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// RUN: mlir-opt -allow-unregistered-dialect %s -inline -split-input-file | FileCheck %s
// This file tests the callgraph dead code elimination performed by the inliner.
// Function is already dead.
// CHECK-NOT: func @dead_function
func @dead_function() attributes {sym_visibility = "private"} {
return
}
// Function becomes dead after inlining.
// CHECK-NOT: func @dead_function_b
func @dead_function_b() attributes {sym_visibility = "private"} {
return
}
// CHECK: func @live_function()
func @live_function() {
call @dead_function_b() : () -> ()
return
}
// Same as above, but a transitive example.
// CHECK: func @live_function_b
func @live_function_b() {
return
}
// CHECK-NOT: func @dead_function_c
func @dead_function_c() attributes {sym_visibility = "private"} {
call @live_function_b() : () -> ()
return
}
// CHECK-NOT: func @dead_function_d
func @dead_function_d() attributes {sym_visibility = "private"} {
call @dead_function_c() : () -> ()
call @dead_function_c() : () -> ()
return
}
// CHECK: func @live_function_c
func @live_function_c() {
call @dead_function_c() : () -> ()
call @dead_function_d() : () -> ()
return
}
// Function is referenced by non-callable top-level user.
// CHECK: func @live_function_d
func @live_function_d() attributes {sym_visibility = "private"} {
return
}
"live.user"() {use = @live_function_d} : () -> ()
// -----
// This test checks that the inliner can properly handle the deletion of
// functions in different SCCs that are referenced by calls materialized during
// canonicalization.
// CHECK: func @live_function_e
func @live_function_e() {
call @dead_function_e() : () -> ()
return
}
// CHECK-NOT: func @dead_function_e
func @dead_function_e() -> () attributes {sym_visibility = "private"} {
"test.fold_to_call_op"() {callee=@dead_function_f} : () -> ()
return
}
// CHECK-NOT: func @dead_function_f
func @dead_function_f() attributes {sym_visibility = "private"} {
return
}
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