llvm/test/CodeGen/AArch64/arm64-variadic-aapcs.ll

; RUN: llc -aarch64-load-store-renaming=true -verify-machineinstrs -mtriple=arm64-linux-gnu -pre-RA-sched=linearize -enable-misched=false -disable-post-ra < %s | FileCheck %s

%va_list = type {i8*, i8*, i8*, i32, i32}

@var = dso_local global %va_list zeroinitializer, align 8

declare void @llvm.va_start(i8*)

define dso_local void @test_simple(i32 %n, ...) {
; CHECK-LABEL: test_simple:
; CHECK: sub sp, sp, #[[STACKSIZE:[0-9]+]]
; CHECK: add [[STACK_TOP:x[0-9]+]], sp, #[[STACKSIZE]]

; CHECK: adrp x[[VA_LIST_HI:[0-9]+]], var
; CHECK: add x[[VA_LIST:[0-9]+]], {{x[0-9]+}}, :lo12:var

; CHECK-DAG: stp x6, x7, [sp, #
; ... omit middle ones ...
; CHECK-DAG: str x1, [sp, #[[GR_BASE:[0-9]+]]]

; CHECK-DAG: stp q0, q1, [sp]
; ... omit middle ones ...
; CHECK-DAG: stp q6, q7, [sp, #

; CHECK: str [[STACK_TOP]], [x[[VA_LIST]]]

; CHECK: add [[GR_TOPTMP:x[0-9]+]], sp, #[[GR_BASE]]
; CHECK: add [[GR_TOP:x[0-9]+]], [[GR_TOPTMP]], #56


; CHECK: mov [[VR_TOPTMP:x[0-9]+]], sp
; CHECK: add [[VR_TOP:x[0-9]+]], [[VR_TOPTMP]], #128
; CHECK: stp [[GR_TOP]], [[VR_TOP]], [x[[VA_LIST]], #8]

; CHECK: mov     [[GRVR:x[0-9]+]], #-56
; CHECK: movk    [[GRVR]], #65408, lsl #32
; CHECK: str     [[GRVR]], [x[[VA_LIST]], #24]

  %addr = bitcast %va_list* @var to i8*
  call void @llvm.va_start(i8* %addr)

  ret void
}

define dso_local void @test_fewargs(i32 %n, i32 %n1, i32 %n2, float %m, ...) {
; CHECK-LABEL: test_fewargs:
; CHECK: sub sp, sp, #[[STACKSIZE:[0-9]+]]
; CHECK: add [[STACK_TOP:x[0-9]+]], sp, #[[STACKSIZE]]

; CHECK: adrp x[[VA_LIST_HI:[0-9]+]], var
; CHECK: add x[[VA_LIST:[0-9]+]], {{x[0-9]+}}, :lo12:var

; CHECK-DAG: stp x6, x7, [sp, #
; ... omit middle ones ...
; CHECK-DAG: str x3, [sp, #[[GR_BASE:[0-9]+]]]

; CHECK-DAG: stp q6, q7, [sp, #80]
; ... omit middle ones ...
; CHECK-DAG: str q1, [sp]

; CHECK: str [[STACK_TOP]], [x[[VA_LIST]]]

; CHECK: add [[GR_TOPTMP:x[0-9]+]], sp, #[[GR_BASE]]
; CHECK: add [[GR_TOP:x[0-9]+]], [[GR_TOPTMP]], #40

; CHECK: mov [[VR_TOPTMP:x[0-9]+]], sp
; CHECK: add [[VR_TOP:x[0-9]+]], [[VR_TOPTMP]], #112
; CHECK: stp [[GR_TOP]], [[VR_TOP]], [x[[VA_LIST]], #8]

; CHECK: mov  [[GRVR_OFFS:x[0-9]+]], #-40
; CHECK: movk [[GRVR_OFFS]], #65424, lsl #32
; CHECK: str  [[GRVR_OFFS]], [x[[VA_LIST]], #24]

  %addr = bitcast %va_list* @var to i8*
  call void @llvm.va_start(i8* %addr)

  ret void
}

define dso_local void @test_nospare([8 x i64], [8 x float], ...) {
; CHECK-LABEL: test_nospare:

  %addr = bitcast %va_list* @var to i8*
  call void @llvm.va_start(i8* %addr)
; CHECK-NOT: sub sp, sp
; CHECK: mov [[STACK:x[0-9]+]], sp
; CHECK: add x[[VAR:[0-9]+]], {{x[0-9]+}}, :lo12:var
; CHECK: str [[STACK]], [x[[VAR]]]

  ret void
}

; If there are non-variadic arguments on the stack (here two i64s) then the
; __stack field should point just past them.
define dso_local void @test_offsetstack([8 x i64], [2 x i64], [3 x float], ...) {
; CHECK-LABEL: test_offsetstack:

; CHECK-DAG: stp {{q[0-9]+}}, {{q[0-9]+}}, [sp, #48]
; CHECK-DAG: stp {{q[0-9]+}}, {{q[0-9]+}}, [sp, #16]
; CHECK-DAG: str {{q[0-9]+}}, [sp]
; CHECK-DAG: add [[STACK_TOP:x[0-9]+]], sp, #96
; CHECK-DAG: add x[[VAR:[0-9]+]], {{x[0-9]+}}, :lo12:var
; CHECK-DAG: str [[STACK_TOP]], [x[[VAR]]]

  %addr = bitcast %va_list* @var to i8*
  call void @llvm.va_start(i8* %addr)
  ret void
}

declare void @llvm.va_end(i8*)

define dso_local void @test_va_end() nounwind {
; CHECK-LABEL: test_va_end:
; CHECK-NEXT: %bb.0

  %addr = bitcast %va_list* @var to i8*
  call void @llvm.va_end(i8* %addr)

  ret void
; CHECK-NEXT: ret
}

declare void @llvm.va_copy(i8* %dest, i8* %src)

@second_list = dso_local global %va_list zeroinitializer

define dso_local void @test_va_copy() {
; CHECK-LABEL: test_va_copy:
  %srcaddr = bitcast %va_list* @var to i8*
  %dstaddr = bitcast %va_list* @second_list to i8*
  call void @llvm.va_copy(i8* %dstaddr, i8* %srcaddr)

; CHECK: add x[[SRC:[0-9]+]], {{x[0-9]+}}, :lo12:var

; CHECK: ldr [[BLOCKB:q[0-9]+]], [x[[SRC]], #16]
; CHECK: add x[[DST:[0-9]+]], {{x[0-9]+}}, :lo12:second_list
; CHECK: ldr [[BLOCKA:q[0-9]+]], [x[[SRC]]]
; CHECK: stp [[BLOCKA]], [[BLOCKB]], [x[[DST]]]
  ret void
; CHECK: ret
}