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SUCCESS! Sorry, I had removed the addFnAttr() call by accident. Using the basicAA pass and ReadOnly, as you suggested, works like a charm! :) > -----Original Message----- > From: Rob Pieke > Sent: Monday, November 15, 2010 4:40 PM > To: 'Duncan Sands' > Cc: 'llvmdev at cs.uiuc.edu'; 'Dan Gohman' > Subject: RE: [LLVMdev] Optimization of calls to functions without side > effects (from Kaleidoscope example) > > Still no luck after switching...

I'm using the gvn pass, not sure about basic-aa. I've copied the code as-is from http://llvm.org/docs/tutorial/LangImpl4.html#code and added "F->addFnAttr( Attribute::ReadOnly )" after "Function *F = Function::Create(FT, Function::ExternalLinkage, Name, TheModule)". The passes it sets up are: // Set up the optimizer pipeline. Start with registering info about

On Nov 15, 2010, at 8:42 AM, Rob Pieke wrote: > SUCCESS! > > Sorry, I had removed the addFnAttr() call by accident. Using the basicAA pass and ReadOnly, as you suggested, works like a charm! > > :) Thanks. I've updated the documentation and examples in r119169. I didn't update the OCaml documentation or examp...

...) ); Based on output from "llvm-ld -version" and "clang -v" I'm using: llvm version 2.9svn clang version 2.9 (trunk 118171) > -----Original Message----- > From: Duncan Sands [mailto:baldrick at free.fr] > Sent: Monday, November 15, 2010 4:32 PM > To: Rob Pieke > Cc: llvmdev at cs.uiuc.edu; Dan Gohman > Subject: Re: [LLVMdev] Optimization of calls to functions without side > effects (from Kaleidoscope example) > > Hi Rob, > > > I'm using the gvn pass, not sure about basic-aa. > > if you are using LLVM from svn then you...

Rob, I can reproduce the behaviour you observe using llvm top-of-tree. I will try to look into it. Best regards, -- Arnaud de Grandmaison -----Original Message----- From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Rob Pieke Sent: Monday, November 15, 2010 4:27 PM To: Duncan Sands; llvmdev at cs.uiuc.edu Subject: Re: [LLVMdev] Optimization of calls to functions without side effects (from Kaleidoscope example) I'm using the gvn pass, not sure about basic-aa. I've copied the code as-is from http://llvm.org/docs...

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Hi Rob, You need to set attribute ReadOnly on the sin / cos functions, using Function::addFnAttr(Attribute) for example. Best regards, -- Arnaud de Grandmaison -----Original Message----- From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Rob Pieke Sent: Monday, November 15, 2010 11:41 AM To: llvmdev at cs.uiuc.edu Subject: [LLVMdev] Optimization of calls to functions without side effects (from Kaleidoscope example) In http://llvm.org/docs/tutorial/LangImpl4.html#jit there's an example that optimizes calls to functions without side effec...

In http://llvm.org/docs/tutorial/LangImpl4.html#jit there's an example that optimizes calls to functions without side effects. Specifically, ready> extern sin(x); ready> extern cos(x); ready> def foo(x) sin(x)*sin(x) + cos(x)*cos(x); Read function definition: define double @foo(double %x) { entry: %calltmp = call double @sin(double %x) %multmp = fmul double %calltmp,

...should be sufficient. This patch updates both the source code & documentation. Best regards, -- Arnaud de Grandmaison -----Original Message----- From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On Behalf Of Dan Gohman Sent: Monday, November 15, 2010 7:45 PM To: Rob Pieke Cc: llvmdev at cs.uiuc.edu Subject: Re: [LLVMdev] Optimization of calls to functions without side effects (from Kaleidoscope example) On Nov 15, 2010, at 8:42 AM, Rob Pieke wrote: > SUCCESS! > > Sorry, I had removed the addFnAttr() call by accident. Using the basicAA pass and ReadOnly,...

Hi Rob, > I'm using the gvn pass, not sure about basic-aa. if you are using LLVM from svn then you need to specify the basic-aa analysis, otherwise gvn won't unify calls to readonly/readnone functions. This is new behaviour introduced by Dan; probably the tutorial should be updated. Ciao, Duncan. > > I've copied the code as-is from

Chris Lattner <clattner at apple.com> writes: > On Nov 5, 2010, at 7:11 AM, Kirk Kelsey wrote: > >> I'm wondering what the longer term plans are for the C Backend. I >> understand it's not actively developed, even deprecated. What I'm not >> clear about is whether it's something that is viewed as non-vital and >> should just as well go away, or

> You need to set attribute ReadOnly on the sin / cos functions, using > Function::addFnAttr(Attribute) for example. Hmm ... I tried setting that right after Function::Create but I still get the same result (though flagged with "readonly") declare double @sin(double) readonly declare double @cos(double) readonly define double @foo(double %x) readonly { entry: %calltmp = call