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fcf8735ea4
Re-apply r288561: This time with a fix where the ADDs that are part of a 3 instruction LOH would not invalidate the "LastAdrp" state. This fixes http://llvm.org/PR31361 Previously this pass was using up to 5% compile time in some cases which is a bit much for what it is doing. The pass featured a full blown data-flow analysis which in the default configuration was restricted to a single block. This rewrites the pass under the assumption that we only ever work on a single block. This is done in a single pass maintaining a state machine per general purpose register to catch LOH patterns. Differential Revision: https://reviews.llvm.org/D27329 This reverts commit 9e6cedb0a4f14364d6511597a9160305e7d34493. llvm-svn: 291266 |
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