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2016 May 18
3
sum elements in the vector
Hi Rail,
We used a very simple pattern expansion (actually, not a pattern fragment). For example, for AND, ADD (horizontal sum), OR and XOR of 4 elements we use something like the following TableGen structure:
class HORIZ_Op4<SDNode opc, RegisterClass regVT, ValueType rt, ValueType vt, string asmstr> :
SHAVE_Instr<(outs regVT:$dst), (ins VRF128:$src),