[PATCH] D126800: Write output sections in parallel

[Michael Eisel via Phabricator via llvm-commits]

michaeleisel created this revision.
Herald added projects: lld-macho, All.
Herald added a reviewer: lld-macho.
michaeleisel requested review of this revision.
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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D126800

Files:
  lld/MachO/Writer.cpp


Index: lld/MachO/Writer.cpp
===================================================================
--- lld/MachO/Writer.cpp
+++ lld/MachO/Writer.cpp
@@ -20,6 +20,7 @@
 #include "SyntheticSections.h"
 #include "Target.h"
 #include "UnwindInfoSection.h"
+#include "llvm/Support/Parallel.h"
 
 #include "lld/Common/Arrays.h"
 #include "lld/Common/CommonLinkerContext.h"
@@ -1081,9 +1082,14 @@
 
 void Writer::writeSections() {
   uint8_t *buf = buffer->getBufferStart();
+  std::vector<const OutputSection *> osecs;
   for (const OutputSegment *seg : outputSegments)
     for (const OutputSection *osec : seg->getSections())
-      osec->writeTo(buf + osec->fileOff);
+      osecs.emplace_back(osec);
+
+  parallelForEach(osecs.begin(), osecs.end(), [&](const OutputSection *osec) {
+    osec->writeTo(buf + osec->fileOff);
+  });
 }
 
 // In order to utilize multiple cores, we first split the buffer into chunks,


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