Hao Liu
5be64c403b
[ARM] Lower interleaved memory accesses to vldN/vstN intrinsics.
This patch also adds a function to calculate the cost of interleaved memory accesses.
E.g. Lower an interleaved load:
%wide.vec = load <8 x i32>, <8 x i32>* %ptr, align 4
%v0 = shuffle %wide.vec, undef, <0, 2, 4, 6>
%v1 = shuffle %wide.vec, undef, <1, 3, 5, 7>
into:
%vld2 = { <4 x i32>, <4 x i32> } call llvm.arm.neon.vld2(%ptr, 4)
%vec0 = extractelement { <4 x i32>, <4 x i32> } %vld2, i32 0
%vec1 = extractelement { <4 x i32>, <4 x i32> } %vld2, i32 1
E.g. Lower an interleaved store:
%i.vec = shuffle <8 x i32> %v0, <8 x i32> %v1, <0, 4, 8, 1, 5, 9, 2, 6, 10, 3, 7, 11>
store <12 x i32> %i.vec, <12 x i32>* %ptr, align 4
into:
%sub.v0 = shuffle <8 x i32> %v0, <8 x i32> v1, <0, 1, 2, 3>
%sub.v1 = shuffle <8 x i32> %v0, <8 x i32> v1, <4, 5, 6, 7>
%sub.v2 = shuffle <8 x i32> %v0, <8 x i32> v1, <8, 9, 10, 11>
call void llvm.arm.neon.vst3(%ptr, %sub.v0, %sub.v1, %sub.v2, 4)
Differential Revision: http://reviews.llvm.org/D10533
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240755 91177308-0d34-0410-b5e6-96231b3b80d8
2015-06-26 02:45:36 +00:00
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