llvm dev - Aug 2018 - wrong offset addition for store 64B

Hello,
I have implemented store instruction for 16xi32 64B. it works finely except
that it has wrong offset addition. the offset should be 64 but here i m
getting it 4.

Legalizing: t277: ch = store<ST64[FixedStack7(align=64)+4](align=4)> t0,
t322, t276, undef:i64

Legalizing: t276: i64 = add FrameIndex:i64<7>, Constant:i64<4>


here it should be
Legalizing: t276: i64 = add FrameIndex:i64<7>, Constant:i64<*64*>

Why is that so?

Where am I doing mistake? otherwise store 128B works fine in this code of
matrix multiplication.

Please help.
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