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tm.texi.in: Spell out that a lack of register class unions can lead to ICEs. 

* doc/tm.texi.in: Spell out that a lack of register class unions
	can lead to ICEs.
	* doc/tm.texi: Regenerate.

From-SVN: r168998
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Joern Rennecke 2011-01-19 15:23:06 +00:00 committed by Joern Rennecke
parent 2e0642cde2
commit b899fd784b
3 changed files with 12 additions and 2 deletions
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@ -1,3 +1,9 @@
2011-01-19 Joern Rennecke <amylaar@spamcop.net>
* doc/tm.texi.in: Spell out that a lack of register class unions
can lead to ICEs.
* doc/tm.texi: Regenerate.
2011-01-19 Jakub Jelinek <jakub@redhat.com>
PR rtl-optimization/47337

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gcc/doc/tm.texi
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@ -2341,7 +2341,9 @@ You should define a class for the union of two classes whenever some
instruction allows both classes. For example, if an instruction allows
either a floating point (coprocessor) register or a general register for a
certain operand, you should define a class @code{FLOAT_OR_GENERAL_REGS}
which includes both of them. Otherwise you will get suboptimal code.
which includes both of them. Otherwise you will get suboptimal code,
or even internal compiler errors when reload cannot find a register in the
the class computed via @code{reg_class_subunion}.
You must also specify certain redundant information about the register
classes: for each class, which classes contain it and which ones are

4
gcc/doc/tm.texi.in
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@ -2331,7 +2331,9 @@ You should define a class for the union of two classes whenever some
instruction allows both classes. For example, if an instruction allows
either a floating point (coprocessor) register or a general register for a
certain operand, you should define a class @code{FLOAT_OR_GENERAL_REGS}
which includes both of them. Otherwise you will get suboptimal code.
which includes both of them. Otherwise you will get suboptimal code,
or even internal compiler errors when reload cannot find a register in the
the class computed via @code{reg_class_subunion}.
You must also specify certain redundant information about the register
classes: for each class, which classes contain it and which ones are