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Re: Designs for better debug info in GCC

Daniel Berlin wrote:

Here is the easy one:

z_5 = a_3 + b_3
x_4 = z_5 + c_3

DEBUG(x, x_4)


Reassoc may transform this into:


z_5 = c_3 + b_3
x_4 = z_5 + a_3

DEBUG(x, x_4)

Now x has the wrong value.
??

x_4 looks like it has the value 'a_3 + b_3 + c_3' in both examples to me, although computed in different orders...

so isn't that still the right value?

Andrew

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