forked from OSchip/llvm-project
68 lines
2.2 KiB
LLVM
68 lines
2.2 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=aarch64-apple-ios -o - %s | FileCheck --check-prefix=CHECK --check-prefix=OPT %s
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; RUN: llc -O0 -verify-machineinstrs -mtriple=aarch64-apple-ios -o - %s | FileCheck %s
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; RUN: llc -verify-machineinstrs -mtriple=aarch64-unknown-linux-gnu -o - %s | FileCheck --check-prefix=CHECK --check-prefix=OPT %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 i8* @swiftself_param(i8* swiftself %addr0) {
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ret i8 *%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 i8 *@call_swiftself(i8* %arg) {
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%res = call i8 *@swiftself_param(i8* swiftself %arg)
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ret i8 *%res
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}
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; x20 should be saved by the callee even if used for swiftself
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; CHECK-LABEL: swiftself_clobber:
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; CHECK: {{stp|str}} {{.*}}x20{{.*}}sp
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; ...
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; CHECK: {{ldp|ldr}} {{.*}}x20{{.*}}sp
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; CHECK: ret
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define i8 *@swiftself_clobber(i8* swiftself %addr0) {
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call void asm sideeffect "", "~{x20}"()
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ret i8 *%addr0
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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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; OPT-NOT: mov{{.*}}x20
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; OPT: bl {{_?}}swiftself_param
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; OPT-NOT: mov{{.*}}x20
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; OPT-NEXT: bl {{_?}}swiftself_param
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; OPT: ret
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define void @swiftself_passthrough(i8* swiftself %addr0) {
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call i8 *@swiftself_param(i8* swiftself %addr0)
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call i8 *@swiftself_param(i8* swiftself %addr0)
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ret void
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}
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; We can use a tail call if the callee swiftself is the same as the caller one.
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; CHECK-LABEL: swiftself_tail:
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; OPT: b {{_?}}swiftself_param
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; OPT-NOT: ret
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define i8* @swiftself_tail(i8* swiftself %addr0) {
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call void asm sideeffect "", "~{x20}"()
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%res = tail call i8* @swiftself_param(i8* swiftself %addr0)
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ret i8* %res
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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 i8* @swiftself_notail(i8* swiftself %addr0, i8* %addr1) nounwind {
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%res = tail call i8* @swiftself_param(i8* swiftself %addr1)
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ret i8* %res
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}
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