Add support for the BOLT post-link binary optimizer

Using [bolt](https://github.com/llvm/llvm-project/tree/main/bolt)
provides a fairly large speedup without any code or functionality
changes. It provides roughly a 1% speedup on pyperformance, and a
4% improvement on the Pyston web macrobenchmarks.

It is gated behind an `--enable-bolt` configure arg because not all
toolchains and environments are supported. It has been tested on a
Linux x86_64 toolchain, using llvm-bolt built from the LLVM 14.0.6
sources (their binary distribution of this version did not include bolt).

Compared to [a previous attempt](faster-cpython/ideas#224),
this commit uses bolt's preferred "instrumentation" approach, as well as adds some non-PIE
flags which enable much better optimizations from bolt.

The effects of this change are a bit more dependent on CPU microarchitecture
than other changes, since it optimizes i-cache behavior which seems
to be a bit more variable between architectures. The 1%/4% numbers
were collected on an Intel Skylake CPU, and on an AMD Zen 3 CPU I
got a slightly larger speedup (2%/4%), and on a c6i.xlarge EC2 instance
I got a slightly lower speedup (1%/3%).

The low speedup on pyperformance is not entirely unexpected, because
BOLT improves i-cache behavior, and the benchmarks in the pyperformance
suite are small and tend to fit in i-cache.

This change uses the existing pgo profiling task (`python -m test --pgo`),
though I was able to measure about a 1% macrobenchmark improvement by
using the macrobenchmarks as the training task. I personally think that
both the PGO and BOLT tasks should be updated to use macrobenchmarks,
but for the sake of splitting up the work this PR uses the existing pgo task.

Author: kmod

Makefile.pre.in

@@ -640,6 +640,15 @@ profile-opt: profile-run-stamp
 	-rm -f profile-clean-stamp
 	$(MAKE) @DEF_MAKE_RULE@ CFLAGS_NODIST="$(CFLAGS_NODIST) $(PGO_PROF_USE_FLAG)" LDFLAGS_NODIST="$(LDFLAGS_NODIST)"
 
+bolt-opt: @PREBOLT_RULE@
+	rm -f *.fdata
+	@LLVM_BOLT@ $(BUILDPYTHON) -instrument -instrumentation-file-append-pid -instrumentation-file=$(abspath $(BUILDPYTHON).bolt) -o $(BUILDPYTHON).bolt_inst
+	./$(BUILDPYTHON).bolt_inst $(PROFILE_TASK) || true
+	@MERGE_FDATA@ $(BUILDPYTHON).*.fdata > $(BUILDPYTHON).fdata
+	@LLVM_BOLT@ $(BUILDPYTHON) -o $(BUILDPYTHON).bolt -data=$(BUILDPYTHON).fdata -update-debug-sections -reorder-blocks=ext-tsp -reorder-functions=hfsort+ -split-functions=3 -icf=1 -inline-all -split-eh -reorder-functions-use-hot-size -peepholes=all -jump-tables=aggressive -inline-ap -indirect-call-promotion=all -dyno-stats -use-gnu-stack -frame-opt=hot
+	rm -f *.fdata
+	mv $(BUILDPYTHON).bolt $(BUILDPYTHON)
+
 # Compile and run with gcov
 .PHONY=coverage coverage-lcov coverage-report
 coverage:

Misc/no-pie-compile.specs

@@ -0,0 +1,2 @@
+*self_spec:
++ %{!r:%{!fpie:%{!fPIE:%{!fpic:%{!fPIC:%{!fno-pic:-fno-PIE}}}}}}

Misc/no-pie-link.specs

@@ -0,0 +1,2 @@
+*self_spec:
++ %{!shared:%{!r:%{!fPIE:%{!pie:-fno-PIE -no-pie}}}}

configure

@@ -1917,6 +1917,57 @@ if test "$Py_LTO" = 'true' ; then
   LDFLAGS_NODIST="$LDFLAGS_NODIST $LTOFLAGS"
 fi
 
+# Enable bolt flags
+Py_BOLT='false'
+AC_MSG_CHECKING(for --enable-bolt)
+AC_ARG_ENABLE(bolt, AS_HELP_STRING(
+                [--enable-bolt],
+                [enable usage of the llvm-bolt post-link optimizer (default is no)]),
+[
+if test "$enableval" != no
+then
+  Py_BOLT='true'
+  AC_MSG_RESULT(yes);
+else
+  Py_BOLT='false'
+  AC_MSG_RESULT(no);
+fi],
+[AC_MSG_RESULT(no)])
+
+AC_SUBST(PREBOLT_RULE)
+if test "$Py_BOLT" = 'true' ; then
+  PREBOLT_RULE="${DEF_MAKE_ALL_RULE}"
+  DEF_MAKE_ALL_RULE="bolt-opt"
+  DEF_MAKE_RULE="build_all"
+
+  # These flags are required for bolt to work:
+  CFLAGS_NODIST="$CFLAGS_NODIST -fno-reorder-blocks-and-partition"
+  LDFLAGS_NODIST="$LDFLAGS_NODIST -Wl,--emit-relocs"
+
+  # These flags are required to get good performance from bolt:
+  CFLAGS_NODIST="$CFLAGS_NODIST -specs=Misc/no-pie-compile.specs"
+  LDFLAGS_NODIST="$LDFLAGS_NODIST -specs=Misc/no-pie-link.specs"
+  LDFLAGS_NOLTO="$LDFLAGS_NOLTO -specs=Misc/no-pie-link.specs"
+
+  AC_SUBST(LLVM_BOLT)
+  AC_PATH_TOOL(LLVM_BOLT, llvm-bolt, '', ${llvm_path})
+  if test -n "${LLVM_BOLT}" -a -x "${LLVM_BOLT}"
+  then
+    AC_MSG_RESULT("Found llvm-bolt")
+  else
+    AC_MSG_ERROR([llvm-bolt is required for a --enable-bolt build but could not be found.])
+  fi
+
+  AC_SUBST(MERGE_FDATA)
+  AC_PATH_TOOL(MERGE_FDATA, merge-fdata, '', ${llvm_path})
+  if test -n "${MERGE_FDATA}" -a -x "${MERGE_FDATA}"
+  then
+    AC_MSG_RESULT("Found merge-fdata")
+  else
+    AC_MSG_ERROR([merge-fdata is required for a --enable-bolt build but could not be found.])
+  fi
+fi
+
 # Enable PGO flags.
 AC_SUBST(PGO_PROF_GEN_FLAG)
 AC_SUBST(PGO_PROF_USE_FLAG)