Freescale Semiconductor StarCore SC140 - Manual (Page 278)

7-28 SC140 DSP Core Reference Manual
Static Programming Rules
Rule SR.7
The following instructions that affect status bits in SR cannot be grouped in a VLES with a MOVE-like
instruction that reads the SR register:
• BREAK
• CONT/CONTD
• DI and EI
• DOENn and DOENSHn
• SKIPLS
For mutually exclusive IFc subgroups in a VLES, this rule applies independently to each subgroup.
Example 7-47. Status Bit Update with SR Read
doen0 #5 move.l sr,d0 ;not allowed
di push sr ;not allowed
skipls _dest bmtsts #4,sr.h ;not allowed
7.5.7 Loop Nesting Rules
Rule L.N.1
Nested loops cannot have the same LA.
Example 7-48. Nested Loops with the Same LA
...
move.w r3,(r4)
;LA
loopend1
loopend0
;not allowed