Imported Upstream version 5.18.0.225

Former-commit-id: 10196d987d5fc5564b9d3b33b1fdf13190f4d0b5

external/llvm/test/CodeGen/AArch64/tailcall-implicit-sret.ll

@@ -0,0 +1,46 @@
+; RUN: llc < %s -mtriple arm64-apple-darwin -aarch64-enable-ldst-opt=false -disable-post-ra -asm-verbose=false | FileCheck %s
+; Disable the load/store optimizer to avoid having LDP/STPs and simplify checks.
+
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+
+; Check that we don't try to tail-call with an sret-demoted return.
+
+declare i1024 @test_sret() #0
+
+; CHECK-LABEL: _test_call_sret:
+; CHECK: mov  x[[CALLERX8NUM:[0-9]+]], x8
+; CHECK: mov  x8, sp
+; CHECK-NEXT: bl _test_sret
+; CHECK: ldr [[CALLERSRET1:q[0-9]+]], [sp]
+; CHECK: str [[CALLERSRET1:q[0-9]+]], [x[[CALLERX8NUM]]]
+; CHECK: ret
+define i1024 @test_call_sret() #0 {
+  %a = call i1024 @test_sret()
+  ret i1024 %a
+}
+
+; CHECK-LABEL: _test_tailcall_sret:
+; CHECK: mov  x[[CALLERX8NUM:[0-9]+]], x8
+; CHECK: mov  x8, sp
+; CHECK-NEXT: bl _test_sret
+; CHECK: ldr [[CALLERSRET1:q[0-9]+]], [sp]
+; CHECK: str [[CALLERSRET1:q[0-9]+]], [x[[CALLERX8NUM]]]
+; CHECK: ret
+define i1024 @test_tailcall_sret() #0 {
+  %a = tail call i1024 @test_sret()
+  ret i1024 %a
+}
+
+; CHECK-LABEL: _test_indirect_tailcall_sret:
+; CHECK: mov  x[[CALLERX8NUM:[0-9]+]], x8
+; CHECK: mov  x8, sp
+; CHECK-NEXT: blr x0
+; CHECK: ldr [[CALLERSRET1:q[0-9]+]], [sp]
+; CHECK: str [[CALLERSRET1:q[0-9]+]], [x[[CALLERX8NUM]]]
+; CHECK: ret
+define i1024 @test_indirect_tailcall_sret(i1024 ()* %f) #0 {
+  %a = tail call i1024 %f()
+  ret i1024 %a
+}
+
+attributes #0 = { nounwind }