Pair Single-Precision Data Transfer - Hitachi SH7750 Hardware Manual

Sh7750 series superh risc engine

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Pair Single-Precision Data Transfer

In addition to the powerful new geometric operation instructions, the SH7750 Series also supports

high-speed data transfer instructions.

When FPSCR.SZ = 1, the SH7750 Series can perform data transfer by means of pair single-

precision data transfer instructions.

• FMOV DRm/XDm, DRn/XDRn (m, n: 0, 2, 4, 6, 8, 10, 12, 14)

• FMOV DRm/XDm, @Rn (m: 0, 2, 4, 6, 8, 10, 12, 14; n: 0 to 15)

These instructions enable two single-precision (2 × 32-bit) data items to be transferred; that is, the

transfer performance of these instructions is doubled.

This instruction changes the value of the SZ bit in FPSCR, enabling fast switching between

use and non-use of pair single-precision data transfer.

Programming Note:

When FPSCR.SZ = 1 and big-endian mode is used, FMOV can be used for a double-precision

floating-point load or store. In little-endian mode, a double-precision floating-point load or store

requires execution of two 32-bit data size operations with FPSCR.SZ = 0.

Rev. 6.0, 07/02, page 172 of 986

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