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AMD64 Technology 24594 Rev. 3.10 February 2005Table A-10.x87 Opcodes and ModRM Extensions (continued)OpcodeDCModRMmodField!1111ModRM reg Field/0 /1 /2 /3 /4 /5 /6 /700–BFFADD FMUL FCOM FCOMP FSUB FSUBR FDIV FDIVRmem64real mem64real mem64real mem64real mem64real mem64real mem64real mem64realC0 C8 D0 D8 E0 E8 F0 F8FADD FMUL reserved reserved FSUBR FSUB FDIVR FDIVST(0), ST(0) ST(0), ST(0) ST(0), ST(0) ST(0), ST(0) ST(0), ST(0) ST(0), ST(0)C1 C9 D1 D9 E1 E9 F1 F9FADD FMUL reserved reserved FSUBR FSUB FDIVR FDIVST(1), ST(0) ST(1), ST(0) ST(1), ST(0) ST(1), ST(0) ST(1), ST(0) ST(1), ST(0)C2 CA D2 DA E2 EA F2 FAFADD FMUL reserved reserved FSUBR FSUB FDIVR FDIVST(2), ST(0) ST(2), ST(0) ST(2), ST(0) ST(2), ST(0) ST(2), ST(0) ST(2), ST(0)C3 CB D3 DB E3 EB F3 FBFADD FMUL reserved reserved FSUBR FSUB FDIVR FDIVST(3), ST(0) ST(3), ST(0) ST(3), ST(0) ST(3), ST(0) ST(3), ST(0) ST(3), ST(0)C4 CC D4 DC E4 EC F4 FCFADD FMUL reserved reserved FSUBR FSUB FDIVR FDIVST(4), ST(0) ST(4), ST(0) ST(4), ST(0) ST(4), ST(0) ST(4), ST(0) ST(4), ST(0)C5 CD D5 DD E5 ED F5 FDFADD FMUL reserved reserved FSUBR FSUB FDIVR FDIVST(5), ST(0) ST(5), ST(0) ST(5), ST(0) ST(5), ST(0) ST(5), ST(0) ST(5), ST(0)C6 CE D6 DE E6 EE F6 FEFADD FMUL reserved reserved FSUBR FSUB FDIVR FDIVST(6), ST(0) ST(6), ST(0) ST(6), ST(0) ST(6), ST(0) ST(6), ST(0) ST(6), ST(0)C7 CF D7 DF E7 EF F7 FFFADD FMUL reserved reserved FSUBR FSUB FDIVR FDIVST(7), ST(0) ST(7), ST(0) ST(7), ST(0) ST(7), ST(0) ST(7), ST(0) ST(7), ST(0)398 Appendix A: Opcode and Operand Encodings
24594 Rev. 3.10 February 2005 AMD64 TechnologyTable A-10.x87 Opcodes and ModRM Extensions (continued)OpcodeDDModRMmodField!111100–BFFLD FISTTP FST FSTP FRSTOR invalid FNSAVE FNSTSWmem64real mem64int mem64real mem64realModRM reg Field/0 /1 /2 /3 /4 /5 /6 /7mem98/108envmem98/108envC0 C8 D0 D8 E0 E8 F0 F8mem16FFREE reserved FST FSTP FUCOM FUCOMP invalid invalidST(0) ST(0) ST(0) ST(0), ST(0) ST(0)C1 C9 D1 D9 E1 E9 F1 F9FFREE reserved FST FSTP FUCOM FUCOMP invalid invalidST(1) ST(1) ST(1) ST(1), ST(0) ST(1)C2 CA D2 DA E2 EA F2 FAFFREE reserved FST FSTP FUCOM FUCOMP invalid invalidST(2) ST(2) ST(2) ST(2), ST(0) ST(2)C3 CB D3 DB E3 EB F3 FBFFREE reserved FST FSTP FUCOM FUCOMP invalid invalidST(3) ST(3) ST(3) ST(3), ST(0) ST(3)C4 CC D4 DC E4 EC F4 FCFFREE reserved FST FSTP FUCOM FUCOMP invalid invalidST(4) ST(4) ST(4) ST(4), ST(0) ST(4)C5 CD D5 DD E5 ED F5 FDFFREE reserved FST FSTP FUCOM FUCOMP invalid invalidST(5) ST(5) ST(5) ST(5), ST(0) ST(5)C6 CE D6 DE E6 EE F6 FEFFREE reserved FST FSTP FUCOM FUCOMP invalid invalidST(6) ST(6) ST(6) ST(6), ST(0) ST(6)C7 CF D7 DF E7 EF F7 FFFFREE reserved FST FSTP FUCOM FUCOMP invalid invalidST(7) ST(7) ST(7) ST(7), ST(0) ST(7)Appendix A: Opcode and Operand Encodings 399
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