**OBSOLETE**, superceded by [[openpower/transcendentals]] # Summary FP Opcodes This page aids and assists in the development of FP proposals, by identifying and listing in full both publicly-known proposals and the full brownfield encoding space available in the 0b010011 major opcode. A primary critical use-case for extending FP is for 3D and supercomputing. Publicly-known FP proposals: * Zfrsqrt - Reciprocal SQRT * Zftrans - see [[ztrans_proposal]]: Transcendentals (FPOW, FEXP, FLOG, FCBRT) * Ztrig\* - see [[ztrans_proposal]]: Trigonometriics (FSIN, FCOS, FTAN, arc-variants, hypotenuse-variants) * Extension of formats to cover FP16 (RISC-V ISA Manual Table 11.3 "fmt field") * HI-half FP MV - * (Add new entries here: Zextname - Description and URL) [[!toc levels=2]] # Main FP opcode 1010011 table Notes: * Proposed new encodings in **bold**. * *Use funct5 sparingly!* - 2-operand functions only. * Single-argument FP operations should go under one of the funct5 tables * Both dual and single argument FP operations that do not require "rounding mode" should go in one of the funct5 tables that already use "funct3". * The rs2 field can be best used to sub-select a considerable number of 1-op operations, with "rounding" in funct3 * The funct3 field can be best used to sub-select a considerable number of 2-op operations * 1-op operations that do not need "rounding" have the best brownfield availability: 8 bit sub-selection (rs2=5 + funct3=3). This however is rare as most FP operations need "rounding" selection. * Be careful not to use encoding space for which FP16 has already been reserved (mostly FP conversion opcodes) [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 00000 | xx | rs2 | rs1 | rm | rd | 1010011 | FADD.xx | 00001 | xx | rs2 | rs1 | rm | rd | 1010011 | FSUB.xx | 00010 | xx | rs2 | rs1 | rm | rd | 1010011 | FMUL.xx | 00011 | xx | rs2 | rs1 | rm | rd | 1010011 | FDIV.xx | 00100 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 00101 | xx | rs2 | rs1 | yyy | rd | 1010011 | tb=00101 | 00110 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 00111 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 01000 | xx | rs2 | rs1 | yyy | rd | 1010011 | tb=01000 | 01001 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 01010 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 01011 | xx | xxxxx | rs1 | yyy | rd | 1010011 | tb=01011 | 01100 | xx | rs2 | rs1 | yyy | rd | 1010011 | **FHYPOT.xx** | 01101 | xx | rs2 | rs1 | rm | rd | 1010011 | **FATAN2.xx** | 01110 | xx | rs2 | rs1 | rm | rd | 1010011 | **FATAN2PI.xx**| 01111 | xx | rs2 | rs1 | rm | rd | 1010011 | **FPOW.xx** | 10000 | xx | rs2 | rs1 | yyy | rd | 1010011 | **FROOTN.xx** | 10001 | xx | rs2 | rs1 | yyy | rd | 1010011 | **FPOWN.xx** | 10010 | xx | rs2 | rs1 | yyy | rd | 1010011 | **FPOWR.xx** | 10011 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 10100 | xx | rs2 | rs1 | yyy | rd | 1010011 | tb=10100 | 10101 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 10110 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 10111 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 11000 | xx | xxxxx | rs1 | yyy | rd | 1010011 | tb=11000 | 11001 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 11010 | xx | xxxxx | rs1 | yyy | rd | 1010011 | tb=11010 | 11100 | xx | xxxxx | rs1 | yyy | rd | 1010011 | tb=11100 | 11101 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | 11110 | xx | xxxxx | rs1 | yyy | rd | 1010011 | tb=11110 | 11111 | xx | rs2 | rs1 | yyy | rd | 1010011 | ? | """]] Code: * xx: Opcode format field "fmt" - Table 11.3 * xxxxx: 5-bit selection field (usually 1-op selection) * yyy: funct3 selection field (usually 2-op selection) * rm: "rounding mode" ## funct5 = 00000 - FADD No brownfield encodings available. ## funct5 = 00001 - FSUB No brownfield encodings available. ## funct5 = 00010 - FMUL No brownfield encodings available. ## funct5 = 00011 - FDIV No brownfield encodings available. ## funct5 = 00100 - unused Brownfield encodings available. ## funct5 = 00100 - FSGN This table uses funct3 for encoding 2-operand FP operations [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 00100 | xx | rs2 | rs1 | 000 | rd | 1010011 | FSGNJ.xx | 00100 | xx | rs2 | rs1 | 001 | rd | 1010011 | FSGNJN.xx | 00100 | xx | rs2 | rs1 | 010 | rd | 1010011 | FSGNJX.xx | 00100 | xx | rs2 | rs1 | 011 | rd | 1010011 | ?f3=011 | 00100 | xx | rs2 | rs1 | 100 | rd | 1010011 | ?f3=100 | 00100 | xx | rs2 | rs1 | 101 | rd | 1010011 | ?f3=101 | 00100 | xx | rs2 | rs1 | 110 | rd | 1010011 | ?f3=110 | 00100 | xx | rs2 | rs1 | 111 | rd | 1010011 | ?f3=111 | """]] ## funct5 = 00101 - FMIN/MAX This table uses funct3 for encoding 2-operand FP operations where the result register is a **floating-point** value. [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 00101 | xx | rs2 | rs1 | 000 | rd | 1010011 | FMIN.S | 00101 | xx | rs2 | rs1 | 001 | rd | 1010011 | FMAX.S | 00101 | xx | rs2 | rs1 | 010 | rd | 1010011 | ?f3=010 | 00101 | xx | rs2 | rs1 | 011 | rd | 1010011 | ?f3=011 | 00101 | xx | rs2 | rs1 | 100 | rd | 1010011 | ?f3=100 | 00101 | xx | rs2 | rs1 | 101 | rd | 1010011 | ?f3=101 | 00101 | xx | rs2 | rs1 | 110 | rd | 1010011 | ?f3=110 | 00101 | xx | rs2 | rs1 | 111 | rd | 1010011 | ?f3=111 | """]] ## funct5 = 00110 - unused Brownfield encodings available. ## funct5 = 00111 - unused Brownfield encodings available. ## funct5 = 01000 - FCVT This table uses rs2 for encoding 1-operand FP operations, using funct3 to specify the "rounding" mode Notes: * FP16 logically deduced from fmt field encoding (bits 25-26) [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 01000 | 00 | 00000 | rs1 | rm | rd | 1010011 | ???????? | 01000 | 00 | 00001 | rs1 | rm | rd | 1010011 | FCVT.S.D | 01000 | 00 | 00010 | rs1 | rm | rd | 1010011 | **FCVT.S.H**| 01000 | 00 | 00011 | rs1 | rm | rd | 1010011 | FCVT.S.Q | 01000 | 00 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 01000 | 01 | 00000 | rs1 | rm | rd | 1010011 | FCVT.D.S | 01000 | 01 | 00001 | rs1 | rm | rd | 1010011 | ???????? | 01000 | 01 | 00010 | rs1 | rm | rd | 1010011 | **FCVT.D.H**| 01000 | 01 | 00011 | rs1 | rm | rd | 1010011 | FCVT.D.Q | 01000 | 01 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 01000 | 10 | 00000 | rs1 | rm | rd | 1010011 | FCVT.H.S | 01000 | 10 | 00001 | rs1 | rm | rd | 1010011 | **FCVT.H.D**| 01000 | 10 | 00010 | rs1 | rm | rd | 1010011 | ???????? | 01000 | 10 | 00011 | rs1 | rm | rd | 1010011 | FCVT.H.Q | 01000 | 10 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 01000 | 11 | 00000 | rs1 | rm | rd | 1010011 | FCVT.Q.S | 01000 | 11 | 00001 | rs1 | rm | rd | 1010011 | FCVT.Q.D | 01000 | 11 | 00010 | rs1 | rm | rd | 1010011 | **FCVT.Q.H**| 01000 | 11 | 00011 | rs1 | rm | rd | 1010011 | ???????? | 01000 | 11 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | """]] ## funct5 = 01001 - unused Brownfield encodings available. ## funct5 = 01010 - unused Brownfield encodings available. ## funct5 = 01011 - 1-op Transcendentals This table uses rs2 for encoding 1-operand FP operations, using funct3 to specify the "rounding" mode [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 01011 | xx | 00000 | rs1 | rm | rd | 1010011 | FSQRT.xx | 01011 | xx | 00001 | rs1 | rm | rd | 1010011 | **FRSQRT.xx** | 01011 | xx | 00010 | rs1 | rm | rd | 1010011 | **FRECIP.xx** | 01011 | xx | 00011 | rs1 | rm | rd | 1010011 | **FCBRT.xx** | 01011 | xx | 00100 | rs1 | rm | rd | 1010011 | **FEXP2.xx** | 01011 | xx | 00101 | rs1 | rm | rd | 1010011 | **FLOG2.xx** | 01011 | xx | 00110 | rs1 | rm | rd | 1010011 | **FEXPM1.xx** | 01011 | xx | 00111 | rs1 | rm | rd | 1010011 | **FLOGP1.xx** | 01011 | xx | 01000 | rs1 | rm | rd | 1010011 | **FEXP.xx** | 01011 | xx | 01001 | rs1 | rm | rd | 1010011 | **FLOG.xx** | 01011 | xx | 01010 | rs1 | rm | rd | 1010011 | **FEXP10.xx** | 01011 | xx | 01011 | rs1 | rm | rd | 1010011 | **FLOG10.xx** | 01011 | xx | 01100 | rs1 | rm | rd | 1010011 | **FASINH.xx** | 01011 | xx | 01101 | rs1 | rm | rd | 1010011 | **FACOSH.xx** | 01011 | xx | 01110 | rs1 | rm | rd | 1010011 | **FATANH.xx** | 01011 | xx | 01111 | rs1 | rm | rd | 1010011 | ? | 01011 | xx | 10000 | rs1 | rm | rd | 1010011 | **FSIN.xx** | 01011 | xx | 10001 | rs1 | rm | rd | 1010011 | **FSINPI.xx** | 01011 | xx | 10010 | rs1 | rm | rd | 1010011 | **FASIN.xx** | 01011 | xx | 10011 | rs1 | rm | rd | 1010011 | **FASINPI.xx**| 01011 | xx | 10100 | rs1 | rm | rd | 1010011 | **FCOS.xx** | 01011 | xx | 10101 | rs1 | rm | rd | 1010011 | **FCOSPI.xx** | 01011 | xx | 10110 | rs1 | rm | rd | 1010011 | **FACOS.xx** | 01011 | xx | 10111 | rs1 | rm | rd | 1010011 | **FACOSPI.xx**| 01011 | xx | 11000 | rs1 | rm | rd | 1010011 | **FTAN.xx** | 01011 | xx | 11001 | rs1 | rm | rd | 1010011 | **FTANPI.xx** | 01011 | xx | 11010 | rs1 | rm | rd | 1010011 | **FATAN.xx** | 01011 | xx | 11011 | rs1 | rm | rd | 1010011 | **FATANPI.xx**| 01011 | xx | 11100 | rs1 | rm | rd | 1010011 | **FSINH.xx** | 01011 | xx | 11101 | rs1 | rm | rd | 1010011 | **FCOSH.xx** | 01011 | xx | 11110 | rs1 | rm | rd | 1010011 | **FTANH.xx** | 01011 | xx | 11111 | rs1 | rm | rd | 1010011 | ? | """]] ## funct5 = 01100 - **FHYPOT** Proposed for Zftrans - FHYPOT: "sqrt(rs1 * rs1 + rs2 * rs2)" ## funct5 = 01101 - **FATAN2** Proposed for Zftrans - FATAN: "atan(rs1, rs2)" ## funct5 = 01110 - **FATAN2PI** Proposed for ZftransExt - FATAN2PI: "atan2(rs1, rs2) * PI". Rationale: Gives better accuracy than if using FMUL with the constant, PI. ## funct5 = 01111 - **FPOW** Proposed for ZftransAdv - FPOW: "FP rs1 to the power of rs2" ## funct5 = 10000 - **FROOTN** Proposed for ZftransAdv - FPROOTN: "FP rs1 to the power of (1/rs2)". rs1 is FP, rs2 is **integer**. ## funct5 = 10000 - **FPOWN** Proposed for ZftransAdv - FPOW: "FP rs1 to the power of rs2" rs1 is FP, rs2 is **integer**. ## funct5 = 10001 - **FPOW** Proposed for ZftransAdv - FPOWN: "FP rs1 to the power of rs2, rs1 +ve" rs1 and rs2 are FP, rs1 must be +ve. Equivalent to "exp(rs2 * log(rs1))" ## funct5 = 10010 - unused Brownfield