[LLVM][XTHeadVector] Add RedundantVSETVLIElimination pass to remove unnecessary vtype-preserving sequences
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<backup-vtype>-<action>-<restore-vtype> where <action> has no side effiectRedundantVSETVLIElimination pass to remove unnecessary vtype-preserving sequences
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This pass removes code sequences like: ``` csrr <r1>, vl csrr <r2>, vtype <a lot of th.vsetvl/th.vsetvli> th.vsetvl zero, <r1>, <r2> ```
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… unnecessary vtype-preserving sequences (ruyisdk#99) * [LLVM][XTHeadVector] Initial `RedundantVSETVLIElimination` pass * [LLVM][XTHeadVector] `RedundantVSETVLIElimination` This pass removes code sequences like: ``` csrr <r1>, vl csrr <r2>, vtype <a lot of th.vsetvl/th.vsetvli> th.vsetvl zero, <r1>, <r2> ``` * [LLVM][XTHeadVector] Update tests * [LLVM][XTHeadVector] Update tests * [LLVM][XTHeadVector] Fix comments * [LLVM][XTHeadVector] Fix comments * [LLVM][XTHeadVector] More comments * [LLVM][XTHeadVector] Update tests * [LLVM][XTHeadVector] add option `riscv-enable-vsetvli-elim`
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… unnecessary vtype-preserving sequences (ruyisdk#99) * [LLVM][XTHeadVector] Initial `RedundantVSETVLIElimination` pass * [LLVM][XTHeadVector] `RedundantVSETVLIElimination` This pass removes code sequences like: ``` csrr <r1>, vl csrr <r2>, vtype <a lot of th.vsetvl/th.vsetvli> th.vsetvl zero, <r1>, <r2> ``` * [LLVM][XTHeadVector] Update tests * [LLVM][XTHeadVector] Update tests * [LLVM][XTHeadVector] Fix comments * [LLVM][XTHeadVector] Fix comments * [LLVM][XTHeadVector] More comments * [LLVM][XTHeadVector] Update tests * [LLVM][XTHeadVector] add option `riscv-enable-vsetvli-elim`
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In #38 we generated prologue and epilogue for COPY nodes, which looks like:
After pass
RedundantCopyElimination, some<COPY-node>will be removed from the basic block, thus the sequence becomes:And this PR added a new pass
RedundantVSETVLIEliminationto remove the above sequence pattern.NOTE: this PR is based on #98, so it should be merged before this one 😉
/cc @AinsleySnow