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8cf4e34cc1
For example:
```
%0 = load %1
copy_addr %1 to %2
```
->
```
%0 = load %1
store %0 to %2
```
This is important for MandatoryRedundantLoadElimination to be able to create statically initialized globals in the mandatory pipeline.
For example:
```
public struct MyStruct {
public static let r: Range<Int> = 1 ..< 3
}
```
gets a statically initialized global, even at Onone, with this improvement.
rdar://149356742
77 lines
3.5 KiB
Swift
77 lines
3.5 KiB
Swift
// RUN: %target-swift-frontend -emit-silgen -enable-experimental-feature ReferenceBindings -o - %s | %FileCheck %s
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// RUN: %target-swift-frontend -emit-sil -sil-verify-all -enable-experimental-feature ReferenceBindings -o - %s | %FileCheck -check-prefix=SIL %s
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// REQUIRES: swift_feature_ReferenceBindings
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class Klass {}
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struct S {
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var k = Klass()
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}
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func doSomething() {}
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// Before the transformation, our access scope is not to end of scope... so
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// doSomething() is not within the access scope.
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//
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// CHECK-LABEL: sil hidden [ossa] @$s18reference_bindings13testBindToVaryyF : $@convention(thin) () -> () {
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// CHECK: [[BOX:%.*]] = alloc_box ${ var Int }, var, name "x"
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// CHECK: [[LIFETIME:%.*]] = begin_borrow [var_decl] %0
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// CHECK: [[PROJECT:%.*]] = project_box [[LIFETIME]]
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// CHECK: [[INOUT_BOX:%.*]] = alloc_box ${ var Int }, var, name "x2"
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// CHECK: [[UNRESOLVED_BINDING:%.*]] = mark_unresolved_reference_binding [inout] [[INOUT_BOX]]
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// CHECK: [[INOUT_LIFETIME:%.*]] = begin_borrow [var_decl] [[UNRESOLVED_BINDING]]
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// CHECK: [[INOUT_PROJECT:%.*]] = project_box [[INOUT_LIFETIME]]
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// CHECK: [[ACCESS:%.*]] = begin_access [read] [unknown] [[PROJECT]]
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// CHECK: copy_addr [[ACCESS]] to [init] [[INOUT_PROJECT]]
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// CHECK: end_access [[ACCESS]]
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// CHECK: [[FUNC:%.*]] = function_ref @$s18reference_bindings11doSomethingyyF : $@convention(thin) () -> ()
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// CHECK: apply [[FUNC]]()
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// CHECK: destroy_value [[UNRESOLVED_BINDING]]
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// CHECK: destroy_value [[BOX]]
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// CHECK: } // end sil function '$s18reference_bindings13testBindToVaryyF'
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// SIL: sil hidden @$s18reference_bindings13testBindToVaryyF : $@convention(thin) () -> () {
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// SIL: bb0:
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// SIL: [[BOX:%.*]] = alloc_stack [var_decl] $Int, var, name "x"
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// SIL: [[INOUT_BOX:%.*]] = alloc_stack [var_decl] $Int, var, name "x2"
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// SIL: [[ACCESS:%.*]] = begin_access [modify] [static] [[BOX]]
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// SIL: store {{%.*}} to [[INOUT_BOX]]
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// SIL: [[FUNC:%.*]] = function_ref @$s18reference_bindings11doSomethingyyF : $@convention(thin) () -> ()
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// SIL: apply [[FUNC]]()
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// SIL: store {{%.*}} to [[ACCESS]]
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// SIL: end_access [[ACCESS]]
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// SIL: } // end sil function '$s18reference_bindings13testBindToVaryyF'
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func testBindToVar() {
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var x = 5
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inout x2 = x
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doSomething()
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}
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// CHECK-LABEL: sil hidden [ossa] @$s18reference_bindings15testBindToInOutyySSzF : $@convention(thin) (@inout String) -> () {
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// CHECK: bb0([[ARG:%.*]] : $*String):
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// CHECK: [[BOX:%.*]] = alloc_box ${ var String }
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// CHECK: [[MARK:%.*]] = mark_unresolved_reference_binding [inout] [[BOX]]
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// CHECK: [[LIFETIME:%.*]] = begin_borrow [var_decl] [[MARK]]
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// CHECK: [[PROJECT:%.*]] = project_box [[LIFETIME]]
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// CHECK: [[ACCESS:%.*]] = begin_access [read] [unknown] [[ARG]]
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// CHECK: copy_addr [[ACCESS]] to [init] [[PROJECT]]
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// CHECK: end_access [[ACCESS]]
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// CHECK: apply {{%.*}}()
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// CHECK: destroy_value [[MARK]]
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// CHECK: } // end sil function '$s18reference_bindings15testBindToInOutyySSzF'
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// SIL-LABEL: sil hidden @$s18reference_bindings15testBindToInOutyySSzF : $@convention(thin) (@inout String) -> () {
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// SIL: bb0([[ARG:%.*]] : $*String):
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// SIL: [[STACK:%.*]] = alloc_stack [var_decl] $String
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// SIL: [[ACCESS:%.*]] = begin_access [modify] [static] [[ARG]]
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// SIL: copy_addr [take] [[ACCESS]] to [init] [[STACK]]
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// SIL: apply {{%.*}}
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// SIL: copy_addr [take] [[STACK]] to [init] [[ACCESS]]
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// SIL: end_access [[ACCESS]]
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// SIL: dealloc_stack [[STACK]]
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// SIL: } // end sil function '$s18reference_bindings15testBindToInOutyySSzF'
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func testBindToInOut(_ x: inout String) {
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inout y = x
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doSomething()
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}
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