The llvm.hexagon.M2.mpyd.hl.s1 intrinsic; known as __builtin_HEXAGON_M2_mpyd_hl_s1 in GCC.
See Implementation
The llvm.hexagon.M2.mpyd.hl.s1 intrinsic; known as __builtin_HEXAGON_M2_mpyd_hl_s1 in GCC.