http://llvm.org/bugs/show_bug.cgi?id=10581
Summary: [AVX] vector shifts are scalarized
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Given:
define <8 x i32> @foo___ff(<8 x i32> %a, <8 x i32> %b) nounwind readnone {
%s = shl <8 x i32> %a, <i32 2, i32 2, i32 2, i32 2, i32 2, i32 2, i32 2, i32
2>
ret <8 x i32> %s
}
llc -mattr=+avx deconstructs the vector into elements, shifts each one
individually, and reconstructs the vector. It'd be nice if it just used the
corresponding AVX vector shift instruction for this.
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