diff options
| author | whitequark <whitequark@whitequark.org> | 2017-06-22 15:42:53 +0000 |
|---|---|---|
| committer | whitequark <whitequark@whitequark.org> | 2017-06-22 15:42:53 +0000 |
| commit | cebe8241cac063c43784104114abe06b17c76673 (patch) | |
| tree | d55e84a52a0c72acdfd814f2c0e748e07e8f8027 /llvm/test/CodeGen/X86/stack-probe-red-zone.ll | |
| parent | 5991b5be745bfdd86e2d568a1516e910d4713bdc (diff) | |
| download | bcm5719-llvm-cebe8241cac063c43784104114abe06b17c76673.tar.gz bcm5719-llvm-cebe8241cac063c43784104114abe06b17c76673.zip | |
[X86] Add support for "probe-stack" attribute
This commit adds prologue code emission for stack probe function
calls.
Reviewed By: majnemer
Differential Revision: https://reviews.llvm.org/D34387
llvm-svn: 306010
Diffstat (limited to 'llvm/test/CodeGen/X86/stack-probe-red-zone.ll')
| -rw-r--r-- | llvm/test/CodeGen/X86/stack-probe-red-zone.ll | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/X86/stack-probe-red-zone.ll b/llvm/test/CodeGen/X86/stack-probe-red-zone.ll new file mode 100644 index 00000000000..f0691980989 --- /dev/null +++ b/llvm/test/CodeGen/X86/stack-probe-red-zone.ll @@ -0,0 +1,21 @@ +; RUN: llc -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s + +; Ensure that red zone usage occurs. +define void @testStackProbesOff() { + %array = alloca [40096 x i8], align 16 + ret void + +; CHECK-LABEL: testStackProbesOff: +; CHECK: subq $39976, %rsp # imm = 0x9C28 +} + +; Ensure stack probes do not result in red zone usage. +define void @testStackProbesOn() "probe-stack"="__probestack" { + %array = alloca [40096 x i8], align 16 + ret void + +; CHECK-LABEL: testStackProbesOn: +; CHECK: movl $40104, %eax # imm = 0x9CA8 +; CHECK-NEXT: callq __probestack +; CHECK-NEXT: subq %rax, %rsp +} |
