derek.holloway
7502bf64a4
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53 lines
1.4 KiB
LLVM
53 lines
1.4 KiB
LLVM
; RUN: llc -mtriple x86_64-unknown-windows-msvc %s -o - | FileCheck %s
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declare swifttailcc void @callee()
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define swifttailcc void @swift_tail() {
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call void asm "","~{r14}"()
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tail call swifttailcc void @callee()
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ret void
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}
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; CHECK-LABEL: swift_tail:
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; CHECK-NOT: popq %r14
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define void @has_swift_async(ptr swiftasync %contet) {
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call void asm "","~{r14}"()
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ret void
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}
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; CHECK-LABEL: has_swift_async:
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; CHECK: popq %r14
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; It's impossible to get a tail call from a function without a swiftasync
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; parameter to one with unless the CC is swifttailcc. So it doesn't matter
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; whether r14 is callee-saved in this case.
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define void @calls_swift_async() {
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call void asm "","~{r14}"()
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tail call void @has_swift_async(ptr swiftasync null)
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ret void
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}
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; CHECK-LABEL: calls_swift_async:
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; CHECK-NOT: jmpq has_swift_async
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define swifttailcc void @no_preserve_swiftself() {
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call void asm "","~{r13}"()
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ret void
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}
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; CHECK-LABEL: no_preserve_swiftself:
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; CHECK-NOT: popq %r13
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declare swifttailcc ptr @swift_self(ptr swiftasync %context, ptr swiftself %self)
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define swiftcc ptr @call_swift_self(ptr swiftself %self, ptr %context) {
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; call void asm "","~{r13}"()
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; We get a push r13 but why not with the call below?
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%res = call swifttailcc ptr @swift_self(ptr swiftasync %context, ptr swiftself %self)
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ret ptr %res
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}
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; CHECK-LABEL: call_swift_self:
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; CHECK: pushq %r13
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