[llvm-commits] [llvm] r66244 - in /llvm/trunk: lib/Transforms/Scalar/GVN.cpp test/Transforms/GVN/2009-03-05-dbg.ll

[Owen Anderson]

You may need to make a similar change to memdep, to prevent debug  
instrinsics from blocking load elimination.

--Owen

On Mar 5, 2009, at 6:59 PM, Devang Patel wrote:

> Author: dpatel
> Date: Thu Mar  5 20:59:27 2009
> New Revision: 66244
>
> URL: http://llvm.org/viewvc/llvm-project?rev=66244&view=rev
> Log:
> Skip DbgInfoIntrinsic.
>
> Added:
>    llvm/trunk/test/Transforms/GVN/2009-03-05-dbg.ll
> Modified:
>    llvm/trunk/lib/Transforms/Scalar/GVN.cpp
>
> Modified: llvm/trunk/lib/Transforms/Scalar/GVN.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/GVN.cpp?rev=66244&r1=66243&r2=66244&view=diff
>
> = 
> = 
> = 
> = 
> = 
> = 
> = 
> = 
> ======================================================================
> --- llvm/trunk/lib/Transforms/Scalar/GVN.cpp (original)
> +++ llvm/trunk/lib/Transforms/Scalar/GVN.cpp Thu Mar  5 20:59:27 2009
> @@ -21,7 +21,7 @@
> #include "llvm/Constants.h"
> #include "llvm/DerivedTypes.h"
> #include "llvm/Function.h"
> -#include "llvm/Instructions.h"
> +#include "llvm/IntrinsicInst.h"
> #include "llvm/Value.h"
> #include "llvm/ADT/DenseMap.h"
> #include "llvm/ADT/DepthFirstIterator.h"
> @@ -1470,7 +1470,7 @@
>
>       if (isa<AllocationInst>(CurInst) ||  
> isa<TerminatorInst>(CurInst) ||
>           isa<PHINode>(CurInst) || CurInst->mayReadFromMemory() ||
> -          CurInst->mayWriteToMemory())
> +          CurInst->mayWriteToMemory() ||  
> isa<DbgInfoIntrinsic>(CurInst))
>         continue;
>
>       uint32_t valno = VN.lookup(CurInst);
>
> Added: llvm/trunk/test/Transforms/GVN/2009-03-05-dbg.ll
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/GVN/2009-03-05-dbg.ll?rev=66244&view=auto
>
> = 
> = 
> = 
> = 
> = 
> = 
> = 
> = 
> ======================================================================
> --- llvm/trunk/test/Transforms/GVN/2009-03-05-dbg.ll (added)
> +++ llvm/trunk/test/Transforms/GVN/2009-03-05-dbg.ll Thu Mar  5  
> 20:59:27 2009
> @@ -0,0 +1,66 @@
> +; RUN: llvm-as < %s | opt -gvn -disable-output
> +	%llvm.dbg.compile_unit.type = type { i32, { }*, i32, i8*, i8*,  
> i8*, i1, i1, i8*, i32 }
> + at llvm.dbg.compile_unit298 = external constant  
> %llvm.dbg.compile_unit.type		; <%llvm.dbg.compile_unit.type*>  
> [#uses=1]
> +
> +declare void @llvm.dbg.stoppoint(i32, i32, { }*) nounwind
> +
> +define i8* @__deregister_frame_info_bases(i8* %begin) {
> +entry:
> +	br i1 false, label %bb17, label %bb
> +
> +bb:		; preds = %entry
> +	br i1 false, label %bb17, label %bb6.preheader
> +
> +bb6.preheader:		; preds = %bb
> +	br label %bb6
> +
> +bb3:		; preds = %bb6
> +	br i1 false, label %bb4, label %bb6
> +
> +bb4:		; preds = %bb3
> +	br label %out
> +
> +bb6:		; preds = %bb3, %bb6.preheader
> +	br i1 false, label %bb14.loopexit, label %bb3
> +
> +bb8:		; preds = %bb14
> +	br i1 false, label %bb9, label %bb11
> +
> +bb9:		; preds = %bb8
> +	br i1 false, label %bb10, label %bb13
> +
> +bb10:		; preds = %bb9
> +	br label %out
> +
> +bb11:		; preds = %bb8
> +	br i1 false, label %bb12, label %bb13
> +
> +bb12:		; preds = %bb11
> +	br label %out
> +
> +bb13:		; preds = %bb11, %bb9
> +	br label %bb14
> +
> +bb14.loopexit:		; preds = %bb6
> +	br label %bb14
> +
> +bb14:		; preds = %bb14.loopexit, %bb13
> +	br i1 false, label %bb15.loopexit, label %bb8
> +
> +out:		; preds = %bb12, %bb10, %bb4
> +	tail call void @llvm.dbg.stoppoint(i32 217, i32 0, { }* bitcast  
> (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit298 to { }*))
> +	br i1 false, label %bb15, label %bb16
> +
> +bb15.loopexit:		; preds = %bb14
> +	br label %bb15
> +
> +bb15:		; preds = %bb15.loopexit, %out
> +	tail call void @llvm.dbg.stoppoint(i32 217, i32 0, { }* bitcast  
> (%llvm.dbg.compile_unit.type* @llvm.dbg.compile_unit298 to { }*))
> +	unreachable
> +
> +bb16:		; preds = %out
> +	ret i8* null
> +
> +bb17:		; preds = %bb, %entry
> +	ret i8* null
> +}
>
>
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