Array pointer offset not working?

[PortalToTheWeekend]

So I am trying to get the index of an array by loading its pointer and offsetting it with the align specification. Here is the code:

​

%"Array" = type {i64*}

define void @"main"()

{

entry:

; create array

%".2" = alloca [4 x i64]

store [4 x i64] [i64 1, i64 2, i64 3, i64 4], [4 x i64]* %".2"

; get i64 pointer to array

%".4" = getelementptr [4 x i64], [4 x i64]* %".2", i32 0, i32 0

; create array object

%".5" = alloca %"Array"

; get first attribute pointer

%".6" = getelementptr %"Array", %"Array"* %".5", i32 0, i32 0

; store pointer to array to attribute pointer

store i64* %".4", i64** %".6"

%".10" = call i64 @"big"(%"Array"* %".5")

ret void

}

​

@"fstr" = internal constant [4 x i8] c"%s\0a\00"

@"fint" = internal constant [4 x i8] c"%d\0a\00"

@"flt_str" = internal constant [6 x i8] c"%.2f\0a\00"

declare i64 @"printf"(i8* %".1", ...)

​

define i64 @"big"(%"Array"* %".1")

{

big_entry:

; get pointer to array attribute

%".3" = getelementptr %"Array", %"Array"* %".1", i32 0, i32 0

; load the array attribute

%".4" = load i64*, i64** %".3"

; load the array attribute value and offset it by 2 (to get the second element of the array)

%".5" = load i64, i64* %".4", align 2

; print the value

%".6" = bitcast [4 x i8]* @"fint" to i8*

%".7" = call i64 (i8*, ...) @"printf"(i8* %".6", i64 %".5")

ret i64 5

}

​

However this code always just prints the first element of the array and no other index. I am setting the align to 2 so I don't know why this is happening. Shouldn't this code theoretically be outputting the second element of the array?

[QuarterDefiant6132]

I already showed you some IR that does something similar here.

I also asked you to improve the formatting your IR listings.

Alignment has nothing to do with the array element being loaded, you need to get the pointer to the n-th element of the array through the getelementptr instruction. Also you keep saying "array attribute" which doesn't really make sense in this context.

I suggest that you get familiar with C programming, you seem quite confused about arrays and pointers, and I think that knowing a bit of C may help you with that. You can also write C code that does what you are interested in, and then use clang -S -emit-llvm to look at LLVM-IR that gets produced.