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. -- Josh
