search for: fnmsub

I have been doing some playing with the patterns that define complex instructions, and I saw a behavior that doesn't look right. I think its a bug in the PPC backend. The 32-bit PPC .td file defines a pattern for the fnmsubs instruction like this: def : Pat<(fsub F4RC:$B, (fmul F4RC:$A, F4RC:$C)), (FNMSUBS F4RC:$A, F4RC:$C, F4RC:$B)>, Requires<[FPContractions]>; The unique feature of this parttern is that it maps a pair of LLVM IR instructions into a single PPC instruction....

...s termed as FDA(Fused Division Accumulate) Sending the code patch(on llvm svn revision 167927), text description and testcases attached with this mail. Please review. Future enhance plans are as follows. TODO: 1. Enable vector rsqrt generation. 2. Generate different variations of FDA i.e. FMSUB, FNMSUB,FNMADD instruction generations as required. Best Regards, soham "The search for truth is more precious than its possession." -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20121115/7a8b9f33/atta...

...e svn revision 167927), text description and testcases attached with this mail. Also we want to commit these changes back to llvm codebase. Please review and suggest. Future enhance plans are as follows. TODO: 1. Enable vector rsqrt generation. 2. Generate different variations of FDA i.e. FMSUB, FNMSUB,FNMADD instruction generations as required. Best Regards, soham "The search for truth is more precious than its possession." -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20121115/3f05bfde/attac...