Cycle Timings and Interlock Behavior
ARM DDI 0363G Copyright © 2006-2011 ARM Limited. All rights reserved. C-35
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C.23.2 Permitted combinations
Table C-28 lists the permitted instruction combinations. Any instruction can be conditional or
flag-setting unless otherwise stated. Only the exact instruction combinations listed in
Table C-28 can be dual issued, provided you ensure the instruction combinations obey the rules
specified in Dual issue rules on page C-34.
Table C-28 Permitted instruction combinations
Dual issue
case
First instruction Second instruction
Case A Any instruction other than load/store multiple/double,
flag-setting multiply, non-VFP coprocessor operations,
miscellaneous processor control instructions
a
, or floating
point instructions if floating point logic is not included in
the processor
B #immed
IT
NOP
Case A-F
b
Any floating point instructions, excluding load/store
multiple, double precision
CDP
instructions,
VCVT.F64.F32
,
and
VMRS
and
VMSR
.
Case B1
LDR <Rt>, [<Rn>, #<imm>]
c
LDR <Rt>, [<Rn>, <Rm>]
c
LDR <Rt>, [<Rn>, <Rm>, LSL #1, 2 or 3]
c
Any data processing instruction that does not
require a shift by a register value.
d
Any bitfield, saturate or bit-packing
instruction.
e
Any signed or unsigned extend instruction.
f
Any
SIMD
add or subtract instruction.
g
Other miscellaneous instructions.
h
Case B1-F
b
Any single-precision CDP
i
, excluding
"VMOV.F32 <Sd>, #<imm>"
,
VNEG.F32
,
VABS.F32
,
VCVT.F64.F32
,
VDIV.F32
, and
VSQRT.F32
.
32-bit transfers to and from the floating-point
register file
l
.
Case B2
STR <Rt>, [<Rn>, #<imm>]
c
As for Case B1.
Case B2-F
b
As for Case B1-F
Case C
MOV <Rd>, #immed
jk
MOVW <Rd>, #immed
j
MOV <Rd>, <Rm>
j
Any data processing instruction.
d
Any bitfield, saturate or bit-packing
instruction.
e
Any signed or unsigned extend instruction.
f
Any
SIMD
add or subtract instruction.
g
Other miscellaneous instructions.
h
Case C-F
b
32-bit transfers to and from the floating-point
register file
l
.
Case F1
b
,
m
Any single-precision
CDP
i
, excluding
"VMOV.S32 <Sd>,
#<imm>"
,
VCVT.F64.F32
,
VABS.F32
, and
VNEG.F32
.
As for case C or C-F.
Case F2_ld
b
VLDR.F32
n
As for Case B1 or Case B1-F
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