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Hi, Eli, Mike and Lang: Thank you all for the input. This is one e.g which might be difficult for isel: a*b + c*d + e => a*b + (c*d + e). Thanks Shuxin On 12/12/12 4:43 PM, Lang Hames wrote: > A little background: > > The fmuladd intrinsic was introduced to support the FP_CONTRACT pragma > in C. llvm.fmuladd.* is generated by clang when it sees an expression > of the

A little background: The fmuladd intrinsic was introduced to support the FP_CONTRACT pragma in C. llvm.fmuladd.* is generated by clang when it sees an expression of the form 'a * b + c' within a single source statement. If you want to opportunistically form FMA target instructions my inclination would be to skip llvm.fmuladd.* and just form them from a*b+c expressions at isel time. I