cairo-lang-lowering 2.19.0

Cairo lowering phase.
Documentation 
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//! > Test simple linear function with parameters and statement outputs

//! > test_runner_name
test_analysis(analysis: use_sites)

//! > function_code
fn foo(x: felt252, y: felt252) -> felt252 {
    x + y
}

//! > function_name
foo

//! > module_code

//! > semantic_diagnostics

//! > lowering
Parameters: v0: core::felt252, v1: core::felt252
blk0 (root):
Statements:
  (v2: core::felt252) <- core::felt252_add(v0, v1)
End:
  Return(v2)

//! > result
[
    v0: [(stmt(blk0, 0), 1)],
    v1: [(stmt(blk0, 0), 1)],
    v2: [(end(blk0), 1)],
]

//! > ==========================================================================

//! > Test variable used multiple times

//! > test_runner_name
test_analysis(analysis: use_sites)

//! > function_code
fn foo(x: felt252) -> felt252 {
    x + x + x
}

//! > function_name
foo

//! > module_code

//! > semantic_diagnostics

//! > lowering
Parameters: v0: core::felt252
blk0 (root):
Statements:
  (v1: core::felt252) <- core::felt252_add(v0, v0)
  (v2: core::felt252) <- core::felt252_add(v1, v0)
End:
  Return(v2)

//! > result
[
    v0: [(stmt(blk0, 0), 2), (stmt(blk0, 1), 1)],
    v1: [(stmt(blk0, 1), 1)],
    v2: [(end(blk0), 1)],
]

//! > ==========================================================================

//! > Test branching with goto remappings

//! > test_runner_name
test_analysis(analysis: use_sites)

//! > function_code
fn foo(x: bool) -> felt252 {
    let y = if x {
        1
    } else {
        2
    };
    y + 3
}

//! > function_name
foo

//! > module_code

//! > semantic_diagnostics

//! > lowering
Parameters: v0: core::bool
blk0 (root):
Statements:
End:
  Match(match_enum(v0) {
    bool::False(v1) => blk1,
    bool::True(v2) => blk2,
  })

blk1:
Statements:
  (v3: core::felt252) <- 2
End:
  Goto(blk3, {v3 -> v4})

blk2:
Statements:
  (v5: core::felt252) <- 1
End:
  Goto(blk3, {v5 -> v4})

blk3:
Statements:
  (v6: core::felt252) <- 3
  (v7: core::felt252) <- core::felt252_add(v4, v6)
End:
  Return(v7)

//! > result
[
    v0: [(end(blk0), 1)],
    v1: [],
    v2: [],
    v3: [(end(blk1), 1)],
    v4: [(stmt(blk3, 1), 1)],
    v5: [(end(blk2), 1)],
    v6: [(stmt(blk3, 1), 1)],
    v7: [(end(blk3), 1)],
]

//! > ==========================================================================

//! > Test variable used as call argument and call result reused

//! > test_runner_name
test_analysis(analysis: use_sites)

//! > function_code
fn foo(x: felt252) -> felt252 {
    let y = bar(x);
    y + y
}

//! > function_name
foo

//! > module_code
#[inline(never)]
fn bar(x: felt252) -> felt252 {
    x
}

//! > semantic_diagnostics

//! > lowering
Parameters: v0: core::felt252
blk0 (root):
Statements:
  (v1: core::felt252) <- test::bar(v0)
  (v2: core::felt252) <- core::felt252_add(v1, v1)
End:
  Return(v2)

//! > result
[
    v0: [(stmt(blk0, 0), 1)],
    v1: [(stmt(blk0, 1), 2)],
    v2: [(end(blk0), 1)],
]