command{ld} finds all bit manipulation instructions like @code{band, bclr,
biand, bild, bior, bist, bixor, bld, bnot, bor, bset, bst, btst, bxor}
which use 32 bit and 16 bit absolute address form, but refer to the top
page of memory, and changes them to use the 8 bit address form.
(That is: the linker turns @samp{bset #xx:3,@code{@@}@var{aa}:32} into
@samp{bset #xx:3,@code{@@}@var{aa}:8} whenever the address @var{aa} is in
the top page of memory).
@item system control instructions
@command{ld} finds all @code{ldc.w, stc.w} instrcutions which use the
32 bit absolute address form, but refer to the top page of memory, and
changes them to use 16 bit address form.
(That is: the linker turns @samp{ldc.w @code{@@}@var{aa}:32,ccr} into
@samp{ldc.w @code{@@}@var{aa}:16,ccr} whenever the address @var{aa} is in
the top page of memory).
@end table
@ifclear GENERIC