[PATCH] D17680: [X86][SSE] Lower 128-bit MOVDDUP with existing VBROADCAST mechanisms
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Sat Feb 27 03:48:40 PST 2016
RKSimon created this revision.
RKSimon added reviewers: delena, spatel, andreadb.
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We have a number of useful lowering strategies for VBROADCAST instructions (both from memory and register element 0) which the 128-bit form of the MOVDDUP instruction can make use of.
This patch tweaks lowerVectorShuffleAsBroadcast to enable it to broadcast 2f64 args using MOVDDUP as well.
It does require a slight tweak to the lowerVectorShuffleAsBroadcast mechanism as the existing MOVDDUP lowering uses isShuffleEquivalent which can match binary shuffles that can lower to (unary) broadcasts.
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