encodings available. ## funct5 = 10011 - unused Brownfield encodings available. ## funct5 = 10100 - FP comparisons This table uses funct3 for encoding 2-operand FP "comparison" operations where the result register is an **integer** Notes: * FNE missing? [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 10100 | xx | rs2 | rs1 | 000 | rd | 1010011 | FLE.xx | 10100 | xx | rs2 | rs1 | 001 | rd | 1010011 | FLT.xx | 10100 | xx | rs2 | rs1 | 010 | rd | 1010011 | FEQ.xx | 10100 | xx | rs2 | rs1 | 011 | rd | 1010011 | ?f3=011 | 10100 | xx | rs2 | rs1 | 100 | rd | 1010011 | ?f3=100 | 10100 | xx | rs2 | rs1 | 101 | rd | 1010011 | ?f3=101 | 10100 | xx | rs2 | rs1 | 110 | rd | 1010011 | ?f3=110 | 10100 | xx | rs2 | rs1 | 111 | rd | 1010011 | ?f3=111 | """]] ## funct5 = 10101 - unused Brownfield encodings available. ## funct5 = 10110 - unused Brownfield encodings available. ## funct5 = 10111 - unused Brownfield encodings available. ## funct5 = 11000 - FCVT This table uses rs2 for encoding 1-operand FP operations, using funct3 to specify the "rounding" mode Notes: * FP16 logically deduced from fmt field (bits 25-26) [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 11000 | 00 | 00000 | rs1 | rm | rd | 1010011 | FCVT.W.S | 11000 | 00 | 00001 | rs1 | rm | rd | 1010011 | FCVT.WU.S | 11000 | 00 | 00010 | rs1 | rm | rd | 1010011 | FCVT.L.S | 11000 | 00 | 00011 | rs1 | rm | rd | 1010011 | FCVT.LU.S | 11000 | 00 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11000 | 01 | 00000 | rs1 | rm | rd | 1010011 | FCVT.W.D | 11000 | 01 | 00001 | rs1 | rm | rd | 1010011 | FCVT.WU.D | 11000 | 01 | 00010 | rs1 | rm | rd | 1010011 | FCVT.L.D | 11000 | 01 | 00011 | rs1 | rm | rd | 1010011 | FCVT.LU.D | 11000 | 01 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11000 | 10 | 00000 | rs1 | rm | rd | 1010011 |**FCVT.W.H** | 11000 | 10 | 00001 | rs1 | rm | rd | 1010011 |**FCVT.WU.H**| 11000 | 10 | 00010 | rs1 | rm | rd | 1010011 |**FCVT.L.H** | 11000 | 10 | 00011 | rs1 | rm | rd | 1010011 |**FCVT.LU.H**| 11000 | 10 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11000 | 11 | 00000 | rs1 | rm | rd | 1010011 | FCVT.W.Q | 11000 | 11 | 00001 | rs1 | rm | rd | 1010011 | FCVT.WU.Q | 11000 | 11 | 00010 | rs1 | rm | rd | 1010011 | FCVT.L.Q | 11000 | 11 | 00011 | rs1 | rm | rd | 1010011 | FCVT.LU.Q | 11000 | 11 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | """]] ## funct5 = 11001 - unused Brownfield encodings available. ## funct5 = 11010 - FCVT This table uses rs2 for encoding 1-operand FP operations, using funct3 to specify the "rounding" mode * FP16 logically deduced from fmt field (bits 25-26) [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 11010 | 00 | 00000 | rs1 | rm | rd | 1010011 | FCVT.S.W | 11010 | 00 | 00001 | rs1 | rm | rd | 1010011 | FCVT.S.WU | 11010 | 00 | 00010 | rs1 | rm | rd | 1010011 | FCVT.S.L | 11010 | 00 | 00011 | rs1 | rm | rd | 1010011 | FCVT.S.LU | 11010 | 00 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11010 | 01 | 00000 | rs1 | rm | rd | 1010011 | FCVT.D.W | 11010 | 01 | 00001 | rs1 | rm | rd | 1010011 | FCVT.D.WU | 11010 | 01 | 00010 | rs1 | rm | rd | 1010011 | FCVT.D.L | 11010 | 01 | 00011 | rs1 | rm | rd | 1010011 | FCVT.D.LU | 11010 | 01 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11010 | 10 | 00000 | rs1 | rm | rd | 1010011 |**FCVT.H.W** | 