6.6.2
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.
•
FSCHG
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
RENESAS [ RENESAS TECHNOLOGY CORP ]
