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Chuck Rose III

2007-Sep-05 21:21 UTC

[LLVMdev] Seeing a crash with ConstantFP::get

Hola LLVMers,

 

I'm getting a crash when using ConstantFP::get.

 

I can repro it by adding one line to the Fibonacci example program:

 

int main(int argc, char **argv) {

  int n = argc > 1 ? atol(argv[1]) : 24;

 

  // Create some module to put our function into it.

  Module *M = new Module("test");

 

  // We are about to create the "fib" function:

  Function *FibF = CreateFibFunction(M);

 

// add the following line

  Constant* C = ConstantFP::get(Type::FloatTy,0.0);

 

 

Can someone verify this?  This is on the PC side of my system which I
build with the VStudio files.  I don't know if the Mac side sees this as
well, but I'll try and verify.  Seems really odd to have something this
basic crash me.  It came up because the JITter will call ConstantFP::get
with the GenericValue arguments passed it, but the above repro is a lot
simpler and is independent of the JITter.

 

My call stack looks like this:

 

            in here it fails this:  assert(category == fcNormal ||
category == fcNaN);

            Fibonacci.exe!llvm::APFloat::significandParts()  Line 360 +
0x39 bytes    C++

            Fibonacci.exe!llvm::APFloat::zeroSignificand()  Line 387 +
0x15 bytes     C++

            Fibonacci.exe!llvm::APFloat::APFloat(const
llvm::fltSemantics & ourSemantics={...}, unsigned __int64 value=1)  Line
307       C++

            Fibonacci.exe!`anonymous
namespace'::DenseMapAPFloatKeyInfo::getEmptyKey()  Line 277 + 0x11 bytes
C++

            Fibonacci.exe!llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo>::getEmptyKey()  Line 236 + 0x9
bytes          C++

            Fibonacci.exe!llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo>::init(unsigned int
InitBuckets=64)  Line 295 + 0x9 bytes         C++

            Fibonacci.exe!llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo>::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo>(unsigned int NumInitBuckets=64)
Line 68      C++

            Fibonacci.exe!llvm::ManagedStatic<llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo> >::LazyInit()  Line 72 + 0x24
bytes     C++

            Fibonacci.exe!llvm::ManagedStatic<llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo> >::operator*()  Line 55  C++

            Fibonacci.exe!llvm::ConstantFP::get(const llvm::Type *
Ty=0x01b352d8, double V=0.00000000000000000)  Line 299 + 0xe bytes
C++

            Fibonacci.exe!main(int argc=1, char * * argv=0x01b35060)
Line 99 + 0x13 bytes  C++

            Fibonacci.exe!__tmainCRTStartup()  Line 586 + 0x19 bytes
C

            Fibonacci.exe!mainCRTStartup()  Line 403          C

 

Thanks,

Chuck.

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Dale Johannesen

2007-Sep-05 21:38 UTC

head link

[LLVMdev] Seeing a crash with ConstantFP::get

On Sep 5, 2007, at 2:21 PM, Chuck Rose III wrote:
> Hola LLVMers,
>
>
>
> I’m getting a crash when using ConstantFP::get.
>
>
>
> I can repro it by adding one line to the Fibonacci example program:
>
>
>
> int main(int argc, char **argv) {
>
>   int n = argc > 1 ? atol(argv[1]) : 24;
>
>
>
>   // Create some module to put our function into it.
>
>   Module *M = new Module("test");
>
>
>
>   // We are about to create the "fib" function:
>
>   Function *FibF = CreateFibFunction(M);
>
>
>
> // add the following line
>
>   Constant* C = ConstantFP::get(Type::FloatTy,0.0);
>
>
>
>
>
> Can someone verify this?  This is on the PC side of my system which  
> I build with the VStudio files.  I don’t know if the Mac side sees  
> this as well, but I’ll try and verify.  Seems really odd to have  
> something this basic crash me.  It came up because the JITter will  
> call ConstantFP::get with the GenericValue arguments passed it, but  
> the above repro is a lot simpler and is independent of the JITter.
>
>
>
> My call stack looks like this:
>
>
>
>             in here it fails this:  assert(category == fcNormal ||  
> category == fcNaN);
>
>             Fibonacci.exe!llvm::APFloat::significandParts()  Line  
> 360 + 0x39 bytes    C++
>
>             Fibonacci.exe!llvm::APFloat::zeroSignificand()  Line  
> 387 + 0x15 bytes     C++I've been working in this area and probably introduced this, but I  
don't see how:  zeroSignificand() sets 'category' to fcNormal before
calling significandParts, so I don't see how that assert could be  
triggered.   The call stack looks normal for that source line.  It  
doesn't appear on the Mac.   Could your compiler be misoptimizing the  
code?>             Fibonacci.exe!llvm::APFloat::APFloat(const  
> llvm::fltSemantics & ourSemantics={...}, unsigned __int64 value=1)   
> Line 307       C++
>
>             Fibonacci.exe!`anonymous  
> namespace'::DenseMapAPFloatKeyInfo::getEmptyKey()  Line 277 + 0x11  
> bytes         C++
>
>             Fibonacci.exe!llvm::DenseMap<`anonymous  
> namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP  
> *,A0x5b1fa632::DenseMapAPFloatKeyInfo>::getEmptyKey()  Line 236 +  
> 0x9 bytes          C++
>
>             Fibonacci.exe!llvm::DenseMap<`anonymous  
> namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP  
> *,A0x5b1fa632::DenseMapAPFloatKeyInfo>::init(unsigned int  
> InitBuckets=64)  Line 295 + 0x9 bytes         C++
>
>             Fibonacci.exe!llvm::DenseMap<`anonymous  
> namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP  
> *,A0x5b1fa632::DenseMapAPFloatKeyInfo>::DenseMap<`anonymous  
> namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP  
> *,A0x5b1fa632::DenseMapAPFloatKeyInfo>(unsigned int  
> NumInitBuckets=64)  Line 68      C++
>
>             Fibonacci.exe! 
> llvm::ManagedStatic<llvm::DenseMap<`anonymous  
> namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP  
> *,A0x5b1fa632::DenseMapAPFloatKeyInfo> >::LazyInit()  Line 72 +  
> 0x24 bytes     C++
>
>             Fibonacci.exe! 
> llvm::ManagedStatic<llvm::DenseMap<`anonymous  
> namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP  
> *,A0x5b1fa632::DenseMapAPFloatKeyInfo> >::operator*()  Line 55  C++
>
>             Fibonacci.exe!llvm::ConstantFP::get(const llvm::Type *  
> Ty=0x01b352d8, double V=0.00000000000000000)  Line 299 + 0xe  
> bytes          C++
>
>             Fibonacci.exe!main(int argc=1, char * *  
> argv=0x01b35060)  Line 99 + 0x13 bytes  C++
>
>             Fibonacci.exe!__tmainCRTStartup()  Line 586 + 0x19  
> bytes         C
>
>             Fibonacci.exe!mainCRTStartup()  Line 403          C
>
>
>
> Thanks,
>
> Chuck.
>
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
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Chuck Rose III

