llvm/test/CodeGen/X86/win64_vararg.ll

; RUN: llc < %s -mcpu=generic -mtriple=x86_64-pc-win32 | FileCheck %s

; Verify that the var arg parameters which are passed in registers are stored
; in home stack slots allocated by the caller and that AP is correctly
; calculated.
define void @average_va(i32 %count, ...) nounwind {
entry:
; CHECK: pushq
; CHECK: movq   %r9, 40(%rsp)
; CHECK: movq   %r8, 32(%rsp)
; CHECK: movq   %rdx, 24(%rsp)
; CHECK: leaq   24(%rsp), %rax

  %ap = alloca i8*, align 8                       ; <i8**> [#uses=1]
  %ap1 = bitcast i8** %ap to i8*                  ; <i8*> [#uses=1]
  call void @llvm.va_start(i8* %ap1)
  ret void
}

declare void @llvm.va_start(i8*) nounwind
declare void @llvm.va_copy(i8*, i8*) nounwind

; CHECK-LABEL: f5:
; CHECK: pushq
; CHECK: leaq 56(%rsp),
define i8* @f5(i64 %a0, i64 %a1, i64 %a2, i64 %a3, i64 %a4, ...) nounwind {
entry:
  %ap = alloca i8*, align 8
  %ap1 = bitcast i8** %ap to i8*
  call void @llvm.va_start(i8* %ap1)
  ret i8* %ap1
}

; CHECK-LABEL: f4:
; CHECK: pushq
; CHECK: leaq 48(%rsp),
define i8* @f4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
entry:
  %ap = alloca i8*, align 8
  %ap1 = bitcast i8** %ap to i8*
  call void @llvm.va_start(i8* %ap1)
  ret i8* %ap1
}

; CHECK-LABEL: f3:
; CHECK: pushq
; CHECK: leaq 40(%rsp),
define i8* @f3(i64 %a0, i64 %a1, i64 %a2, ...) nounwind {
entry:
  %ap = alloca i8*, align 8
  %ap1 = bitcast i8** %ap to i8*
  call void @llvm.va_start(i8* %ap1)
  ret i8* %ap1
}

; WinX86_64 uses char* for va_list. Verify that the correct amount of bytes
; are copied using va_copy.

; CHECK-LABEL: copy1:
; CHECK: subq $16
; CHECK: leaq 32(%rsp), [[REG_copy1:%[a-z]+]]
; CHECK: movq [[REG_copy1]], 8(%rsp)
; CHECK: movq [[REG_copy1]], (%rsp)
; CHECK: addq $16
; CHECK: ret
define void @copy1(i64 %a0, ...) nounwind {
entry:
  %ap = alloca i8*, align 8
  %cp = alloca i8*, align 8
  %ap1 = bitcast i8** %ap to i8*
  %cp1 = bitcast i8** %cp to i8*
  call void @llvm.va_start(i8* %ap1)
  call void @llvm.va_copy(i8* %cp1, i8* %ap1)
  ret void
}

; CHECK-LABEL: copy4:
; CHECK: subq $16
; CHECK: leaq 56(%rsp), [[REG_copy4:%[a-z]+]]
; CHECK: movq [[REG_copy4]], 8(%rsp)
; CHECK: movq [[REG_copy4]], (%rsp)
; CHECK: addq $16
; CHECK: ret
define void @copy4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
entry:
  %ap = alloca i8*, align 8
  %cp = alloca i8*, align 8
  %ap1 = bitcast i8** %ap to i8*
  %cp1 = bitcast i8** %cp to i8*
  call void @llvm.va_start(i8* %ap1)
  call void @llvm.va_copy(i8* %cp1, i8* %ap1)
  ret void
}

; CHECK-LABEL: arg4:
; CHECK: pushq
; va_start:
; CHECK: leaq 48(%rsp), [[REG_arg4_1:%[a-z]+]]
; CHECK: movq [[REG_arg4_1]], (%rsp)
; va_arg:
; CHECK: leaq 52(%rsp), [[REG_arg4_2:%[a-z]+]]
; CHECK: movq [[REG_arg4_2]], (%rsp)
; CHECK: movl 48(%rsp), %eax
; CHECK: popq
; CHECK: ret
define i32 @arg4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
entry:
  %ap = alloca i8*, align 8
  %ap1 = bitcast i8** %ap to i8*
  call void @llvm.va_start(i8* %ap1)
  %tmp = va_arg i8** %ap, i32
  ret i32 %tmp
}

define void @sret_arg(i32* sret %agg.result, i8* nocapture readnone %format, ...) {
entry:
  %ap = alloca i8*
  %ap_i8 = bitcast i8** %ap to i8*
  call void @llvm.va_start(i8* %ap_i8)
  %tmp = va_arg i8** %ap, i32
  store i32 %tmp, i32* %agg.result
  ret void
}
; CHECK-LABEL: sret_arg:
; CHECK: pushq
; CHECK-DAG: movq %r9, 40(%rsp)
; CHECK-DAG: movq %r8, 32(%rsp)
; CHECK: movl 32(%rsp), %[[tmp:[^ ]*]]
; CHECK: movl %[[tmp]], (%[[sret:[^ ]*]])
; CHECK: movq %[[sret]], %rax
; CHECK: popq
; CHECK: retq