1 ; RUN: llc -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s 2 3 ; Ensure that red zone usage occurs. 4 define signext i8 @testStackProbesOff() { 5 %array = alloca [40096 x i8], align 16 6 ret i8 0 7 8 ; CHECK-LABEL: testStackProbesOff: 9 ; CHECK: subq $39976, %rsp # imm = 0x9C28 10 } 11 12 ; Ensure stack probes do not result in red zone usage. 13 define void @testStackProbesOn() "probe-stack"="__probestack" { 14 %array = alloca [40096 x i8], align 16 15 ret void 16 17 ; CHECK-LABEL: testStackProbesOn: 18 ; CHECK: movl $40104, %eax # imm = 0x9CA8 19 ; CHECK-NEXT: callq __probestack 20 ; CHECK-NEXT: subq %rax, %rsp 21 } 22
