[PATCH] D137233: Add support for the BranchRelaxation pass
Xiaodong Liu via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Nov 2 01:22:05 PDT 2022
XiaodongLoong created this revision.
Herald added subscribers: hiraditya, arichardson.
Herald added a project: All.
XiaodongLoong requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.
When the branch target is out of the range represented by the current
branch instruction's immediate, branch relaxation is required. There
are three types of immediate for branch instructions on LoongArch,
including simm16, simm21 and simm26. And the real branch target
address is PC + sext(simmXX << 2). In addition, the indirect branch
way is implemented to support larger branch target.
BranchRelaxation pass calls `RenumberBlocks` to renumber all of the
machine basic blocks in the function. So the machine basic blocks
number changed in some test cases.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D137233
Files:
llvm/lib/Target/LoongArch/LoongArchInstrInfo.cpp
llvm/lib/Target/LoongArch/LoongArchInstrInfo.h
llvm/lib/Target/LoongArch/LoongArchTargetMachine.cpp
llvm/test/CodeGen/LoongArch/analyze-branch.ll
llvm/test/CodeGen/LoongArch/branch-relaxation.ll
llvm/test/CodeGen/LoongArch/exception-pointer-register.ll
llvm/test/CodeGen/LoongArch/jump-table.ll
llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/loongarch_generated_funcs.ll.generated.expected
llvm/test/tools/UpdateTestChecks/update_llc_test_checks/Inputs/loongarch_generated_funcs.ll.nogenerated.expected
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D137233.472529.patch
Type: text/x-patch
Size: 17890 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20221102/3c1edd02/attachment.bin>
More information about the llvm-commits
mailing list