Displaying 2 results from an estimated 2 matches for "shave_instr".
2016 May 18
3
sum elements in the vector
...ery 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),
!strconcat(asmstr, " $dst $src"),
[(set regVT:$dst,
(opc (rt (vector_extract(vt VRF128:$src), 0 ) ),
(opc (rt (vector_extract(vt VRF128:$src), 1 ) ),...
2016 May 16
4
sum elements in the vector
This would be really cool. We have several instructions that perform horizontal vector operations, and have to use built-ins to select them as there is no easy way of expressing them in a TD file. Some like SUM for a ‘v4i32’ are easy enough to express with a pattern fragment, SUM ‘v8i16’ takes TableGen a long time to compute, but SUM ‘v16i8’ resulted in TableGen disappearing into itself for