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Juergen Ributzka
a0af4b0271
[FastISel][AArch64] Fold sign-/zero-extends into the load instruction.
The sign-/zero-extension of the loaded value can be performed by the memory instruction for free. If the result of the load has only one use and the use is a sign-/zero-extend, then we emit the proper load instruction. The extend is only a register copy and will be optimized away later on. Other instructions that consume the sign-/zero-extended value are also made aware of this fact, so they don't fold the extend too. This fixes rdar://problem/18495928. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218653 91177308-0d34-0410-b5e6-96231b3b80d8
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