RISC-V ISA Explorer · Single-Letter Extensions

Q: Quad-Precision Float (128-bit)

Ratified 2019-04 · version 2.2.0

Quad-precision IEEE 754 arithmetic on 128-bit floating-point registers, for math needing more range than double.

Typical use: High-precision scientific math

Specification

Open Q in the explorer

Dependencies

Requires

Instructions (34)

Mnemonic	Name	Encoding	Match	Mask
`FADD.Q`	Floating-point Add Quad-Precision	`0000011------------------1010011`	`0x6000053`	`0xfe00007f`
`FCLASS.Q`	Floating-Point Classify Quad-Precision	`111001100000-----001-----1010011`	`0xe6001053`	`0xfff0707f`
`FCVT.D.Q`	Floating-Point Convert Quad-Precision to Double-Precision	`010000100011-------------1010011`	`0x42300053`	`0xfff0007f`
`FCVT.L.Q`	Floating-Point Convert Quad-Precision to Long	`110001100010-------------1010011`	`0xc6200053`	`0xfff0007f`
`FCVT.LU.Q`	Floating-Point Convert Quad-Precision to Unsigned Long	`110001100011-------------1010011`	`0xc6300053`	`0xfff0007f`
`FCVT.Q.D`	Floating-Point Convert Double-Precision to Quad-Precision	`010001100001-------------1010011`	`0x46100053`	`0xfff0007f`
`FCVT.Q.L`	Floating-Point Convert Long to Quad-Precision	`110101100010-------------1010011`	`0xd6200053`	`0xfff0007f`
`FCVT.Q.LU`	Floating-Point Convert Unsigned Long to Quad-Precision	`110101100011-------------1010011`	`0xd6300053`	`0xfff0007f`
`FCVT.Q.S`	Floating-Point Convert Single-Precision to Quad-Precision	`010001100000-------------1010011`	`0x46000053`	`0xfff0007f`
`FCVT.Q.W`	Floating-Point Convert Word to Quad-Precision	`110101100000-------------1010011`	`0xd6000053`	`0xfff0007f`
`FCVT.Q.WU`	Floating-Point Convert Unsigned Word to Quad-Precision	`110101100001-------------1010011`	`0xd6100053`	`0xfff0007f`
`FCVT.S.Q`	Floating-Point Convert Quad-Precision to Single-Precision	`010000000011-------------1010011`	`0x40300053`	`0xfff0007f`
`FCVT.W.Q`	Floating-point Convert Quad-precision to Word	`110001100000-------------1010011`	`0xc6000053`	`0xfff0007f`
`FCVT.WU.Q`	Floating-Point Convert Unsigned Quad-Precision to Word	`110001100001-------------1010011`	`0xc6100053`	`0xfff0007f`
`FDIV.Q`	Floating-Point Divide Quad-Precision	`0001111------------------1010011`	`0x1e000053`	`0xfe00007f`
`FEQ.Q`	Floating-Point Equal Quad-Precision	`1010011----------010-----1010011`	`0xa6002053`	`0xfe00707f`
`FLE.Q`	Floating-Point Less Than or Equal Quad-Precision	`1010011----------000-----1010011`	`0xa6000053`	`0xfe00707f`
`FLQ`	Floating-Point Load Quad-Precision	`-----------------100-----0000111`	`0x4007`	`0x707f`
`FLT.Q`	Floating-Point Less Than Quad-Precision	`1010011----------001-----1010011`	`0xa6001053`	`0xfe00707f`
`FMADD.Q`	Floating-Point Multiply-Add Quad-Precision	`-----11------------------1000011`	`0x6000043`	`0x600007f`
`FMAX.Q`	Floating-Point Maximum-Number Quad-Precision	`0010111----------001-----1010011`	`0x2e001053`	`0xfe00707f`
`FMIN.Q`	Floating-Point Minimum-Number Quad-Precision	`0010111----------000-----1010011`	`0x2e000053`	`0xfe00707f`
`FMSUB.Q`	Floating-Point Multiply-Subtract Quad-Precision	`-----11------------------1000111`	`0x6000047`	`0x600007f`
`FMUL.Q`	Floating-point Multiply Quad-Precision	`0001011------------------1010011`	`0x16000053`	`0xfe00007f`
`FMV.Q.X`		`111100110000-----000-----1010011`	`0xf3000053`	`0xfff0707f`
`FMV.X.Q`		`111000110000-----000-----1010011`	`0xe3000053`	`0xfff0707f`
`FNMADD.Q`	Floating-Point Negate-Multiply-Add Quad-Precision	`-----11------------------1001111`	`0x600004f`	`0x600007f`
`FNMSUB.Q`	Floating-Point Negate-Multiply-Subtract Quad-Precision	`-----11------------------1001011`	`0x600004b`	`0x600007f`
`FSGNJ.Q`	Floating-Point Sign-Inject Quad-Precision	`0010011----------000-----1010011`	`0x26000053`	`0xfe00707f`
`FSGNJN.Q`	Floating-Point Sign-Inject Negate Quad-Precision	`0010011----------001-----1010011`	`0x26001053`	`0xfe00707f`
`FSGNJX.Q`	Floating-Point Sign-Inject XOR Quad-Precision	`0010011----------010-----1010011`	`0x26002053`	`0xfe00707f`
`FSQ`	Floating-Point Store Quad-Precision	`-----------------100-----0100111`	`0x4027`	`0x707f`
`FSQRT.Q`	Floating-Point Square Root Quad-Precision	`010111100000-------------1010011`	`0x5e000053`	`0xfff0007f`
`FSUB.Q`	Floating-Point Subtract Quad-Precision	`0000111------------------1010011`	`0xe000053`	`0xfe00007f`