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55c8c433c0
It sets the `[bare]` attribute for `alloc_ref` and `global_value` instructions if their header (reference count and metatype) is not used throughout the lifetime of the object.
67 lines
1.6 KiB
Plaintext
67 lines
1.6 KiB
Plaintext
// RUN: %target-sil-opt %s -strip-object-headers | %FileCheck %s
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// REQUIRES: swift_in_compiler
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sil_stage canonical
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import Builtin
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import Swift
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import SwiftShims
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class B {
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}
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class C : B {
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@_hasStorage var a: Int
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}
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sil_global @g : $C
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sil @unknown_func : $@convention(thin) (@guaranteed C) -> ()
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// CHECK-LABEL: sil @test_alloc_ref :
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// CHECK: alloc_ref [bare] [stack] $C
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// CHECK: } // end sil function 'test_alloc_ref'
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sil @test_alloc_ref : $@convention(thin) () -> () {
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bb0:
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%0 = alloc_ref [stack] $C
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debug_value %0 : $C, let, name "x"
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%1 = upcast %0 : $C to $B
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%2 = end_cow_mutation %1 : $B
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%3 = unchecked_ref_cast %2 : $B to $C
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%4 = ref_element_addr %3 : $C, #C.a
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%5 = ref_tail_addr %3 : $C, $Int
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set_deallocating %0 : $C
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fix_lifetime %0 : $C
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dealloc_ref %0 : $C
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dealloc_stack_ref %0 : $C
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%6 = tuple ()
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return %6 : $()
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}
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// CHECK-LABEL: sil @test_global_value :
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// CHECK: global_value [bare] @g
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// CHECK: } // end sil function 'test_global_value'
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sil @test_global_value : $@convention(thin) () -> () {
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bb0:
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%0 = global_value @g : $C
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debug_value %0 : $C, let, name "x"
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%4 = ref_element_addr %0 : $C, #C.a
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%5 = ref_tail_addr %0 : $C, $Int
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%6 = tuple ()
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return %6 : $()
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}
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// CHECK-LABEL: sil @test_not_bare :
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// CHECK: alloc_ref [stack] $C
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// CHECK: } // end sil function 'test_not_bare'
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sil @test_not_bare : $@convention(thin) () -> () {
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bb0:
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%0 = alloc_ref [stack] $C
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%1 = function_ref @unknown_func : $@convention(thin) (@guaranteed C) -> ()
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%2 = apply %1(%0) : $@convention(thin) (@guaranteed C) -> ()
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dealloc_stack_ref %0 : $C
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%6 = tuple ()
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return %6 : $()
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}
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