aeubanks created this revision.
aeubanks updated this revision to Diff 378327.
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aeubanks retitled this revision from "[clang] Always pass
-clear-ast-before-backend" to "[clang] Pass -clear-ast-before-backend".
aeubanks edited the summary of this revision.
aeubanks added reviewers: rnk, dblaikie.
aeubanks retitled this revision from "[clang] Pass -clear-ast-before-backend"
to "[clang] Pass -clear-ast-before-backend in Clang::ConstructJob()".
aeubanks published this revision for review.
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update
This clears the memory used for the Clang AST before we run LLVM passes.
https://llvm-compile-time-tracker.com/compare.php?from=b6a8c695542b2987eb9a203d5663a0740cb4725f&to=05aa5c451dd87b6a8d6c2410eaccb25edf15a16f&stat=max-rss
shows significant memory savings with no slowdown (in fact -O0 slightly speeds
up).
For more background, see
https://lists.llvm.org/pipermail/cfe-dev/2021-September/068930.html.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D111270
Files:
clang/lib/Driver/ToolChains/Clang.cpp
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -4661,6 +4661,7 @@
// cleanup.
if (!C.isForDiagnostics())
CmdArgs.push_back("-disable-free");
+ CmdArgs.push_back("-clear-ast-before-backend");
#ifdef NDEBUG
const bool IsAssertBuild = false;
Index: clang/lib/Driver/ToolChains/Clang.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Clang.cpp
+++ clang/lib/Driver/ToolChains/Clang.cpp
@@ -4661,6 +4661,7 @@
// cleanup.
if (!C.isForDiagnostics())
CmdArgs.push_back("-disable-free");
+ CmdArgs.push_back("-clear-ast-before-backend");
#ifdef NDEBUG
const bool IsAssertBuild = false;
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