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2f44405590
Introduce three pseudo instructions to be used during DAG ISel to represent v8.1-m low-overhead loops. One maps to set_loop_iterations while loop_decrement_reg is lowered to two, so that we can separate the decrement and branching operations. The pseudo instructions are expanded pre-emission, where we can still decide whether we actually want to generate a low-overhead loop, in a new pass: ARMLowOverheadLoops. The pass currently bails, reverting to an sub, icmp and br, in the cases where a call or stack spill/restore happens between the decrement and branching instructions, or if the loop is too large. Differential Revision: https://reviews.llvm.org/D63476 llvm-svn: 364288 |
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