:@code_llvm

..  @code_llvm

Evaluates the arguments to the function call, determines their types, and calls :func:`code_llvm` on the resulting expression.

Examples

The @code_llvm macro in Julia is used to evaluate the arguments to a function call, determine their types, and then call the code_llvm function on the resulting expression. It provides the LLVM Intermediate Representation (IR) for the function call.

Here are some examples of how to use @code_llvm:

Inspecting the LLVM IR for a simple function call:

julia> function add_numbers(a, b)
          return a + b
       end
julia> @code_llvm add_numbers(2, 3)
; Function add_numbers
; Location: REPL[1]:2
define i64 @julia_add_numbers_17947(i64, i64) {
top:
 ; Location: REPL[1]:3
 %2 = add i64 %0, %1
 ret i64 %2
}

This example shows the LLVM IR generated for the add_numbers function call with arguments 2 and 3.

Inspecting the LLVM IR for a more complex function call:

julia> function factorial(n)
          if n == 0
              return 1
          else
              return n * factorial(n - 1)
          end
       end
julia> @code_llvm factorial(5)
; Function factorial
; Location: REPL[1]:2
define i64 @julia_factorial_17948(i64) {
top:
 ; Location: REPL[1]:3
 %1 = icmp eq i64 %0, 0
 br i1 %1, label %L7, label %L3

L3:                                               ; preds = %top
 ; Location: REPL[1]:4
 %2 = add i64 %0, -1
 %3 = call i64 @julia_factorial_17948(i64 %2)
 %4 = mul i64 %0, %3
 br label %L7

L7:                                               ; preds = %L3, %top
 ; Location: REPL[1]:6
 %5 = phi i64 [ 1, %top ], [ %4, %L3 ]
 ret i64 %5
}

This example shows the LLVM IR generated for the factorial function call with argument 5.

Common mistake example:

julia> @code_llvm add_numbers("2", 3)
ERROR: MethodError: no method matching add_numbers(::String, ::Int64)

In this example, the @code_llvm macro throws an error because the arguments provided do not match the expected types for the function add_numbers. Ensure that the arguments passed to the function are of the correct types to avoid such errors.

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:@code_llvm

Examples

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