stack-clash-small-large-align.ll
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; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define i32 @foo_noprotect() local_unnamed_addr {
; CHECK-LABEL: foo_noprotect:
; 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 $-65536, %rsp
; CHECK-NEXT: subq $65536, %rsp
; CHECK-NEXT: movl $1, 392(%rsp)
; CHECK-NEXT: movl (%rsp), %eax
; CHECK-NEXT: movq %rbp, %rsp
; CHECK-NEXT: popq %rbp
; CHECK-NEXT: .cfi_def_cfa %rsp, 8
; CHECK-NEXT: retq
%a = alloca i32, i64 100, align 65536
%b = getelementptr inbounds i32, i32* %a, i64 98
store volatile i32 1, i32* %b
%c = load volatile i32, i32* %a
ret i32 %c
}
define i32 @foo_protect() local_unnamed_addr #0 {
; CHECK-LABEL: foo_protect:
; 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: movq %rsp, %r11
; CHECK-NEXT: andq $-65536, %r11 # imm = 0xFFFF0000
; CHECK-NEXT: cmpq %rsp, %r11
; CHECK-NEXT: je .LBB1_4
; CHECK-NEXT:# %bb.1:
; CHECK-NEXT: subq $4096, %rsp # imm = 0x1000
; CHECK-NEXT: cmpq %rsp, %r11
; CHECK-NEXT: jb .LBB1_3
; CHECK-NEXT:.LBB1_2: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: movq $0, (%rsp)
; CHECK-NEXT: subq $4096, %rsp # imm = 0x1000
; CHECK-NEXT: cmpq %rsp, %r11
; CHECK-NEXT: jb .LBB1_2
; CHECK-NEXT:.LBB1_3:
; CHECK-NEXT: movq %r11, %rsp
; CHECK-NEXT: movq $0, (%rsp)
; CHECK-NEXT:.LBB1_4:
; CHECK-NEXT: movq %rsp, %r11
; CHECK-NEXT: subq $65536, %r11 # imm = 0x10000
; CHECK-NEXT:.LBB1_5: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: subq $4096, %rsp # imm = 0x1000
; CHECK-NEXT: movq $0, (%rsp)
; CHECK-NEXT: cmpq %r11, %rsp
; CHECK-NEXT: jne .LBB1_5
; CHECK-NEXT:# %bb.6:
; CHECK-NEXT: movl $1, 392(%rsp)
; CHECK-NEXT: movl (%rsp), %eax
; CHECK-NEXT: movq %rbp, %rsp
; CHECK-NEXT: popq %rbp
; CHECK-NEXT: .cfi_def_cfa %rsp, 8
; CHECK-NEXT: retq
%a = alloca i32, i64 100, align 65536
%b = getelementptr inbounds i32, i32* %a, i64 98
store volatile i32 1, i32* %b
%c = load volatile i32, i32* %a
ret i32 %c
}
attributes #0 = {"probe-stack"="inline-asm"}