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e574aa765f
Switch statements generate at least one anonymous match variable per case, which consumes both a lot of stack space and an explosion of range extension depencies due to the way case statements are scoped. rdar://problem/34326355
59 lines
1.8 KiB
Swift
59 lines
1.8 KiB
Swift
// RUN: %target-swift-frontend %s -emit-ir -g -o - | %FileCheck %s
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@_fixed_layout
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public struct UnicodeScalar {
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var _value: UInt32
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public var value: UInt32 { return _value }
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}
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public func mangle(s: [UnicodeScalar]) -> [UnicodeScalar] {
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let replacementUnichar = UnicodeScalar(_value: 0)
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var mangledUnichars: [UnicodeScalar] = s.map {
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switch $0.value {
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case
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// A-Z
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0x0041...0x005A,
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// a-z
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0x0061...0x007A,
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// 0-9
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0x0030...0x0039,
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// _
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0x005F,
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// Latin (1)
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0x00AA...0x00AA:
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return $0
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default:
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return replacementUnichar
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}
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}
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return mangledUnichars
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}
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// The patterns in the first case statement each define an anonymous variable,
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// which shares the storage with the expression in the switch statement. Make
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// sure we emit a dbg.value once per basic block.
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// CHECK: define {{.*}}@_T011patternvars6mangleSayAA13UnicodeScalarVGAE1s_tFA2DcfU_
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// CHECK: %[[VAL:[0-9]+]] = call swiftcc i32 @_T011patternvars13UnicodeScalarV5values6UInt32Vvg(i32 %0)
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// CHECK-NEXT: call void @llvm.dbg.value(metadata i32 %[[VAL]]
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// CHECK: ; <label>
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// CHECK: call void @llvm.dbg.value(metadata i32 %[[VAL]]
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// CHECK-NOT: call void @llvm.dbg.value
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// CHECK-NOT: call void asm sideeffect "", "r"
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// CHECK: ; <label>
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// CHECK: call void @llvm.dbg.value(metadata i32 %[[VAL]]
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// CHECK-NOT: call void @llvm.dbg.value
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// CHECK-NOT: call void asm sideeffect "", "r"
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// CHECK: ; <label>
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// CHECK: call void @llvm.dbg.value(metadata i32 %[[VAL]]
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// CHECK-NOT: call void @llvm.dbg.value
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// CHECK-NOT: call void asm sideeffect "", "r"
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// CHECK: ; <label>
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// CHECK: call void @llvm.dbg.value(metadata i32 %[[VAL]]
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// CHECK-NOT: call void @llvm.dbg.value
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// CHECK-NOT: call void asm sideeffect "", "r"
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