https://bugs.llvm.org/show_bug.cgi?id=35732
Bug ID: 35732
Summary: [DAGCombiner] Remove
reduceBuildVecConvertToConvertBuildVec and rely on the
vectorizers instead
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Common Code Generator Code
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: efrie...@codeaurora.org, hfin...@anl.gov,
llvm-bugs@lists.llvm.org, michael.hl...@gmail.com,
spatel+l...@rotateright.com
reduceBuildVecConvertToConvertBuildVec vectorizes int2float in the DAGCombiner,
which means that even if the LV/SLP has decided to keep scalar code, this will
override this.
While there are cases where vectorization is necessary in the DAG (mainly due
to legalization artefacts), I don't think this is the case here. I think we
should get rid of this and instead assume that the vectorizers know what they
are doing.
SVN blame says this code was added back in 2012.
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