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Different code generated after switching from 6.2.7 to 6.4.3 compiler

Pierre Bouchet1
Expert 2595 points


Hi everyone,

I’ve noticed a variation in the code generated by the C2000 compiler after switching from 6.2.7 to 6.4.3. In one function I copy the content of a union like so:

volatile union CANMC_REG shadow;
shadow = ECanaRegs.CANMC;

With 6.2.7 the compiler generates a MOVL to copy the union, exactly as though I had written the following:

shadow.all = EcanaRegs.CANMC.all

With 6.4.3 however, the compiler generates a PREAD || RPT #1.

Hence my question: is this the intended behaviour?

Please note I’m not asking how to get the compiler to generate a MOVL, this much is obvious. I’m merely asking if there is a rationale behind the change of behaviour between 6.2.7 and 6.4.3 and what to expect in the next versions of the C2000 compiler.

Best regards,

Pierre