machine dependent left shift results

  • Thread starter easily_confused
  • Start date
E

easily_confused

On a 32 bit machine, ~0<<32 gives 11111111111111111111111111111111 (I was
expecting 0)

(~0<<31)<<1 gives 0.

I was trying ~(~0<<$size) to create a mask of $size ones.

((1<<$size) -1) was what I tried first but it also failed for the same
reason, I guess.

I like that in verilog I can just say {$size{1'b1}}

I know I can use Math::BigInt, but I still wonder what the rationale is
behind the first example failing.

EC
 

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