[llvm-dev] [FP] Constant folding math library functions

Joerg Sonnenberger via llvm-dev llvm-dev at lists.llvm.org
Wed Apr 17 14:04:32 PDT 2019

On Wed, Apr 17, 2019 at 12:35:16PM -0700, Scott Manley via llvm-dev wrote:
> I don't mean to hijack this thread but after reading through some
> discussion here and poking around in the constant folder myself just now,
> is my understanding correct in that LLVM only uses host routines for
> constant folding? Has there been discussion in the past about using MPFR or
> something like it instead? (I'm aware that doing so wouldn't solve the
> original problem in the general case -- I'm asking out of curiosity).

Using MPFR doesn't solve anything, in fact it will often be worse as it
won't agree with even the native libm.


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