Hal Finkel 014b06e7b2 Handle early-clobber registers in the aggressive anti-dep breaker
The aggressive anti-dep breaker, used by the PowerPC backend during post-RA
scheduling (but is available to all targets), did not handle early-clobber MI
operands (at all). When constructing the list of available registers for the
replacement of some def operand, check the using instructions, and remove
registers assigned to early-clobbered defs from the set.

Fixes PR21452.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223727 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-09 01:00:59 +00:00
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