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3 Commits

Author SHA1 Message Date
Alex Bradbury 7d6aa1f7ae [RISCV] Implement frame pointer elimination 
llvm-svn: 322839
 2018-01-18 11:34:02 +00:00
Alex Bradbury 315cd3ace4 [RISCV] Implement support for the BranchRelaxation pass 
Branch relaxation is needed to support branch displacements that overflow the
instruction's immediate field.

Differential Revision: https://reviews.llvm.org/D40830

llvm-svn: 322224
 2018-01-10 21:05:07 +00:00
Alex Bradbury e027c93ac2 [RISCV] Implement branch analysis 
This is a prerequisite for the branch relaxation pass, and allows a number of
optimisation passes (e.g. BranchFolding and MachineBlockPlacement) to work.

Differential Revision: https://reviews.llvm.org/D40808

llvm-svn: 322222
 2018-01-10 20:47:00 +00:00