llvm/test/CodeGen/X86/win64-tailcall-memory.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
; RUN: llc -mtriple=x86_64-unknown-windows-gnu < %s | FileCheck %s

; Check calling convention is correct for win64 when doing a tailcall
; for a pointer loaded from memory.

declare void @foo(i64, ptr)

define void @do_tailcall(ptr %objp) nounwind {
; CHECK-LABEL: do_tailcall:
; CHECK:       # %bb.0:
; CHECK-NEXT:    pushq %rsi
; CHECK-NEXT:    subq $32, %rsp
; CHECK-NEXT:    movq %rcx, %rsi
; CHECK-NEXT:    xorl %ecx, %ecx
; CHECK-NEXT:    xorl %edx, %edx
; CHECK-NEXT:    callq foo
; CHECK-NEXT:    xorl %ecx, %ecx
; CHECK-NEXT:    movq %rsi, %rax
; CHECK-NEXT:    addq $32, %rsp
; CHECK-NEXT:    popq %rsi
; CHECK-NEXT:    rex64 jmpq *(%rax) # TAILCALL
  tail call void @foo(i64 0, ptr null)
  %fptr = load ptr, ptr %objp, align 8
  tail call void %fptr(ptr null)
  ret void
}

; Make sure aliases of ccc are also treated as win64 functions
define fastcc void @do_tailcall_fastcc(ptr %objp) nounwind {
; CHECK-LABEL: do_tailcall_fastcc:
; CHECK:       # %bb.0:
; CHECK-NEXT:    pushq %rsi
; CHECK-NEXT:    subq $32, %rsp
; CHECK-NEXT:    movq %rcx, %rsi
; CHECK-NEXT:    xorl %ecx, %ecx
; CHECK-NEXT:    xorl %edx, %edx
; CHECK-NEXT:    callq foo
; CHECK-NEXT:    xorl %ecx, %ecx
; CHECK-NEXT:    movq %rsi, %rax
; CHECK-NEXT:    addq $32, %rsp
; CHECK-NEXT:    popq %rsi
; CHECK-NEXT:    rex64 jmpq *(%rax) # TAILCALL
  tail call void @foo(i64 0, ptr null)
  %fptr = load ptr, ptr %objp, align 8
  tail call fastcc void %fptr(ptr null)
  ret void
}