contributions from many people at Google, as well as:

1ndig0, 372046933, abhinav, afzpatel, Akhil Goel, Alain Carlucci, Aleksei, Alen Huang, Alex, Amrinfathima-Mcw, Aravindh Balaji, Armand Picard, Aseem Athale, Ashiq Imran, Assoap, Chao, Chase Riley Roberts, Chenhao Jiang, chunhsue, chuntl, Chunyu Jin, Corentin Kerisit, Crefeda Rodrigues, dependabot[bot], Dragan Mladjenovic, Elen Kalda, Felix Thomasmathibalan, gabeweisz, Gauri Deshpande, Georg Stefan Schmid, Guozhong Zhuang, Harsha H S,...

XH1 // H^2.hi·H^2.hi VPMSUMD XL, XC2, T2 // 1st reduction phase VPMSUMD XL1, XC2, HH // 1st reduction phase VSLDOI $8, XM, ZERO, T0 VSLDOI $8, ZERO, XM, T1 VSLDOI $8, XM1, ZERO, HL VSLDOI $8, ZERO, XM1, H VXOR XL, T0, XL VXOR XH, T1, XH VXOR XL1, HL, XL1 VXOR XH1, H, XH1 VSLDOI $8, XL, XL, XL VSLDOI $8, XL1, XL1, XL1 VXOR XL, T2, XL VXOR XL1, HH, XL1 VSLDOI $8, XL, XL, T1 // 2nd reduction phase VSLDOI $8, XL1, XL1, H // 2nd reduction phase VPMSUMD XL, XC2, XL VPMSUMD XL1, XC2, XL1 VXOR T1, XH, T1...