FMAXNMP (scalar)
Floating-point Maximum Number of Pair of elements (scalar). This instruction compares two vector elements in the source SIMD&FP register and writes the largest of the floating-point values as a scalar to the destination SIMD&FP register.
This instruction can generate a floating-point exception. Depending on the settings in FPCR, the exception results in either a flag being set in FPSR or a synchronous exception being generated. For more information, see Floating-point exception traps.
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.
It has encodings from 2 classes:
Half-precision
and
Single-precision and double-precision
Half-precision
(ARMv8.2)
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 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | Rn | Rd |
| | | o1 | sz | | | | | |
if !HaveFP16Ext() then UnallocatedEncoding();
integer d = UInt(Rd);
integer n = UInt(Rn);
integer esize = 16;
if sz == '1' then ReservedValue();
integer datasize = esize * 2;
integer elements = 2;
ReduceOp op = if o1 == '1' then ReduceOp_FMINNUM else ReduceOp_FMAXNUM;
Single-precision and double-precision
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 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | sz | 1 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 0 | Rn | Rd |
| | | o1 | | | | | | |
integer d = UInt(Rd);
integer n = UInt(Rn);
integer esize = 32 << UInt(sz);
integer datasize = esize * 2;
integer elements = 2;
ReduceOp op = if o1 == '1' then ReduceOp_FMINNUM else ReduceOp_FMAXNUM;
Assembler Symbols
<d> | Is the number of the SIMD&FP destination register, encoded in the "Rd" field. |
<Vn> | Is the name of the SIMD&FP source register, encoded in the "Rn" field. |
Internal version only: isa v29.05v27.02, AdvSIMD v26.0, pseudocode v35.3v34.2.2
; Build timestamp: 2018-06-16T092018-03-28T19:4555
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