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Commit 9ce19fb6 authored by Chad Rosier's avatar Chad Rosier
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[AArch64] Implement the isTruncateFree API. 

In AArch64 i64 to i32 truncate operation is a subregister access.

This allows more opportunities for LSR optmization to eliminate
variables of different types (i32 and i64).

llvm-svn: 205925
parent 2a24e3ad
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