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198d4ab0bb
Introduce a new pass MandatoryTempRValueElimination, which works as the original TempRValueElimination, except that it does not remove any alloc_stack instruction which are associated with source variables. Running this pass at Onone helps to reduce copies of large structs, e.g. InlineArrays or structs containing InlineArrays. Copying large structs can be a performance problem, even at Onone. rdar://151629149
28 lines
1.1 KiB
Swift
28 lines
1.1 KiB
Swift
// RUN: %target-swift-frontend -Xllvm -sil-disable-pass=mandatory-temp-rvalue-elimination -emit-ir %s -target %target-swift-5.9-abi-triple | %FileCheck %s -DINT=i%target-ptrsize
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public struct G<T> {}
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public struct GG<each T> {
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var elements: (repeat G<each T>)
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public func doStuff(input: repeat each T) {
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_ = (repeat each input)
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}
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}
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// CHECK-LABEL: define{{( dllexport)?}}{{( protected)?}} swiftcc void @"$s28variadic_generic_fulfillment2GGV7doStuff5inputyxxQp_tF"(ptr noalias %0, ptr %"GG<repeat each T>", ptr noalias swiftself %1)
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// CHECK: [[T_PTR:%.*]] = getelementptr inbounds ptr, ptr %"GG<repeat each T>"
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// CHECK: [[T:%.*]] = load ptr, ptr [[T_PTR]]
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// CHECK: [[INDEX:%.*]] = phi [[INT]] [ 0, %entry ], [ {{%.*}}, {{%.*}} ]
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// Make sure we mask off the LSB since we have an on-heap pack here.
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// CHECK: [[T_ADDR:%.*]] = ptrtoint ptr [[T]] to [[INT]]
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// CHECK-NEXT: [[T_ADDR2:%.*]] = and [[INT]] [[T_ADDR]], -2
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// CHECK-NEXT: [[T2:%.*]] = inttoptr [[INT]] [[T_ADDR2]] to ptr
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// CHECK-NEXT: [[T_ELT_PTR:%.*]] = getelementptr inbounds ptr, ptr [[T2]], [[INT]] [[INDEX]]
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// CHECK-NEXT: [[T_ELT:%.*]] = load ptr, ptr [[T_ELT_PTR]]
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// CHECK: ret void
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