Unexpected results for floating point equals

Question

Question is not about why 0.1 + 0.9 is not equals 1.0. Its about different behaviour of a equals.

Can someone explain why examples below works

Answer 1

Looking further into the IL:

summ is stored in a local of type float32

IL_000d:  ldloc.0
IL_000e:  ldloc.1
IL_000f:  add
IL_0010:  stloc.2

the result of q + w used in q + w == 1.0f is not; it is used directly in a comparison

IL_0011:  ldloc.0
IL_0012:  ldloc.1
IL_0013:  add
IL_0014:  ldc.r4     1.
IL_0019:  ceq

Presumably the storage of summ in a local means it loses enough precision that it becomes equal to 1.0f.