fmov
Floating-Point Move (Immediate)
FMOV <Hd|Sd|Dd>, #<fimm>
Moves a floating-point immediate into a scalar register.
Details
Moves a floating-point immediate constant into a half-precision (H), single-precision (S), or double-precision (D) scalar FP register. The immediate is encoded as an 8-bit value and expanded to full precision according to the IEEE 754 floating-point format. NZCV flags are not affected. This is an AArch64-only instruction that executes at any privilege level.
Pseudocode Operation
Vd ← decode_fp_immediate(imm8, type)Example
FMOV Dd, #1.0
Encoding
Binary Layout
0
0
0
11110
00
1
imm8
100
00000
Rd
Operands
-
Vd
Destination SIMD/FP vector register -
fimm
Floating-point immediate value
Reference (Arm A64 ISA)
Instruction Forms
| Encoding | Instruction | ISA | Bit pattern | ||
|---|---|---|---|---|---|
| 0x0F00FC00 | FMOV <Vd>.<T>, #<imm> | A64 | 0 | Q | 0 | 0111100000 | a | b | c | 1111 | 1 | 1 | d | e | f | g | h | Rd | ||
| 0x0F00F400 | FMOV <Vd>.<T>, #<imm> | A64 | 0 | Q | 0 | 0111100000 | a | b | c | 1111 | 0 | 1 | d | e | f | g | h | Rd | ||
| 0x6F00F400 | FMOV <Vd>.2D, #<imm> | A64 | 0 | 1 | 1 | 0111100000 | a | b | c | 1111 | 0 | 1 | d | e | f | g | h | Rd | ||
| 0x05104000 | FMOV <Zd>.<T>, <Pg>/M, #0.0 | A64 | 00000101 | size | 01 | Pg | 0 | 1 | 0 | 00000000 | Zd | ||
| 0x2538C000 | FMOV <Zd>.<T>, #0.0 | A64 | 00100101 | size | 111 | 0 | 0 | 011 | 0 | 00000000 | Zd | ||
| 0x0510C000 | FMOV <Zd>.<T>, <Pg>/M, #<const> | A64 | 00000101 | size | 01 | Pg | 110 | imm8 | Zd | ||
| 0x2539C000 | FMOV <Zd>.<T>, #<const> | A64 | 00100101 | size | 111 | 0 | 0 | 111 | 0 | imm8 | Zd | ||
| 0x1EE04000 | FMOV <Hd>, <Hn> | A64 | 0 | 0 | 0 | 11110 | 11 | 10000 | 00 | 10000 | Rn | Rd | ||
| 0x1E204000 | FMOV <Sd>, <Sn> | A64 | 0 | 0 | 0 | 11110 | 00 | 10000 | 00 | 10000 | Rn | Rd | ||
| 0x1E604000 | FMOV <Dd>, <Dn> | A64 | 0 | 0 | 0 | 11110 | 01 | 10000 | 00 | 10000 | Rn | Rd | ||
| 0x1EE60000 | FMOV <Wd>, <Hn> | A64 | 0 | 0 | 0 | 11110 | 11 | 1 | 00 | 110 | 000000 | Rn | Rd | ||
| 0x9EE60000 | FMOV <Xd>, <Hn> | A64 | 1 | 0 | 0 | 11110 | 11 | 1 | 00 | 110 | 000000 | Rn | Rd | ||
| 0x1EE70000 | FMOV <Hd>, <Wn> | A64 | 0 | 0 | 0 | 11110 | 11 | 1 | 00 | 111 | 000000 | Rn | Rd | ||
| 0x1E270000 | FMOV <Sd>, <Wn> | A64 | 0 | 0 | 0 | 11110 | 00 | 1 | 00 | 111 | 000000 | Rn | Rd |
Description
Floating-point move immediate (scalar). This instruction copies a floating-point immediate constant into 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.
Operation
CheckFPEnabled64(); V[d, datasize] = imm;