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[DAGCombine] Produce better code for constant splats
authorMichael Kuperstein <michael.m.kuperstein@intel.com>
Thu, 22 Jan 2015 12:37:23 +0000 (12:37 +0000)
committerMichael Kuperstein <michael.m.kuperstein@intel.com>
Thu, 22 Jan 2015 12:37:23 +0000 (12:37 +0000)
commit84fad3e5c9f75710ad1f43198c6e136e7cdb46b4
tree04d9c0d679cd5d5c911e13c5b9350e472055cdcbtree | snapshot
parentfebfd3453ec975887ef2370fa4b9a6a9a6757950commit | diff
[DAGCombine] Produce better code for constant splats

This solves PR22276.
Splats of constants would sometimes produce redundant shuffles, sometimes ridiculously so (see the PR for details). Fold these shuffles into BUILD_VECTORs early on instead.

Differential Revision: http://reviews.llvm.org/D7093

llvm-svn: 226811
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp diff | blob | history
llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp diff | blob | history
llvm/test/CodeGen/X86/splat-const.ll [new file with mode: 0644] blob
llvm/test/CodeGen/X86/sse41.ll diff | blob | history
llvm/test/CodeGen/X86/widen_shuffle-1.ll diff | blob | history
Domain: System / Toolchain;