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What is the general purpose register number for LR in Cortex M3

Umut Umut
Note: This was originally posted on 25th March 2009 at http://forums.arm.com

Note: Topic title is not valid. It should be "What is the general purpose register number for FP in Cortex M3"

I would like to know which general purpose register is used for FP when I assemble following code. Anybody?

cmp           r4, r5
itttt             ne
cmpne       r5, r6
ldrne          fp, [r4], #4           @ FP is used here but I am not sure which register is FP
strne          fp, [r4], #4           @ FP is used here but I am not sure which register is FP
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