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

(At the moment, we ignore the alignment requirement.)

llvm-svn: 366393
This commit is contained in:
Philip Reames 2019-07-18 00:26:03 +00:00
parent 0c6ad3d5d1
commit 9cdd2152b9
1 changed files with 55 additions and 0 deletions
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55
llvm/test/CodeGen/X86/alloca-overaligned.ll Normal file
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; 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
}