PM0214 datasheet(153/245 Pages) STMICROELECTRONICS

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PM0214

The STM32 Cortex-M4 instruction set

244

3.10.6

VCVTB, VCVTT

Converts between a half-precision value and a single-precision value.

Syntax

VCVT{y}{cond}.F32.F16 Sd, Sm

VCVT{y}{cond}.F16.F32 Sd, Sm

where:

•

‘y’ Specifies which half of the operand register Sm or destination register Sd is used for

the operand or destination:

If y is B, then the bottom half, bits [15:0], of Sm or Sd is used.

If y is T, then the top half, bits [31:16], of Sm or Sd is used.

•

‘cond’ is an optional condition code, see Conditional execution on page 64.

•

‘Sd’ is the destination register

•

‘Sm’ is the operand register.

Operation

This instruction with the .F16.32 suffix:

Converts the half-precision value in the top or bottom half of a single-precision. register

to single-precision.

Writes the result to a single-precision register.

This instruction with the .F32.F16 suffix:

Converts the value in a single-precision register to half-precision.

Writes the result into the top or bottom half of a single-precision register, preserving the

other half of the target register.

Restrictions

There are no restrictions.

Condition flags

These instructions do not change the flags.

PM0214 Datasheet(PDF) 153 Page - STMicroelectronics