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and simplify the initialization code by emitting a memset intrinsic. rdar://problem/43566087
29 lines
972 B
Swift
29 lines
972 B
Swift
// RUN: %target-swift-frontend %s -emit-ir -g -o - | %FileCheck %s
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func markUsed<T>(_ t: T) {}
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func foo(_ x: inout Int64) {
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// Make sure the shadow copy is being made in the prologue or (at
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// line 0), but the code to load the value from the inout storage is
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// not.
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// CHECK: %[[X:.*]] = alloca %Ts5Int64V*, align {{(4|8)}}
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// CHECK-NEXT: call void @llvm.dbg.declare
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// CHECK-NEXT: %[[ZEROED:[0-9]+]] = bitcast %Ts5Int64V** %[[X]] to i8*{{$}}
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// CHECK-NEXT: call void @llvm.memset.{{.*}}(i8* align {{(4|8)}} %[[ZEROED]], i8 0
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// CHECK: store %Ts5Int64V* %0, %Ts5Int64V** %[[X]], align {{(4|8)}}
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// CHECK-SAME: !dbg ![[LOC0:.*]]
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// CHECK-NEXT: getelementptr inbounds %Ts5Int64V, %Ts5Int64V* %0, i32 0, i32 0,
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// CHECK-SAME: !dbg ![[LOC1:.*]]
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// CHECK: ![[LOC0]] = !DILocation(line: 0,
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// CHECK: ![[LOC1]] = !DILocation(line: [[@LINE+1]],
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x = x + 2
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}
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func main() {
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var x : Int64 = 1
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foo(&x)
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markUsed("break here to see \(x)")
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}
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main()
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