[LLVMdev] [RFC] Extend LLVM IR to express "fast-math" at a per-instruction level

Joe Abbey jabbey at arxan.com
Wed Nov 14 17:04:00 PST 2012

On Nov 14, 2012, at 5:13 PM, Michael Ilseman <milseman at apple.com> wrote:

> I attached a working patch of changes to the bitcode reader and writer. This patch references other local changes I have to other parts of the code (e.g. "FastMathFlags"), but shows the general idea I'm going for. When I've ironed out all the bugs, I'll attach a series of patches for all the other content.
> <bitcode_example.patch>
> Does this patch make sense, or am I still missing the main concern?


Ah I see.  So this just becomes a matter of interpretation of bits in the optimization flags.  Shouldn't need to promote the CurVersion.

Nitpick: 80-cols in BitcodeReader.cpp

Since Instruction::FastMathFlags is a class, seems like the constructor could take in Record[OpNum] , and assign the flags.

Looking forward to the full patch.


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