RM0004 Datasheet, PDF (645/1176 Pages) STMicroelectronics – Programmer’s reference manual for Book E processors

Instruction set
RM0004
evstdd
SPE, Vector SPFP, Scalar DPFP APUs User
Vector store double of double
evstdd
rS,d(rA)
evstdd
0
56
000100
10 11
15 16
20 21
31
rS
rA
UIMM⁽¹⁾
01100100001
1. d = UIMM * 8
if (rA = 0) then b ← 0
else b ← (rA)
EA ← b + EXTZ(UIMM*8)
MEM(EA,8) ← RS_0:63
The contents of rS are stored as a double word in storage addressed by EA.
Figure 157 shows how bytes are stored in memory as determined by the endian mode.
Figure 157. evstdd results in big- and little-endian modes
GPR a b c d e f g h
Byte address 0 1 2 3 4 5 6 7
Memory in big endian a b c d e f g h
Memory in little endian h g f e d c b a
Implementation note: If the EA is not double-word aligned, an alignment exception occurs.
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