11010 | 10 | 00001 | rs1 | rm | rd | 1010011 |**FCVT.H.WU**| 11010 | 10 | 00010 | rs1 | rm | rd | 1010011 |**FCVT.H.L** | 11010 | 10 | 00011 | rs1 | rm | rd | 1010011 |**FCVT.H.LU**| 11010 | 10 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11010 | 11 | 00000 | rs1 | rm | rd | 1010011 | FCVT.Q.W | 11010 | 11 | 00001 | rs1 | rm | rd | 1010011 | FCVT.Q.WU | 11010 | 11 | 00010 | rs1 | rm | rd | 1010011 | FCVT.Q.L | 11010 | 11 | 00011 | rs1 | rm | rd | 1010011 | FCVT.Q.LU | 11010 | 11 | xxxxx | rs1 | rm | rd | 1010011 | rs2? | """]] ## funct5 = 11100 - FMV, FCLASS This table uses *both* rs2 *and* funct3 for encoding 1-operand FP operations. Notes: * FMV.X.Q is missing (alias of FMVH.X.D if it existed) * FP16 logically deduced from fmt field (bits 25-26) * FMVH.X.HW (half-word) missing? [[!table data=""" 31..27| 26..25| 24..20 |19..15|14...12| 11..7 | 6....0 | function | funct5| SDHQ | rs2 | rs1 |funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 11100 | 00 | 00000 | rs1 | 000 | rd | 1010011 | FMV.X.W | 11100 | 00 | 00000 | rs1 | 001 | rd | 1010011 | FCLASS.S | 11100 | 00 | xxxxx | rs1 | yyy | rd | 1010011 | rs2? f3? | ------| ----- | ----- | -----| ----- | ----- | ------- | -------- | 11100 | 01 | 00000 | rs1 | 000 | rd | 1010011 | FMV.X.D **FMVH.X.W** | 11100 | 01 | 00000 | rs1 | 001 | rd | 1010011 | FCLASS.D | 11100 | 01 | xxxxx | rs1 | yyy | rd | 1010011 | rs2? f3? | ------| ----- | ----- | -----| ----- | ----- | ------- | -------- | 11100 | 10 | 00000 | rs1 | 000 | rd | 1010011 |**FMV.X.H** | 11100 | 10 | 00000 | rs1 | 001 | rd | 1010011 |**FCLASS.H** | 11100 | 10 | xxxxx | rs1 | yyy | rd | 1010011 | rs2? f3? | ------| ----- | ----- | -----| ----- | ----- | ------- | -------- | 11100 | 11 | 00000 | rs1 | 000 | rd | 1010011 | **FMVH.X.D** | 11100 | 11 | 00000 | rs1 | 001 | rd | 1010011 | FCLASS.Q | 11100 | xx | xxxxx | rs1 | yyy | rd | 1010011 | rs2? f3? | """]] ## funct5 = 11101 - unused Brownfield encodings available. ## funct5 = 11110 - FMV This table uses *both* rs2 *and* funct3 for encoding 1-operand FP operations. Notes: * FMV.Q.X is missing (as is FMVH.D.X) * FMVH.W.X is missing (alias of FMV.D.X) * FP16 logically deduced from fmt field (bits 25-26) * FMVH.HW.X (half-word) missing? [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | 11110 | 00 | 00000 | rs1 | 000 | rd | 1010011 | FMV.W.X | 11110 | 00 | xxxxx | rs1 | yyy | rd | 1010011 | rs2? f3? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11110 | 01 | 00000 | rs1 | 000 | rd | 1010011 | FMV.D.X | 11110 | 01 | xxxxx | rs1 | yyy | rd | 1010011 | rs2? f3? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11110 | 10 | 00000 | rs1 | 000 | rd | 1010011 |**FMV.H.X** | 11110 | 10 | xxxxx | rs1 | yyy | rd | 1010011 | rs2? f3? | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | 11110 | 11 | 00000 | rs1 | 000 | rd | 1010011 | ? | 11110 | 11 | xxxxx | rs1 | yyy | rd | 1010011 | rs2? f3? | """]] ## funct5 = 11111 - unused Brownfield encodings available. ## funct5 = ????? (table template) This table acts as a cut/paste template for creating brownfield encodings [[!table data=""" 31..27 | 26..25 | 24..20 |19..15| 14...12| 11..7 | 6....0 | function | funct5 | SDHQ | rs2 | rs1 | funct3 | rd | opcode | name | 5 | 2 | 5 | 5 | 3 | 5 | 7 | | ------ | ----- | ----- | -----| ----- | ----- | ------- | -------- | """]]