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966d617625
Constant-propagate the 0 value when loading "count" or "capacity" from the empty Array, Set or Dictionary storage. On high-level SIL this optimization is also done by the ArrayCountPropagation pass, but only for Array. And even for Array it's sometimes needed to propagate the empty-array count when high-level semantics function are already inlined. Fixes an optimization deficiency for empty OptionSet literals. https://bugs.swift.org/browse/SR-12046 rdar://problem/58861171
39 lines
1.2 KiB
Swift
39 lines
1.2 KiB
Swift
// RUN: %target-swift-frontend -emit-sil -O %s | %FileCheck %s
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// RUN: %target-swift-frontend -emit-sil -Osize %s | %FileCheck %s
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// REQUIRES: swift_stdlib_no_asserts,optimized_stdlib
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// This is an end-to-end test if the count and/or capacity from empty
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// array/set/dictionary singletons can be propagated.
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// CHECK-LABEL: sil @{{.*}}testArray
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// CHECK-NOT: global_addr
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// CHECK: [[Z:%[0-9]+]] = integer_literal $Builtin.Int{{[0-9]*}}, 0
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// CHECK: [[I:%[0-9]+]] = struct $Int ([[Z]] : $Builtin.Int{{[0-9]*}})
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// CHECK: return [[I]]
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public func testArray() -> Int {
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let d = Array<Int>()
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return d.count
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}
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// CHECK-LABEL: sil @{{.*}}testDictionary
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// CHECK-NOT: global_addr
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// CHECK: [[Z:%[0-9]+]] = integer_literal $Builtin.Int{{[0-9]*}}, 0
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// CHECK: [[I:%[0-9]+]] = struct $Int ([[Z]] : $Builtin.Int{{[0-9]*}})
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// CHECK: return [[I]]
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public func testDictionary() -> Int {
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let d = Dictionary<Int, Int>()
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return d.count + d.capacity
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}
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// CHECK-LABEL: sil @{{.*}}testSet
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// CHECK-NOT: global_addr
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// CHECK: [[Z:%[0-9]+]] = integer_literal $Builtin.Int{{[0-9]*}}, 0
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// CHECK: [[I:%[0-9]+]] = struct $Int ([[Z]] : $Builtin.Int{{[0-9]*}})
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// CHECK: return [[I]]
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public func testSet() -> Int {
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let d = Set<Int>()
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return d.count + d.capacity
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}
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