[LLVMdev] compare two GEP instructions operand by operand

Jimborean Alexandra
Tue, 30 Aug 2011 15:10:28 -0000

Hi,

I have a question regarding the GEP instruction. Is
it correct to consider that two GEP instructions compute the same memory address
if and only if all their corresponding fields are equal?


For instance, for a two-dimensional array of integers, can we have two GEP
instructions that are equal?


  %arrayidx = getelementptr [10 x [30 x i32]]* @main.B, i64 0, i64 0, i64
%tmp157

  %tmp = load i32* getelementptr inbounds ([10 x [30 x i32]]* @main.B, i64 0,
i64 3, i64 10), align 8

although their corresponding indices are different? For instance if %tmp157 goes
out of the bounds of the line 0 and computes the address of the 10th
element in line 3.


Thank you,Alexandra
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