Re: [Jikesrvm-researchers] Minor Variation in Bytecode Selection has large impact on application performance -- Why?

[Eliot M. <mo...@cs...>]

Ben -- See OPT_BC2IR.java in rvm/src/vm/compilers/optimizing/ir/conversion/bc2hir.
In it, the ifeq specifically checks for certain things immediately
preceding it, including dcmpl, and translates to a specific internal
operator. Now why the other form optimizes better is not clear, except it
could be that later code generator patterns or optimizations are there for
int compares but not for double ones. Dave Grove might more readily answer
that :-).

-- Eliot