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Docuement that CONSITIONAL_REGISTER_USAGE can modify reg_names.

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From-SVN: r34239
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Nick Clifton 2000-05-28 21:08:51 +00:00 committed by Nick Clifton
parent 9ef07cf1d4
commit 055177dc83
2 changed files with 13 additions and 7 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-05-28 Nick Clifton <nickc@cygnus.com>
* tm.texi (CONDITIONAL_REGISTER_USAGE): Document that it can
modify reg_names.
2000-05-28 Richard Henderson <rth@cygnus.com>
* regclass.c (record_operand_costs): Protect reg_changes_size

15
gcc/tm.texi
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@ -1406,14 +1406,15 @@ preserve the entire contents of a register across a call.
@findex fixed_regs
@findex call_used_regs
@item CONDITIONAL_REGISTER_USAGE
Zero or more C statements that may conditionally modify four variables
@code{fixed_regs}, @code{call_used_regs}, @code{global_regs}
(these three are of type @code{char []}) and @code{reg_class_contents}
(of type @code{HARD_REG_SET}).
Zero or more C statements that may conditionally modify five variables
@code{fixed_regs}, @code{call_used_regs}, @code{global_regs},
(these three are of type @code{char []}), @code{reg_names} (of type
@code{const char * []}) and @code{reg_class_contents} (of type
@code{HARD_REG_SET}).
Before the macro is called @code{fixed_regs}, @code{call_used_regs}
and @code{reg_class_contents} have been initialized from
@code{FIXED_REGISTERS}, @code{CALL_USED_REGISTERS} and
@code{REG_CLASS_CONTENTS}, respectively,
@code{reg_class_contents} and @code{reg_names} have been initialized
from @code{FIXED_REGISTERS}, @code{CALL_USED_REGISTERS},
@code{REG_CLASS_CONTENTS} and @code{REGISTER_NAMES}, respectively,
@code{global_regs} has been cleared, and any @samp{-ffixed-@var{reg}},
@samp{-fcall-used-@var{reg}} and @samp{-fcall-saved-@var{reg}} command
options have been applied.