2007-Sep-05 21:50 UTC

head link

[LLVMdev] Seeing a crash with ConstantFP::get

It's in debug.  I'm having a look at the assembler it's producing
right
now and it's definitely a little odd for what should be a simple
assignment in zeroSignificand. 

 

________________________________

From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu]
On Behalf Of Dale Johannesen
Sent: Wednesday, September 05, 2007 2:39 PM
To: LLVM Developers Mailing List
Subject: Re: [LLVMdev] Seeing a crash with ConstantFP::get

 

 

On Sep 5, 2007, at 2:21 PM, Chuck Rose III wrote:





Hola LLVMers,

 

I'm getting a crash when using ConstantFP::get.

 

I can repro it by adding one line to the Fibonacci example program:

 

int main(int argc, char **argv) {

  int n = argc > 1 ? atol(argv[1]) : 24;

 

  // Create some module to put our function into it.

  Module *M = new Module("test");

 

  // We are about to create the "fib" function:

  Function *FibF = CreateFibFunction(M);

 

// add the following line

  Constant* C = ConstantFP::get(Type::FloatTy,0.0);

 

 

Can someone verify this?  This is on the PC side of my system which I
build with the VStudio files.  I don't know if the Mac side sees this as
well, but I'll try and verify.  Seems really odd to have something this
basic crash me.  It came up because the JITter will call ConstantFP::get
with the GenericValue arguments passed it, but the above repro is a lot
simpler and is independent of the JITter.

 

My call stack looks like this:

 

            in here it fails this:  assert(category == fcNormal ||
category == fcNaN);

            Fibonacci.exe!llvm::APFloat::significandParts()  Line 360 +
0x39 bytes    C++

            Fibonacci.exe!llvm::APFloat::zeroSignificand()  Line 387 +
0x15 bytes     C++

I've been working in this area and probably introduced this, but I don't
see how:  zeroSignificand() sets 'category' to fcNormal before calling
significandParts, so I don't see how that assert could be triggered.
The call stack looks normal for that source line.  It doesn't appear on
the Mac.   Could your compiler be misoptimizing the code?

	            Fibonacci.exe!llvm::APFloat::APFloat(const
llvm::fltSemantics & ourSemantics={...}, unsigned __int64 value=1)  Line
307       C++

	            Fibonacci.exe!`anonymous
namespace'::DenseMapAPFloatKeyInfo::getEmptyKey()  Line 277 + 0x11 bytes
C++

	            Fibonacci.exe!llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo>::getEmptyKey()  Line 236 + 0x9
bytes          C++

	            Fibonacci.exe!llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo>::init(unsigned int
InitBuckets=64)  Line 295 + 0x9 bytes         C++

	            Fibonacci.exe!llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo>::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo>(unsigned int NumInitBuckets=64)
Line 68      C++

	
Fibonacci.exe!llvm::ManagedStatic<llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo> >::LazyInit()  Line 72 + 0x24
bytes     C++

	
Fibonacci.exe!llvm::ManagedStatic<llvm::DenseMap<`anonymous
namespace'::DenseMapAPFloatKeyInfo::KeyTy,llvm::ConstantFP
*,A0x5b1fa632::DenseMapAPFloatKeyInfo> >::operator*()  Line 55  C++

	            Fibonacci.exe!llvm::ConstantFP::get(const llvm::Type
* Ty=0x01b352d8, double V=0.00000000000000000)  Line 299 + 0xe bytes
C++

	            Fibonacci.exe!main(int argc=1, char * *
argv=0x01b35060)  Line 99 + 0x13 bytes  C++

	            Fibonacci.exe!__tmainCRTStartup()  Line 586 + 0x19
bytes         C

	            Fibonacci.exe!mainCRTStartup()  Line 403          C

	 

	Thanks,

	Chuck.

	_______________________________________________

	LLVM Developers mailing list

	LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu

	http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

 

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