On Mon, Mar 18, 2019 at 06:37:20PM -0500, Josh Poimboeuf wrote: > On Mon, Mar 18, 2019 at 04:38:42PM +0100, Peter Zijlstra wrote: > > With CONFIG_PROFILE_ALL_BRANCHES, the "if" macro converts the > > conditional to an array index. This can cause GCC to create horrible > > code. When there are nested ifs, the generated code uses register > > values to encode branching decisions. > > > > Make it easier for GCC to optimize by keeping the conditional as a > > conditional rather than converting it to an integer. This shrinks the > > generated code quite a bit, and also makes the code sane enough for > > objtool to understand. > > > > Cc: rost...@goodmis.org > > Cc: valentin.schnei...@arm.com > > Cc: l...@amacapital.net > > Cc: brge...@gmail.com > > Cc: catalin.mari...@arm.com > > Cc: mi...@kernel.org > > Cc: dvlas...@redhat.com > > Cc: will.dea...@arm.com > > Cc: julien.thie...@arm.com > > Cc: torva...@linux-foundation.org > > Cc: dvyu...@google.com > > Cc: b...@alien8.de > > Cc: t...@linutronix.de > > Cc: james.mo...@arm.com > > Cc: l...@kernel.org > > Cc: h...@zytor.com > > Reported-by: Peter Zijlstra <pet...@infradead.org> > > Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com> > > Signed-off-by: Peter Zijlstra (Intel) <pet...@infradead.org> > > Link: https://lkml.kernel.org/r/20190307174802.46fmpysxyo35hh43@treble > > Missing "From" me.
Right, sorry, quilt eats that and I sometimes forget to fix up :/
