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Add a instruction flag: hasPostISelHook which tells the pre-RA scheduler to call a target hook to adjust the instruction. For ARM, this is used to adjust instructions which may be setting the 's' flag. ADC, SBC, RSB, and RSC instructions have implicit def of CPSR (required since it now uses CPSR physical register dependency rather than "glue"). If the carry flag is used, then the target hook will *fill in* the optional operand with CPSR. Otherwise, the hook will remove the CPSR implicit def from the MachineInstr. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138810 91177308-0d34-0410-b5e6-96231b3b80d8 |
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