[PATCH 16/25] Fix IRA ICE.

ams@codesourcery.com ams@codesourcery.com
Wed Sep 5 11:51:00 GMT 2018


The IRA pass makes an assumption that any pseudos created after the pass begins
were created explicitly by the pass itself and therefore will have
corresponding entries in its other tables.

The GCN back-end, however, often creates additional pseudos, in expand
patterns, to represent the necessary EXEC value, and these break IRA's
assumption and cause ICEs.

This patch simply has IRA skip unknown pseudos, and the problem goes away.

Presumably, it's not ideal that these registers have not been processed by IRA,
but it does not appear to do any real harm.

2018-09-05  Andrew Stubbs  <ams@codesourcery.com>

	gcc/
	* ira.c (setup_preferred_alternate_classes_for_new_pseudos): Skip
	pseudos not created by this pass.
	(move_unallocated_pseudos): Likewise.
---
 gcc/ira.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

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