[Tests] Add a test showing how we handle overaligned allocas w/ no-realign-stack

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py

; RUN: llc < %s -mtriple=x86_64-pc-linux -mcpu=skylake | FileCheck %s

declare void @capture(i64*)

define void @test_natural() "no-realign-stack" {

; CHECK-LABEL: test_natural:

; CHECK:       # %bb.0:

; CHECK-NEXT:    pushq %rax

; CHECK-NEXT:    .cfi_def_cfa_offset 16

; CHECK-NEXT:    movq %rsp, %rdi

; CHECK-NEXT:    callq capture

; CHECK-NEXT:    popq %rax

; CHECK-NEXT:    .cfi_def_cfa_offset 8

; CHECK-NEXT:    retq

  %a = alloca i64

  call void @capture(i64* %a)

  ret void

}

define void @test_realign() {

; CHECK-LABEL: test_realign:

; CHECK:       # %bb.0:

; CHECK-NEXT:    pushq %rbp

; CHECK-NEXT:    .cfi_def_cfa_offset 16

; CHECK-NEXT:    .cfi_offset %rbp, -16

; CHECK-NEXT:    movq %rsp, %rbp

; CHECK-NEXT:    .cfi_def_cfa_register %rbp

; CHECK-NEXT:    andq $-64, %rsp

; CHECK-NEXT:    subq $64, %rsp

; CHECK-NEXT:    movq %rsp, %rdi

; CHECK-NEXT:    callq capture

; CHECK-NEXT:    movq %rbp, %rsp

; CHECK-NEXT:    popq %rbp

; CHECK-NEXT:    .cfi_def_cfa %rsp, 8

; CHECK-NEXT:    retq

  %a = alloca i64, align 64

  call void @capture(i64* %a)

  ret void

}

define void @test_norealign() "no-realign-stack" {

; CHECK-LABEL: test_norealign:

; CHECK:       # %bb.0:

; CHECK-NEXT:    pushq %rax

; CHECK-NEXT:    .cfi_def_cfa_offset 16

; CHECK-NEXT:    movq %rsp, %rdi

; CHECK-NEXT:    callq capture

; CHECK-NEXT:    popq %rax

; CHECK-NEXT:    .cfi_def_cfa_offset 8

; CHECK-NEXT:    retq

  %a = alloca i64, align 64

  call void @capture(i64* %a)

  ret void

}