Page 315 - ARM 64 Bit Assembly Language

304 Chapter 9

9.5.2.2 Operations

Name Effect Description
fmov Fd ← fpimm Move Immediate Data to Fd

9.5.2.3 Examples

1 fmov d3,#5.0 // d3 <- 5.0
2 fmov s5,#-7.0 // s5 <- -7.0

9.6 Data conversion instructions

The ARM FP provides several instructions for converting between various floating point and
integer formats. Some FP versions also have instructions for converting between fixed point
and floating point formats.

9.6.1 Convert between double, single, and half precision

These instructions are used for converting between IEEE double precision, single precision,
and half precision floating point:
fcvt Convert Between Double, Single, and Half Precision.

9.6.1.1 Syntax

fcvt Sd, Hn
fcvt Dd, Hn
fcvt Hd, Sn
fcvt Dd, Sn
fcvt Hd, Dn
fcvt Sd, Dn

• Although the data processing instructions do not operate on half precision numbers, they
may be used to store data in half the space required for single precision, or one quarter the
space required for double precision.

9.6.1.2 Operations

Name Effect Description
fcvt Sd ← single(Hn) Convert half precision number in Hn
to single precision and store in Sd.
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