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Author SHA1 Message Date
Jakob Stoklund Olesen d9b427ee65 Add <imp-def> operands when reloading into physregs. 
When an instruction only writes sub-registers, it is still necessary to
add an <imp-def> operand for the super-register.  When reloading into a
virtual register, rewriting will add the operand, but when loading
directly into a virtual register, the <imp-def> operand is still
necessary.

llvm-svn: 152095
 2012-03-06 02:48:17 +00:00
Jakob Stoklund Olesen f729ceae04 Use <def,undef> operands when spilling NEON bundles. 
MachineOperands that define part of a virtual register must have an
<undef> flag if they are not intended as read-modify-write operands.

The old trick of adding an <imp-def> operand doesn't work any longer.

Fixes PR12177.

llvm-svn: 152008
 2012-03-04 18:40:30 +00:00