[LLVMbugs] [Bug 7980] RegAllocFast doesn't set correctly kill flag on implicit use registers

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Tue Aug 31 14:54:42 PDT 2010


Jakob Stoklund Olesen <stoklund at 2pi.dk> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #2 from Jakob Stoklund Olesen <stoklund at 2pi.dk> 2010-08-31 16:54:42 CDT ---
Fixed in r112650, but probably not in the way you were hoping.

%EFLAGS is changed to be an unallocatable register, so RegAllocFast leaves it

Kill flags should be conservatively correct after RegAllocFast. THat means kill
flags may be missing, but when a kill flag is present, it should be correct.
That is enough to make the register scavenger and machine code verifier happy.

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