https://bugs.llvm.org/show_bug.cgi?id=42424
Bug ID: 42424
Summary: shufflevector of load does not reduce load size
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
define <4 x half> @shuffle_v4f16_0101(<4 x half> addrspace(1)* nocapture
readonly %arg0, <4 x half> addrspace(1)* nocapture readnone %arg1) {
%val0 = load <4 x half>, <4 x half> addrspace(1)* %arg0, align 8
%shuffle = shufflevector <4 x half> %val0, <4 x half> undef, <4 x i32> <i32
0, i32 1, i32 0, i32 1>
ret <4 x half> %shuffle
}
I would expect instcombine to recognize that only the low half of the load is
used, and reduce this to a load <2 x half>
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