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Drop @llvm.annotation and @llvm.ptr.annotation intrinsics during codegen. 

The intrinsic calls are dropped, but the annotated value is propagated.

Fixes PR 15253

Original patch by Zeng Bin!

llvm-svn: 182387
This commit is contained in:
Justin Holewinski 2013-05-21 14:37:16 +00:00
parent a8048b8216
commit fff1f5f5e2
4 changed files with 44 additions and 0 deletions
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6
llvm/lib/CodeGen/IntrinsicLowering.cpp
View File

@ -453,6 +453,12 @@ void IntrinsicLowering::LowerIntrinsicCall(CallInst *CI) {
CI->replaceAllUsesWith(ConstantInt::get(CI->getType(), 1));
break;
case Intrinsic::annotation:
case Intrinsic::ptr_annotation:
// Just drop the annotation, but forward the value
CI->replaceAllUsesWith(CI->getOperand(0));
break;
case Intrinsic::var_annotation:
break; // Strip out annotate intrinsic

5
llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
View File

@ -5037,6 +5037,11 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
setValue(&I, Res);
return 0;
}
case Intrinsic::annotation:
case Intrinsic::ptr_annotation:
// Drop the intrinsic, but forward the value
setValue(&I, getValue(I.getOperand(0)));
return 0;
case Intrinsic::var_annotation:
// Discard annotate attributes
return 0;

15
llvm/test/CodeGen/Generic/annotate.ll Normal file
View File

@ -0,0 +1,15 @@
; RUN: llc < %s
; PR15253
@.str = private unnamed_addr constant [4 x i8] c"sth\00", section "llvm.metadata"
@.str1 = private unnamed_addr constant [4 x i8] c"t.c\00", section "llvm.metadata"
define i32 @foo(i32 %a) {
entry:
%0 = call i32 @llvm.annotation.i32(i32 %a, i8* getelementptr inbounds ([4 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([4 x i8]* @.str1, i32 0, i32 0), i32 2)
ret i32 %0
}
declare i32 @llvm.annotation.i32(i32, i8*, i8*, i32) #1

18
llvm/test/CodeGen/Generic/ptr-annotate.ll Normal file
View File

@ -0,0 +1,18 @@
; RUN: llc < %s
; PR15253
%struct.mystruct = type { i32 }
@.str = private unnamed_addr constant [4 x i8] c"sth\00", section "llvm.metadata"
@.str1 = private unnamed_addr constant [4 x i8] c"t.c\00", section "llvm.metadata"
define void @foo() {
entry:
%m = alloca i8, align 4
%0 = call i8* @llvm.ptr.annotation.p0i8(i8* %m, i8* getelementptr inbounds ([4 x i8]* @.str, i32 0, i32 0), i8* getelementptr inbounds ([4 x i8]* @.str1, i32 0, i32 0), i32 2)
store i8 1, i8* %0, align 4
ret void
}
declare i8* @llvm.ptr.annotation.p0i8(i8*, i8*, i8*, i32) #1