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The postRA scheduler performs alias analysis to determine if stores and loads can moved past each other. When a function has more arguments than argument registers for the calling convention used, excess arguments are spilled onto the stack. LLVM by default assumes that argument slots are immutable, unless the function contains a tail call. Without the knowledge of that a function contains a tail call site, stores and loads to fixed stack slots may be re-ordered causing the out-going arguments to clobber the incoming arguments before the incoming arguments are supposed to be dead. Reviewers: vkalintiris Differential Review: https://reviews.llvm.org/D24077 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@282063 91177308-0d34-0410-b5e6-96231b3b80d8 |
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