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Mirror of https://github.com/RPCS3/llvm-mirror
75855c772b
This patch makes the following changes to the schedule of instructions in the prologue and epilogue. The stack pointer update is moved down in the prologue so that the callee saves do not have to wait for the update to happen. Saving the lr is moved down in the prologue to hide the latency of the mflr. The stack pointer is moved up in the epilogue so that restoring of the lr can happen sooner. The mtlr is moved up in the epilogue so that it is away form the blr at the end of the epilogue. The latency of the mtlr can now be hidden by the loads of the callee saved registers. Differential Revision: https://reviews.llvm.org/D41737 llvm-svn: 322036 |
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