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The Loop start instruction handled by the ARMLowOverheadLoops are: $lr = t2DoLoopStart $r0 $lr = t2DoLoopStartTP $r1, $r0 $lr = t2WhileLoopStartLR $r0, %bb, implicit-def dead $cpsr All three of these will have LR as the 0 argument, the trip count as the 1 argument. This patch updated a few places in ARMLowOverheadLoops where the 0th arg was being used for t2WhileLoopStartLR instructions as the trip count. One place was entirely removed as it does not seem valid any more, the case the code is trying to protect against should not be able to occur with our correct-by-construction low overhead loops. Differential Revision: https://reviews.llvm.org/D102620 |
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