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[Statepoints] Add a test which shows a miscompile with no-realign-stacks

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llvm-svn: 366760
This commit is contained in:
Philip Reames 2019-07-22 23:08:56 +00:00
parent c1c1ca6b8c
commit 901e1360c3
1 changed files with 55 additions and 0 deletions
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test/CodeGen/X86/statepoint-no-realign-stack.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -verify-machineinstrs -mcpu=skylake < %s | FileCheck %s
target datalayout = "e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-linux-gnu"
; Shows a case where we spill a 32 byte value onto a stack which is only
; 16 byte aligned. With stack realignment, we can use an aligned spill slot
; (if we think it's profitable), but without realignment, using a stack
; slot which is 32 byte aligned or a store which expects 32 byte alignment
; is incorrect.
declare void @foo()
define void @can_realign(<8 x i32>* %p) {
; CHECK-LABEL: can_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 $-32, %rsp
; CHECK-NEXT: subq $64, %rsp
; CHECK-NEXT: vmovaps (%rdi), %ymm0
; CHECK-NEXT: vmovaps %ymm0, (%rsp)
; CHECK-NEXT: vzeroupper
; CHECK-NEXT: callq foo
; CHECK-NEXT: .Ltmp0:
; CHECK-NEXT: movq %rbp, %rsp
; CHECK-NEXT: popq %rbp
; CHECK-NEXT: .cfi_def_cfa %rsp, 8
; CHECK-NEXT: retq
%val = load <8 x i32>, <8 x i32>* %p, align 32
call void @foo() ["deopt" (<8 x i32> %val)]
ret void
}
; TODO: currently shows incorrect codegen, FIXME
define void @no_realign(<8 x i32>* %p) "no-realign-stack" {
; CHECK-LABEL: no_realign:
; CHECK: # %bb.0:
; CHECK-NEXT: subq $40, %rsp
; CHECK-NEXT: .cfi_def_cfa_offset 48
; CHECK-NEXT: vmovaps (%rdi), %ymm0
; CHECK-NEXT: vmovaps %ymm0, (%rsp)
; CHECK-NEXT: vzeroupper
; CHECK-NEXT: callq foo
; CHECK-NEXT: .Ltmp1:
; CHECK-NEXT: addq $40, %rsp
; CHECK-NEXT: .cfi_def_cfa_offset 8
; CHECK-NEXT: retq
%val = load <8 x i32>, <8 x i32>* %p, align 32
call void @foo() ["deopt" (<8 x i32> %val)]
ret void
}