Displaying 2 results from an estimated 2 matches for "70afb11a".
2016 Oct 27
0
(RFC) Encoding code duplication factor in discriminator
Is there prior art for this sort of thing (in GCC, for example) - I take it
this isn't the first time this has come up as a problem for profile
accuracy? (so it'd be helpful to know prior solutions to this (& if we're
not doing whatever was done before, what it is about our situation that's
different, etc), or why it hasn't been a problem, etc)
On Thu, Oct 27, 2016 at
2016 Oct 27
8
(RFC) Encoding code duplication factor in discriminator
Motivation:
Many optimizations duplicate code. E.g. loop unroller duplicates the loop
body, GVN duplicates computation, etc. The duplicated code will share the
same debug info with the original code. For SamplePGO, the debug info is
used to present the profile. Code duplication will affect profile accuracy.
Taking loop unrolling for example:
#1 foo();
#2 for (i = 0; i < N; i++) {
#3 bar();