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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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2
include/llvm/IR/Intrinsics.td
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@ -253,7 +253,7 @@ def int_frameaddress : Intrinsic<[llvm_ptr_ty], [llvm_i32_ty], [IntrNoMem]>;
def int_read_register : Intrinsic<[llvm_anyint_ty], [llvm_metadata_ty],
[IntrNoMem], "llvm.read_register">;
def int_write_register : Intrinsic<[], [llvm_metadata_ty, llvm_anyint_ty],
[IntrNoMem], "llvm.write_register">;
[], "llvm.write_register">;
// Note: we treat stacksave/stackrestore as writemem because we don't otherwise
// model their dependencies on allocas.

3
test/CodeGen/X86/stackpointer.ll
View File

@ -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
}