mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
0fe3cf0096
We use the formal source type do decide whether a checked_cast_br is known to succeed/fail. If we don't update it we loose that optimization That is: ``` checked_cast_br AnyObject in %2 : X to X, bb1, bb2 ``` Will not be simplified even though the operand and the destintation type matches.
40 lines
1.3 KiB
Plaintext
40 lines
1.3 KiB
Plaintext
// RUN: %target-sil-opt -sil-print-types -enable-sil-verify-all %s -simplification -simplify-instruction=checked_cast_br -sil-print-debuginfo | %FileCheck %s
|
|
|
|
// REQUIRES: swift_in_compiler
|
|
|
|
import Swift
|
|
import Builtin
|
|
|
|
protocol P : AnyObject {}
|
|
class B : P {}
|
|
class X : B {}
|
|
|
|
// CHECK-LABEL: sil [ossa] @test_ossa :
|
|
// CHECK: %0 = alloc_ref
|
|
// CHECK-NEXT: checked_cast_br X in %0 : $X
|
|
// CHECK: bb2([[A:%.*]] : @owned $X):
|
|
// CHECK-NEXT: [[U:%.*]] = upcast [[A]] : $X to $B, loc "takethis":1:1
|
|
// CHECK-NEXT: [[E:%.*]] = init_existential_ref [[U]] {{.+}}, loc "takethis":1:1
|
|
// CHECK-NEXT: debug_value [[E]] : $AnyObject, let, name "me", loc "ignore-this-meta-inst":1:1
|
|
// CHECK-NEXT: destroy_value [[E]] : $AnyObject, loc "takethis":1:1
|
|
// CHECK: } // end sil function 'test_ossa'
|
|
sil [ossa] @test_ossa : $@convention(thin) () -> @owned X {
|
|
bb0:
|
|
%0 = alloc_ref $X
|
|
%1 = upcast %0 : $X to $B
|
|
%2 = init_existential_ref %1 : $B : $B, $AnyObject
|
|
debug_value %2 : $AnyObject, name "x"
|
|
checked_cast_br AnyObject in %2 : $AnyObject to X, bb1, bb2
|
|
|
|
bb1(%5 : @owned $X):
|
|
return %5 : $X
|
|
|
|
bb2(%7 : @owned $AnyObject):
|
|
debug_value %7 : $AnyObject, let, name "me", loc "ignore-this-meta-inst":1:1
|
|
destroy_value %7: $AnyObject, loc "takethis":1:1
|
|
unreachable
|
|
}
|
|
|
|
sil_vtable X {
|
|
}
|