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CCS/TMS320F28032: we shield one line of code, big noise happened, why?

Part Number: TMS320F28032


Tool/software: Code Composer Studio

hi, 

My customer design a Charging plie wit 28032, the software is CCS3.3 and the complier is 5.2.4.

if we shield one line of code in firmware, there is a big noise on the output voltage waveform.

we compare the assembly code, we found some differences, but we don't know why these differences can make a big noise.

have you seen it before? how to explain it?

sorry i can't pose customer's code on a public forum.

Thank you

Erwin