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: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Cc: [email protected] > > Reported-by: Peter Zijlstra <[email protected]> > > Signed-off-by: Josh Poimboeuf <[email protected]> > > Signed-off-by: Peter Zijlstra (Intel) <[email protected]> > > Link: https://lkml.kernel.org/r/20190307174802.46fmpysxyo35hh43@treble > > Missing "From" me.
Right, sorry, quilt eats that and I sometimes forget to fix up :/
