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Commit e238a4c7 authored by Than McIntosh's avatar Than McIntosh
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[X86] for split stack, not save/restore nested arg if unused

Summary:
For split-stack, if the nested argument (i.e. R10) is not used, no need to save/restore it in the prologue.

Reviewers: thanm

Reviewed By: thanm

Subscribers: mstorsjo, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D64673

llvm-svn: 366569
parent 20a0e7ca
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