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STRD ATOMIC?

Hi, I make a software for Cortex-A9 and Cortex-M4 (both uni-processor system).

Question.

Is 64bit-aligned STRD(64bit memory access) atomic ?

(I know tha It is not atomic, but i don't know behavior.)

For example:

LDR R2,=buff

mov R0, #1

mov R1, #2

STRD R0, R1, [R2]

mov R0, #3

mov R1, #4

STRD R0, R1, [R2]   <-  interrupt occerd

handler:

LDR R2,=buff

LDR R0, R1, [R2]  <--- ???

Is[R0,R1] == [#3, #2] may?

If it is, require disable-interrupt between STRD?