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; RUN: llc -mtriple x86_64-unknown-windows-msvc %s -o - | FileCheck %s
declare swifttailcc void @callee()
define swifttailcc void @swift_tail() {
call void asm "","~{r14}"()
tail call swifttailcc void @callee()
ret void
}
; CHECK-LABEL: swift_tail:
; CHECK-NOT: popq %r14
define void @has_swift_async(i8* swiftasync %contet) {
call void asm "","~{r14}"()
ret void
}
; CHECK-LABEL: has_swift_async:
; CHECK: popq %r14
; It's impossible to get a tail call from a function without a swiftasync
; parameter to one with unless the CC is swifttailcc. So it doesn't matter
; whether r14 is callee-saved in this case.
define void @calls_swift_async() {
call void asm "","~{r14}"()
tail call void @has_swift_async(i8* swiftasync null)
ret void
}
; CHECK-LABEL: calls_swift_async:
; CHECK-NOT jmpq has_swift_async
define swifttailcc void @no_preserve_swiftself() {
call void asm "","~{r13}"()
ret void
}
; CHECK-LABEL: no_preserve_swiftself:
; CHECK-NOT: popq %r13
declare swifttailcc i8* @swift_self(i8* swiftasync %context, i8* swiftself %self)
define swiftcc i8* @call_swift_self(i8* swiftself %self, i8* %context) {
; call void asm "","~{r13}"()
; We get a push r13 but why not with the call below?
%res = call swifttailcc i8* @swift_self(i8* swiftasync %context, i8* swiftself %self)
ret i8* %res
}
; CHECK-LABEL: call_swift_self:
; CHECK: pushq %r13
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