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Previously, whenever an alloc_box that was promoted to an alloc_stack, the new alloc_stack would be lexical. The result was that alloc_boxes which didn't need (or explicitly didn't want, in the case of eager move vars) received lexical alloc_stacks. Here, only add the lexical flag to the new alloc_stack instruction if any of the box's uses are `begin_borrow [lexical]`. That way, alloc_boxes end up having lexical alloc_stacks only if they were "lexical alloc_boxes".
53 lines
1.3 KiB
Plaintext
53 lines
1.3 KiB
Plaintext
// RUN: %target-sil-opt -enable-sil-verify-all %s -allocbox-to-stack -enable-lexical-lifetimes | %FileCheck %s
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sil_stage raw
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import Builtin
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struct Int {
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var _value: Builtin.Int64
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}
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struct Bool {
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var _value: Builtin.Int1
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}
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protocol Error {}
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// CHECK-LABEL: sil [ossa] @promote_nonlexical
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// CHECK: alloc_stack $
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// CHECK-NOT: alloc_box
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// CHECK-NOT: destroy_value
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// CHECK: return
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// CHECK-LABEL: } // end sil function 'promote_nonlexical'
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sil [ossa] @promote_nonlexical : $@convention(thin) (Int) -> Int {
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bb0(%0 : $Int):
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%1 = alloc_box ${ var Int }
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%1a = project_box %1 : ${ var Int }, 0
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store %0 to [trivial] %1a : $*Int
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%3 = load [trivial] %1a : $*Int
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destroy_value %1 : ${ var Int }
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return %3 : $Int
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}
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// CHECK-LABEL: sil [ossa] @promote_lexical
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// CHECK: alloc_stack [lexical]
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// CHECK-NOT: alloc_box
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// CHECK-NOT: destroy_value
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// CHECK: return
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// CHECK-LABEL: } // end sil function 'promote_lexical'
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sil [ossa] @promote_lexical : $@convention(thin) (Int) -> Int {
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bb0(%0 : $Int):
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%1 = alloc_box ${ var Int }
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%b = begin_borrow [lexical] %1 : ${ var Int }
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%1a = project_box %b : ${ var Int }, 0
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store %0 to [trivial] %1a : $*Int
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%3 = load [trivial] %1a : $*Int
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end_borrow %b : ${ var Int }
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destroy_value %1 : ${ var Int }
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return %3 : $Int
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}
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