derek.holloway
7502bf64a4
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74 lines
2.4 KiB
LLVM
74 lines
2.4 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=aarch64-apple-ios -o - %s -global-isel | FileCheck %s
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; Parameter with swiftself should be allocated to x20.
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; CHECK-LABEL: swiftself_param:
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; CHECK: mov x0, x20
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; CHECK-NEXT: ret
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define ptr @swiftself_param(ptr swiftself %addr0) {
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ret ptr %addr0
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}
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; Check that x20 is used to pass a swiftself argument.
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; CHECK-LABEL: call_swiftself:
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; CHECK: mov x20, x0
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; CHECK: bl {{_?}}swiftself_param
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; CHECK: ret
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define ptr @call_swiftself(ptr %arg) {
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%res = call ptr @swiftself_param(ptr swiftself %arg)
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ret ptr %res
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}
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; Demonstrate that we do not need any movs when calling multiple functions
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; with swiftself argument.
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; CHECK-LABEL: swiftself_passthrough:
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; CHECK-NOT: mov{{.*}}x20
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; CHECK: bl {{_?}}swiftself_param
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; CHECK-NOT: mov{{.*}}x20
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; CHECK-NEXT: bl {{_?}}swiftself_param
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; CHECK: ret
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define void @swiftself_passthrough(ptr swiftself %addr0) {
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call ptr @swiftself_param(ptr swiftself %addr0)
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call ptr @swiftself_param(ptr swiftself %addr0)
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ret void
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}
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; We can not use a tail call if the callee swiftself is not the same as the
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; caller one.
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; CHECK-LABEL: swiftself_notail:
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; CHECK: mov x20, x0
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; CHECK: bl {{_?}}swiftself_param
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; CHECK: ret
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define ptr @swiftself_notail(ptr swiftself %addr0, ptr %addr1) nounwind {
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%res = tail call ptr @swiftself_param(ptr swiftself %addr1)
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ret ptr %res
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}
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; We cannot pretend that 'x0' is alive across the thisreturn_attribute call as
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; we normally would. We marked the first parameter with swiftself which means it
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; will no longer be passed in x0.
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declare swiftcc ptr @thisreturn_attribute(ptr returned swiftself)
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; CHECK-LABEL: swiftself_nothisreturn:
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; CHECK-DAG: ldr x20, [x20]
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; CHECK-DAG: mov [[CSREG:x[1-9].*]], x8
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; CHECK: bl {{_?}}thisreturn_attribute
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; CHECK: str x0, [[[CSREG]]
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; CHECK: ret
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define hidden swiftcc void @swiftself_nothisreturn(ptr noalias nocapture sret(ptr), ptr noalias nocapture readonly swiftself) {
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entry:
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%2 = load ptr, ptr %1, align 8
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%3 = tail call swiftcc ptr @thisreturn_attribute(ptr swiftself %2)
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store ptr %3, ptr %0, align 8
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ret void
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}
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; Check that x20 is used to pass a swiftself argument when the parameter is
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; only in the declaration's arguments.
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; CHECK-LABEL: _swiftself_not_on_call_params:
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; CHECK: mov x20, x0
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; CHECK: bl {{_?}}swiftself_param
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; CHECK: ret
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define ptr @swiftself_not_on_call_params(ptr %arg) {
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%res = call ptr @swiftself_param(ptr %arg)
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ret ptr %res
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}
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