search for: ltoo

...number 2 is probably the best. > Some questions: > > * Should "clang -O3 foo.o -o foo" use LTO with -O3? > * Should "clang foo.o -o foo" use LTO with -O0? That would be a fairly > big change. Maybe we could make the LTO default be 3? > * Should we just add a --ltoO to the clang driver that is independent of > -O? > * Some linkers already take a -O(1,2,3) option. Should we try to > forward that or should we differentiate LTO optimizations and general > linker optimizations? > > The linker taking -O1,2,3 as a start is fine for sure. I'd ra...

+ OptLevel = opt[1] - '0'; Please check and reject things like -OX at least in the gold plugin. Can you add a test showing that * createLowerBitSetsPass is run at -O0 * the addLateLTOOptimizationPasses passes are run at -O1, but not -O0 I think the patch is fine otherwise, but wait for a review from someone on the ld64 side (Duncan, Manman or Bob for example). Thanks, Rafael On 19 March 2015 at 15:55, Peter Collingbourne <peter at pcc.me.uk> wrote: > On Thu, Mar 19,...

Hi all, I wanted to start a thread to discuss ways to control the optimization level when using LTO. We have found that there are use cases for the LTO mechanism beyond whole-program optimization, in which full optimization is not always needed or desired. We started that discussion over in http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150316/266560.html and I thought I'd

Hi Rafael, On 07/31/2017 04:20 PM, Rafael Avila de Espindola via llvm-dev wrote: > However, do we need to start with instrumentation? The original paper > uses sampling with good results and current intel cpus can record every > branch in a program. > > I would propose starting with just an lld patch that reads the call > graph from a file. The format would be very similar to

...oCFGProfileReorder; bool NoGnuUnique; bool NoUndefinedVersion; bool Nostdlib; diff --git a/ELF/Driver.cpp b/ELF/Driver.cpp index 1534c7e..06dd045 100644 --- a/ELF/Driver.cpp +++ b/ELF/Driver.cpp @@ -649,6 +649,7 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) { Config->LTOO = getInteger(Args, OPT_lto_O, 2); Config->LTOPartitions = getInteger(Args, OPT_lto_partitions, 1); Config->MapFile = getString(Args, OPT_Map); + Config->NoCFGProfileReorder = Args.hasArg(OPT_no_cfg_profile_reorder); Config->NoGnuUnique = Args.hasArg(OPT_no_gnu_unique); Conf...

...rofileReorder; bool NoGnuUnique; bool NoUndefinedVersion; bool NoinhibitExec; diff --git a/ELF/Driver.cpp b/ELF/Driver.cpp index 263ba7b..84d4d80 100644 --- a/ELF/Driver.cpp +++ b/ELF/Driver.cpp @@ -644,6 +644,7 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) { Config->LTOO = getInteger(Args, OPT_lto_O, 2); Config->LTOPartitions = getInteger(Args, OPT_lto_partitions, 1); Config->MapFile = Args.getLastArgValue(OPT_Map); + Config->NoCFGProfileReorder = Args.hasArg(OPT_no_cfg_profile_reorder); Config->NoGnuUnique = Args.hasArg(OPT_no_gnu_unique);...