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[AArch64] Add nvcast patterns for v2f32 -> v1f64

Authored by sepavloff on May 23 2019, 6:20 PM.

Description

[AArch64] Add nvcast patterns for v2f32 -> v1f64

Summary: Constant stores of f32 values can create such NvCast nodes.

Reviewers: t.p.northover

Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62285

llvm-svn: 361584

Details