Add SIMD shuffling instructions

opcodes-shuffling

@@ -0,0 +1,20 @@
+# Floating-point shuffling instructions
+
+# format of a line in this file:
+# <instruction name> <args> <opcode>
+#
+# <opcode> is given by specifying one or more range/value pairs:
+# hi..lo=value or bit=value or arg=value (e.g. 6..2=0x45 10=1 rd=0)
+#
+# <args> is one of rd, rs1, rs2, rs3, aqrl, fm, pred, succ, rm,
+# funct3, imm20, jimm20, imm12, imm12hi, bimm12hi, imm12lo,
+# bimm12lo, zimm, shamt, shamtw, imm5, imm6, vd, vs3, vs1, vs2,
+# vm, wd, amoop, nf, simm5, zimm11, prs3, L, uimms, Luimm5,
+# vseglen, stagger_max, stagger_mask
+
+vfshuffle.s     rd rs1 rs2      31..30=2 29..25=0x1F 14=0 13..12=0 6..2=0x0C 1..0=3
+vfshuffle.h     rd rs1 rs2      31..30=2 29..25=0x1F 14=0 13..12=2 6..2=0x0C 1..0=3
+vfshuffle.b     rd rs1 rs2      31..30=2 29..25=0x1F 14=0 13..12=3 6..2=0x0C 1..0=3
+vfshuffle2.s    rd rs1 rs2      31..30=2 29..25=0x1F 14=1 13..12=0 6..2=0x0C 1..0=3
+vfshuffle2.h    rd rs1 rs2      31..30=2 29..25=0x1F 14=1 13..12=2 6..2=0x0C 1..0=3
+vfshuffle2.b    rd rs1 rs2      31..30=2 29..25=0x1F 14=1 13..12=3 6..2=0x0C 1..0=3