1; RUN: llc -mtriple x86_64-unknown-windows-msvc %s -o - | FileCheck %s 2 3declare swifttailcc void @callee() 4 5define swifttailcc void @swift_tail() { 6 call void asm "","~{r14}"() 7 tail call swifttailcc void @callee() 8 ret void 9} 10 11; CHECK-LABEL: swift_tail: 12; CHECK-NOT: popq %r14 13 14define void @has_swift_async(ptr swiftasync %contet) { 15 call void asm "","~{r14}"() 16 ret void 17} 18 19; CHECK-LABEL: has_swift_async: 20; CHECK: popq %r14 21 22; It's impossible to get a tail call from a function without a swiftasync 23; parameter to one with unless the CC is swifttailcc. So it doesn't matter 24; whether r14 is callee-saved in this case. 25define void @calls_swift_async() { 26 call void asm "","~{r14}"() 27 tail call void @has_swift_async(ptr swiftasync null) 28 ret void 29} 30 31; CHECK-LABEL: calls_swift_async: 32; CHECK-NOT: jmpq has_swift_async 33 34define swifttailcc void @no_preserve_swiftself() { 35 call void asm "","~{r13}"() 36 ret void 37} 38 39; CHECK-LABEL: no_preserve_swiftself: 40; CHECK-NOT: popq %r13 41 42declare swifttailcc ptr @swift_self(ptr swiftasync %context, ptr swiftself %self) 43 44define swiftcc ptr @call_swift_self(ptr swiftself %self, ptr %context) { 45 ; call void asm "","~{r13}"() 46 ; We get a push r13 but why not with the call below? 47 %res = call swifttailcc ptr @swift_self(ptr swiftasync %context, ptr swiftself %self) 48 ret ptr %res 49} 50 51; CHECK-LABEL: call_swift_self: 52; CHECK: pushq %r13 53