forked from OSchip/llvm-project
87 lines
2.9 KiB
LLVM
87 lines
2.9 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 -fast-isel -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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; This should also work with fast-isel.
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; CHECK-LABEL: swiftself_tail:
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; CHECK: b {{_?}}swiftself_param
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; CHECK-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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; We cannot pretend that 'x0' is alive across the thisreturn_attribute call as
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; we normally would. We marked the first parameter with swiftself which means it
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; will no longer be passed in x0.
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declare swiftcc i8* @thisreturn_attribute(i8* returned swiftself)
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; OPT-LABEL: swiftself_nothisreturn:
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; OPT-DAG: ldr x20, [x20]
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; OPT-DAG: mov [[CSREG:x[1-9].*]], x8
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; OPT: bl {{_?}}thisreturn_attribute
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; OPT: str x0, {{\[}}[[CSREG]]
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; OPT: ret
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define hidden swiftcc void @swiftself_nothisreturn(i8** noalias nocapture sret, i8** noalias nocapture readonly swiftself) {
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entry:
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%2 = load i8*, i8** %1, align 8
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%3 = tail call swiftcc i8* @thisreturn_attribute(i8* swiftself %2)
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store i8* %3, i8** %0, align 8
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ret void
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}
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