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List:       llvm-dev
Subject:    [llvm-dev] Identify accessed memory regions with LLVM pass
From:       Harish via llvm-dev <llvm-dev () lists ! llvm ! org>
Date:       2021-12-28 5:58:27
Message-ID: CA+BROwBFdR450m-j1Knw9zJw5hviYZFd3o8oOHDRuNXAdECijA () mail ! gmail ! com
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 I am working on an architecture that uses scratchpad memory. So I am
planning to implement a pass that inserts data transfer
instructions(custom) before the computation. Look at the below example
where the fun() needs A, B, C arrays. Before invoking fun(), I have the
move these arrays to the scratchpad. How do I identify the memory region
accessed by these arrays? Any pointers would be helpful.

void fun(int *A, int *B, int *C, int start, int end){
    for (int i = start; i < end; ++i) {
        [i] = A[i] + B[i];
    }

}

void test(){

    int start, end;
    int *A, *B, *C;
    // Intialize variables

    // TODO:
    //   1. Identify the memory region accessed by A, B and C
    //   2. Move the accessed regions to scratchpad memory
    fun(A, B, C, start, end);
}

[Attachment #5 (text/html)]

<div dir="ltr"><div> I am working on an architecture that uses scratchpad memory. So \
I am  planning to implement a pass that inserts data transfer 
instructions(custom) before the computation. Look at the below example 
where the fun() needs A, B, C arrays. Before invoking fun(), I have the 
move these arrays to the scratchpad. How do I identify the memory region
 accessed by these arrays? Any pointers would be helpful.</div><div><pre><code>void \
fun(int *A, int *B, int *C, int start, int end){  for (int i = start; i &lt; end; \
++i) {  [i] = A[i] + B[i];
    }

}

void test(){
    
    int start, end;
    int *A, *B, *C;
    // Intialize variables

    // TODO: 
    //   1. Identify the memory region accessed by A, B and C
    //   2. Move the accessed regions to scratchpad memory
    fun(A, B, C, start, end);
}</code></pre></div></div>


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