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Diffstat (limited to 'riscv/insns/vgmul_vv.h')
-rw-r--r-- | riscv/insns/vgmul_vv.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/riscv/insns/vgmul_vv.h b/riscv/insns/vgmul_vv.h new file mode 100644 index 0000000..820b396 --- /dev/null +++ b/riscv/insns/vgmul_vv.h @@ -0,0 +1,32 @@ +// vgmul.vv vd, vs2 + +#include "zvk_ext_macros.h" + +require_zvkg; +require(P.VU.vsew == 32); +require_egw_fits(128); + +VI_ZVK_VD_VS2_EGU32x4_NOVM_LOOP( + {}, + { + EGU32x4_t Y = vd; // Multiplier + EGU32x4_BREV8(Y); + EGU32x4_t H = vs2; // Multiplicand + EGU32x4_BREV8(H); + EGU32x4_t Z = {}; + + for (int bit = 0; bit < 128; bit++) { + if (EGU32x4_ISSET(Y, bit)) { + EGU32x4_XOREQ(Z, H); + } + + bool reduce = EGU32x4_ISSET(H, 127); + EGU32x4_LSHIFT(H); // Lef shift by 1 + if (reduce) { + H[0] ^= 0x87; // Reduce using x^7 + x^2 + x^1 + 1 polynomial + } + } + EGU32x4_BREV8(Z); + vd = Z; + } +); |