code_placement_loop_rotation.ll - OpenGrok history log for /llvm-project/llvm/test/CodeGen/X86/code_placement_loop

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# 029a0567	19-Apr-2016	Mandeep Singh Grang <mgrang@codeaurora.org>	[LLVM] Remove unwanted --check-prefix=CHECK from unit tests. NFC. Summary: Removed unwanted --check-prefix=CHECK from numerous unit tests. Reviewers: t.p.northover, dblaikie, uweigand, MatzeB, tste [LLVM] Remove unwanted --check-prefix=CHECK from unit tests. NFC. Summary: Removed unwanted --check-prefix=CHECK from numerous unit tests. Reviewers: t.p.northover, dblaikie, uweigand, MatzeB, tstellarAMD, mcrosier Subscribers: mcrosier, dsanders Differential Revision: http://reviews.llvm.org/D19279 llvm-svn: 266834 show more ...
Revision tags: llvmorg-3.8.0, llvmorg-3.8.0-rc3, llvmorg-3.8.0-rc2, llvmorg-3.8.0-rc1, llvmorg-3.7.1, llvmorg-3.7.1-rc2, llvmorg-3.7.1-rc1
# 7745dbc5	19-Oct-2015	Cong Hou <congh@google.com>	Enhance loop rotation with existence of profile data in MachineBlockPlacement pass. Currently, in MachineBlockPlacement pass the loop is rotated to let the best exit to be the last BB in the loop ch Enhance loop rotation with existence of profile data in MachineBlockPlacement pass. Currently, in MachineBlockPlacement pass the loop is rotated to let the best exit to be the last BB in the loop chain, to maximize the fall-through from the loop to outside. With profile data, we can determine the cost in terms of missed fall through opportunities when rotating a loop chain and select the best rotation. Basically, there are three kinds of cost to consider for each rotation: 1. The possibly missed fall through edge (if it exists) from BB out of the loop to the loop header. 2. The possibly missed fall through edges (if they exist) from the loop exits to BB out of the loop. 3. The missed fall through edge (if it exists) from the last BB to the first BB in the loop chain. Therefore, the cost for a given rotation is the sum of costs listed above. We select the best rotation with the smallest cost. This is only for PGO mode when we have more precise edge frequencies. Differential revision: http://reviews.llvm.org/D10717 llvm-svn: 250754 show more ...