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This patch adds support for sign extension for sub 128-bit vectors, such as to v2i32. It concatenates with UNDEF subvectors up to 128-bits, performs the sign extension (i.e. as v4i32) and then extracts the target subvector. Patch 1/2 of D10589 - the second patch covers the conversion of v2i8/v2i16 to v2f64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241323 91177308-0d34-0410-b5e6-96231b3b80d8
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