; RUN: llc -verify-machineinstrs -mtriple=aarch64-apple-ios -o - %s | FileCheck --check-prefix=CHECK --check-prefix=OPT --check-prefix=OPTAARCH64 %s ; RUN: llc -O0 -fast-isel -verify-machineinstrs -mtriple=aarch64-apple-ios -o - %s | FileCheck %s ; RUN: llc -verify-machineinstrs -mtriple=aarch64-unknown-linux-gnu -o - %s | FileCheck --check-prefix=CHECK --check-prefix=OPT --check-prefix=OPTAARCH64 %s ; RUN: llc -verify-machineinstrs -mtriple=arm64_32-apple-ios -o - %s | FileCheck --check-prefix=CHECK --check-prefix=OPT --check-prefix=OPTARM64_32 %s ; Parameter with swiftself should be allocated to x20. ; CHECK-LABEL: swiftself_param: ; CHECK: mov x0, x20 ; CHECK-NEXT: ret define ptr @swiftself_param(ptr swiftself %addr0) { ret ptr %addr0 } ; Check that x20 is used to pass a swiftself argument. ; CHECK-LABEL: call_swiftself: ; CHECK: mov x20, x0 ; CHECK: bl {{_?}}swiftself_param ; CHECK: ret define ptr @call_swiftself(ptr %arg) { %res = call ptr @swiftself_param(ptr swiftself %arg) ret ptr %res } ; x20 should be saved by the callee even if used for swiftself ; CHECK-LABEL: swiftself_clobber: ; CHECK: {{stp|str}} {{.*}}x20{{.*}}sp ; ... ; CHECK: {{ldp|ldr}} {{.*}}x20{{.*}}sp ; CHECK: ret define ptr @swiftself_clobber(ptr swiftself %addr0) { call void asm sideeffect "", "~{x20}"() ret ptr %addr0 } ; Demonstrate that we do not need any movs when calling multiple functions ; with swiftself argument. ; CHECK-LABEL: swiftself_passthrough: ; OPT-NOT: mov{{.*}}x20 ; OPT: bl {{_?}}swiftself_param ; OPT-NOT: mov{{.*}}x20 ; OPT-NEXT: bl {{_?}}swiftself_param ; OPT: ret define void @swiftself_passthrough(ptr swiftself %addr0) { call ptr @swiftself_param(ptr swiftself %addr0) call ptr @swiftself_param(ptr swiftself %addr0) ret void } ; We can use a tail call if the callee swiftself is the same as the caller one. ; This should also work with fast-isel. ; CHECK-LABEL: swiftself_tail: ; OPTAARCH64: b {{_?}}swiftself_param ; OPTAARCH64-NOT: ret ; OPTARM64_32: b {{_?}}swiftself_param define ptr @swiftself_tail(ptr swiftself %addr0) { call void asm sideeffect "", "~{x20}"() %res = musttail call ptr @swiftself_param(ptr swiftself %addr0) ret ptr %res } ; We can not use a tail call if the callee swiftself is not the same as the ; caller one. ; CHECK-LABEL: swiftself_notail: ; CHECK: mov x20, x0 ; CHECK: bl {{_?}}swiftself_param ; CHECK: ret define ptr @swiftself_notail(ptr swiftself %addr0, ptr %addr1) nounwind { %res = tail call ptr @swiftself_param(ptr swiftself %addr1) ret ptr %res } ; We cannot pretend that 'x0' is alive across the thisreturn_attribute call as ; we normally would. We marked the first parameter with swiftself which means it ; will no longer be passed in x0. declare swiftcc ptr @thisreturn_attribute(ptr returned swiftself) ; OPTAARCH64-LABEL: swiftself_nothisreturn: ; OPTAARCH64-DAG: ldr x20, [x20] ; OPTAARCH64-DAG: mov [[CSREG:x[1-9].*]], x8 ; OPTAARCH64: bl {{_?}}thisreturn_attribute ; OPTAARCH64: str x0, [[[CSREG]] ; OPTAARCH64: ret ; OPTARM64_32-LABEL: swiftself_nothisreturn: ; OPTARM64_32-DAG: ldr w20, [x20] ; OPTARM64_32-DAG: mov [[CSREG:x[1-9].*]], x8 ; OPTARM64_32: bl {{_?}}thisreturn_attribute ; OPTARM64_32: str w0, [[[CSREG]] ; OPTARM64_32: ret define hidden swiftcc void @swiftself_nothisreturn(ptr noalias nocapture sret(ptr), ptr noalias nocapture readonly swiftself) { entry: %2 = load ptr, ptr %1, align 8 %3 = tail call swiftcc ptr @thisreturn_attribute(ptr swiftself %2) store ptr %3, ptr %0, align 8 ret void }