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Invariant start/end intrinsics overloaded for address space

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Summary:
The llvm.invariant.start and llvm.invariant.end intrinsics currently
support specifying invariant memory objects only in the default address
space.

With this change, these intrinsics are overloaded for any adddress space
for memory objects
and we can use these llvm invariant intrinsics in non-default address
spaces.

Example: llvm.invariant.start.p1i8(i64 4, i8 addrspace(1)* %ptr)

This overloaded intrinsic is needed for representing final or invariant
memory in managed languages.

Reviewers: apilipenko, reames

Subscribers: llvm-commits
llvm-svn: 276447
This commit is contained in:
Anna Thomas 2016-07-22 17:49:40 +00:00
parent 5af4b0792f
commit 6f5ce86e80
9 changed files with 78 additions and 23 deletions
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6
docs/LangRef.rst
View File

@ -11842,10 +11842,11 @@ object following this intrinsic may be removed as dead.
Syntax:
"""""""
This is an overloaded intrinsic. The memory object can belong to any address space.
::
declare {}* @llvm.invariant.start(i64 <size>, i8* nocapture <ptr>)
declare {}* @llvm.invariant.start.p0i8(i64 <size>, i8* nocapture <ptr>)
Overview:
"""""""""
@ -11872,10 +11873,11 @@ unchanging.
Syntax:
"""""""
This is an overloaded intrinsic. The memory object can belong to any address space.
::
declare void @llvm.invariant.end({}* <start>, i64 <size>, i8* nocapture <ptr>)
declare void @llvm.invariant.end.p0i8({}* <start>, i64 <size>, i8* nocapture <ptr>)
Overview:
"""""""""

4
include/llvm/IR/Intrinsics.td
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@ -554,11 +554,11 @@ def int_lifetime_end : Intrinsic<[],
[llvm_i64_ty, llvm_ptr_ty],
[IntrArgMemOnly, NoCapture<1>]>;
def int_invariant_start : Intrinsic<[llvm_descriptor_ty],
[llvm_i64_ty, llvm_ptr_ty],
[llvm_i64_ty, llvm_anyptr_ty],
[IntrArgMemOnly, NoCapture<1>]>;
def int_invariant_end : Intrinsic<[],
[llvm_descriptor_ty, llvm_i64_ty,
llvm_ptr_ty],
llvm_anyptr_ty],
[IntrArgMemOnly, NoCapture<2>]>;
def int_invariant_group_barrier : Intrinsic<[llvm_ptr_ty],

28
lib/IR/AutoUpgrade.cpp
View File

@ -148,7 +148,31 @@ static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
}
break;
}
case 'i': {
if (Name.startswith("invariant.start")) {
auto Args = F->getFunctionType()->params();
Type* ObjectPtr[1] = {Args[1]};
if (F->getName() !=
Intrinsic::getName(Intrinsic::invariant_start, ObjectPtr)) {
F->setName(Name + ".old");
NewFn = Intrinsic::getDeclaration(
F->getParent(), Intrinsic::invariant_start, ObjectPtr);
return true;
}
}
if (Name.startswith("invariant.end")) {
auto Args = F->getFunctionType()->params();
Type* ObjectPtr[1] = {Args[2]};
if (F->getName() !=
Intrinsic::getName(Intrinsic::invariant_end, ObjectPtr)) {
F->setName(Name + ".old");
NewFn = Intrinsic::getDeclaration(F->getParent(),
Intrinsic::invariant_end, ObjectPtr);
return true;
}
}
break;
}
case 'm': {
if (Name.startswith("masked.load.")) {
Type *Tys[] = { F->getReturnType(), F->arg_begin()->getType() };
@ -1339,6 +1363,8 @@ void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
return;
}
case Intrinsic::invariant_start:
case Intrinsic::invariant_end:
case Intrinsic::masked_load:
case Intrinsic::masked_store: {
SmallVector<Value *, 4> Args(CI->arg_operands().begin(),

15
test/Assembler/auto_upgrade_intrinsics.ll
View File

@ -76,6 +76,21 @@ define void @tests.masked.store(<2 x double>* %ptr, <2 x i1> %mask, <2 x double>
ret void
}
declare {}* @llvm.invariant.start(i64, i8* nocapture) nounwind readonly
declare void @llvm.invariant.end({}*, i64, i8* nocapture) nounwind
define void @tests.invariant.start.end() {
; CHECK-LABEL: @tests.invariant.start.end(
%a = alloca i8
%i = call {}* @llvm.invariant.start(i64 1, i8* %a)
; CHECK: call {}* @llvm.invariant.start.p0i8
store i8 0, i8* %a
call void @llvm.invariant.end({}* %i, i64 1, i8* %a)
; CHECK: call void @llvm.invariant.end.p0i8
ret void
}
@__stack_chk_guard = external global i8*
declare void @llvm.stackprotectorcheck(i8**)

8
test/CodeGen/AMDGPU/promote-alloca-invariant-markers.ll
View File

@ -1,7 +1,7 @@
; RUN: llc -march=amdgcn -mattr=+promote-alloca -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
declare {}* @llvm.invariant.start(i64, i8* nocapture) #0
declare void @llvm.invariant.end({}*, i64, i8* nocapture) #0
declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) #0
declare void @llvm.invariant.end.p0i8({}*, i64, i8* nocapture) #0
declare i8* @llvm.invariant.group.barrier(i8*) #1
; GCN-LABEL: {{^}}use_invariant_promotable_lds:
@ -14,8 +14,8 @@ bb:
%tmp2 = getelementptr inbounds i32, i32 addrspace(1)* %arg, i64 1
%tmp3 = load i32, i32 addrspace(1)* %tmp2
store i32 %tmp3, i32* %tmp
%tmp4 = call {}* @llvm.invariant.start(i64 4, i8* %tmp1) #0
call void @llvm.invariant.end({}* %tmp4, i64 4, i8* %tmp1) #0
%tmp4 = call {}* @llvm.invariant.start.p0i8(i64 4, i8* %tmp1) #0
call void @llvm.invariant.end.p0i8({}* %tmp4, i64 4, i8* %tmp1) #0
%tmp5 = call i8* @llvm.invariant.group.barrier(i8* %tmp1) #1
ret void
}

