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Avoids DCE on write_register

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209222 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Renato Golin
2014-05-20 17:40:03 +00:00
parent c9b12d06ef
commit 5d7afdb2ec
2 changed files with 4 additions and 1 deletions
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3
test/CodeGen/X86/stackpointer.ll
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@@ -1,11 +1,13 @@
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-linux-gnueabi | FileCheck %s
; RUN: opt < %s -O3 -S -mtriple=x86_64-linux-gnueabi | FileCheck %s --check-prefix=OPT
define i64 @get_stack() nounwind {
entry:
; CHECK-LABEL: get_stack:
; CHECK: movq %rsp, %rax
%sp = call i64 @llvm.read_register.i64(metadata !0)
; OPT: @llvm.read_register.i64
ret i64 %sp
}
@@ -14,6 +16,7 @@ entry:
; CHECK-LABEL: set_stack:
; CHECK: movq %rdi, %rsp
call void @llvm.write_register.i64(metadata !0, i64 %val)
; OPT: @llvm.write_register.i64
ret void
}