The following patch fixes
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65647
This very complicated problem occurred in rare cases when chain of
reloads involving at least two pseudos and insns were generated and one
pseudo was spilled on later sub-passes after spilling sub-pass and this
pattern happened to be repeated.
The patch was bootstrapped and tested on x86/x86-64, ppc64, and aarch64.
Committed as rev.221867.
2015-04-04 Vladimir Makarov <vmaka...@redhat.com>
PR target/65647
* lra-int.h (LRA_MAX_REMATERIALIZATION_PASSES): New. Add its
value checking.
(lra_rematerialization_iter): New.
* lra.c (lra): Initialize lra_rematerialization_iter.
Stop updating lra_constraint_new_regno_start after switching of
inheritance and rematerialization.
* lra-remat.c (lra_rematerialization_iter): New.
(lra_remat): Add printing pass iteration. Do rematerialization
only first LRA_MAX_REMATERIALIZATION_PASSES iterations.
2015-04-04 Vladimir Makarov <vmaka...@redhat.com>
PR target/65647
* gcc.target/arm/pr65647.c: New.