8
test/Feature/memorymarkers.ll
View File

@ -6,8 +6,8 @@ declare void @_Z3barRKi(i32*)
declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end(i64, i8* nocapture) nounwind
declare {}* @llvm.invariant.start(i64, i8* nocapture) readonly nounwind
declare void @llvm.invariant.end({}*, i64, i8* nocapture) nounwind
declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) readonly nounwind
declare void @llvm.invariant.end.p0i8({}*, i64, i8* nocapture) nounwind
define i32 @_Z4foo2v() nounwind {
entry:
@ -24,12 +24,12 @@ entry:
store i32 5, i32* %1, align 4
;; Constructor has finished here.
%inv = call {}* @llvm.invariant.start(i64 8, i8* %y)
%inv = call {}* @llvm.invariant.start.p0i8(i64 8, i8* %y)
call void @_Z3barRKi(i32* %0) nounwind
%2 = load i32, i32* %0, align 8
;; Destructor is run here.
call void @llvm.invariant.end({}* %inv, i64 8, i8* %y)
call void @llvm.invariant.end.p0i8({}* %inv, i64 8, i8* %y)
;; Destructor is done here.
call void @llvm.lifetime.end(i64 8, i8* %y)
ret i32 %2

4
test/Transforms/GlobalOpt/invariant-nodatalayout.ll
View File

@ -1,14 +1,14 @@
; RUN: opt -globalopt -S -o - < %s | FileCheck %s
; The check here is that it doesn't crash.
declare {}* @llvm.invariant.start(i64 %size, i8* nocapture %ptr)
declare {}* @llvm.invariant.start.p0i8(i64 %size, i8* nocapture %ptr)
@object1 = global { i32, i32 } zeroinitializer
; CHECK: @object1 = global { i32, i32 } zeroinitializer
define void @ctor1() {
%ptr = bitcast {i32, i32}* @object1 to i8*
call {}* @llvm.invariant.start(i64 4, i8* %ptr)
call {}* @llvm.invariant.start.p0i8(i64 4, i8* %ptr)
ret void
}

10
test/Transforms/GlobalOpt/invariant.ll
View File

@ -3,10 +3,10 @@
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare {}* @llvm.invariant.start(i64 %size, i8* nocapture %ptr)
declare {}* @llvm.invariant.start.p0i8(i64 %size, i8* nocapture %ptr)
define void @test1(i8* %ptr) {
call {}* @llvm.invariant.start(i64 4, i8* %ptr)
call {}* @llvm.invariant.start.p0i8(i64 4, i8* %ptr)
ret void
}
@ -25,7 +25,7 @@ define void @ctor1() {
define void @ctor2() {
store i32 -1, i32* @object2
%A = bitcast i32* @object2 to i8*
%B = call {}* @llvm.invariant.start(i64 4, i8* %A)
%B = call {}* @llvm.invariant.start.p0i8(i64 4, i8* %A)
%C = bitcast {}* %B to i8*
ret void
}
@ -36,7 +36,7 @@ define void @ctor2() {
define void @ctor3() {
store i32 -1, i32* @object3
%A = bitcast i32* @object3 to i8*
call {}* @llvm.invariant.start(i64 3, i8* %A)
call {}* @llvm.invariant.start.p0i8(i64 3, i8* %A)
ret void
}
@ -46,7 +46,7 @@ define void @ctor3() {
define void @ctor4() {
store i32 -1, i32* @object4
%A = bitcast i32* @object4 to i8*
call {}* @llvm.invariant.start(i64 -1, i8* %A)
call {}* @llvm.invariant.start.p0i8(i64 -1, i8* %A)
ret void
}

18
test/Transforms/InstCombine/invariant.ll
View File

@ -2,15 +2,27 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
declare void @g(i8*)
declare void @g_addr1(i8 addrspace(1)*)
declare {}* @llvm.invariant.start(i64, i8* nocapture) nounwind readonly
declare {}* @llvm.invariant.start.p0i8(i64, i8* nocapture) nounwind readonly
declare {}* @llvm.invariant.start.p1i8(i64, i8 addrspace(1)* nocapture) nounwind readonly
define i8 @f() {
%a = alloca i8 ; <i8*> [#uses=4]
store i8 0, i8* %a
%i = call {}* @llvm.invariant.start(i64 1, i8* %a) ; <{}*> [#uses=0]
; CHECK: call {}* @llvm.invariant.start
%i = call {}* @llvm.invariant.start.p0i8(i64 1, i8* %a) ; <{}*> [#uses=0]
; CHECK: call {}* @llvm.invariant.start.p0i8
call void @g(i8* %a)
%r = load i8, i8* %a ; <i8> [#uses=1]
ret i8 %r
}
; make sure llvm.invariant.call in non-default addrspace are also not eliminated.
define i8 @f_addrspace1(i8 addrspace(1)* %a) {
store i8 0, i8 addrspace(1)* %a
%i = call {}* @llvm.invariant.start.p1i8(i64 1, i8 addrspace(1)* %a) ; <{}*> [#uses=0]
; CHECK: call {}* @llvm.invariant.start.p1i8
call void @g_addr1(i8 addrspace(1)* %a)
%r = load i8, i8 addrspace(1)* %a ; <i8> [#uses=1]
ret i8 %r
}