Floating-point Absolute value (scalar). This instruction calculates the absolute value in the SIMD&FP source register and writes the result to the SIMD&FP destination register.
Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | ftype | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | Rn | Rd | |||||||||
| opc | |||||||||||||||||||||||||||||||
integer d = UInt(Rd); integer n = UInt(Rn); integer esize; case ftype of when '00' esize = 32; when '01' esize = 64; when '10' UNDEFINED; when '11' if HaveFP16Ext() then esize = 16; else UNDEFINED; FPUnaryOp fpop; case opc of when '00' fpop = FPUnaryOp_MOV; when '01' fpop = FPUnaryOp_ABS; when '10' fpop = FPUnaryOp_NEG; when '11' fpop = FPUnaryOp_SQRT;
| <Dd> |
Is the 64-bit name of the SIMD&FP destination register, encoded in the "Rd" field. |
| <Dn> |
Is the 64-bit name of the SIMD&FP source register, encoded in the "Rn" field. |
| <Hd> |
Is the 16-bit name of the SIMD&FP destination register, encoded in the "Rd" field. |
| <Hn> |
Is the 16-bit name of the SIMD&FP source register, encoded in the "Rn" field. |
| <Sd> |
Is the 32-bit name of the SIMD&FP destination register, encoded in the "Rd" field. |
| <Sn> |
Is the 32-bit name of the SIMD&FP source register, encoded in the "Rn" field. |
CheckFPEnabled64(); FPCRType fpcr = FPCR[]; boolean merge = fpop != FPUnaryOp_MOV && IsMerging(fpcr); bits(128) result = if merge then V[d] else Zeros(); bits(esize) operand = V[n]; case fpop of when FPUnaryOp_MOV Elem[result, 0, esize] = operand; when FPUnaryOp_ABS Elem[result, 0, esize] = FPAbs(operand); when FPUnaryOp_NEG Elem[result, 0, esize] = FPNeg(operand); when FPUnaryOp_SQRT Elem[result, 0, esize] = FPSqrt(operand, fpcr); V[d] = result;
Internal version only: isa v33.11seprel, AdvSIMD v29.05, pseudocode v2021-09_rel, sve v2021-09_rc3d ; Build timestamp: 2021-10-06T11:41
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