llvm dev - Apr 2010 - [LLVMdev] SCEVTargetDataType

All,

I had 2 questions for the group.

1. In llvm-2.6 I am able to identify sizeof(i8) as a SCEVTargetDataType but
how can we recover that the size is actually 8.

2. I dont see it in the present doxygen. Has it been discontinued in llvm
2.7 ?



Regards


Aparna Kotha
Graduate Student
University of Maryland , College Park
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On Apr 17, 2010, at 8:42 PM, aparna kotha wrote:
> All,
>
> I had 2 questions for the group.
>
> 1. In llvm-2.6 I am able to identify sizeof(i8) as a  
> SCEVTargetDataType but how can we recover that the size is actually 8.
You need to make TargetData available.  The special "sizeof" and  
"offsetof" expressions
are used to analyze code in a target-independent manner, when the  
memory layouts for
types are not known.  With TargetData information, ScalarEvolution  
will just use integer
constants instead of these special expressions.
> 2. I dont see it in the present doxygen. Has it been discontinued in  
> llvm 2.7 ?
Yes.  They have been replaced with expressions which compute the same  
values,
using lower-level constructs.  It's still the case that  
ScalarEvolution will use integer
constants if TargetData information is available.

Dan