https://bugs.llvm.org/show_bug.cgi?id=37463
Bug ID: 37463
Summary: Failure to scalarize comparison of
unform-op(broadcast) vs broadcast
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: listm...@philipreames.com
CC: llvm-bugs@lists.llvm.org
In the example below, we should be able to replace the sequence with a
broadcast of a scalar comparison:
%52 = insertelement <4 x i64*> undef, i64* %51, i32 0
%53 = shufflevector <4 x i64*> %52, <4 x i64*> undef, <4 x i32>
zeroinitializer
%54 = lshr <4 x i64> %33, <i64 21, i64 21, i64 21, i64 21>
%55 = insertelement <4 x i64> undef, i64 %35, i32 0
%56 = shufflevector <4 x i64> %55, <4 x i64> undef, <4 x i32> zeroinitializer
%57 = icmp eq <4 x i64> %56, %54
Even if we don't get to the scalar form, we definitely should be sinking the
lsr to be a scalar computation before the broadcast given both arguments are
broadcasts of scalars.
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