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Turn off speculative devirtualization by default. (#29359)

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Turn off speculative devirtualization by default. Add a flag to support enabling the pass.
Fixes rdar://58778959 and rdar://58429282
This commit is contained in:
Meghana Gupta
2020-01-24 10:23:06 -08:00
committed by GitHub
parent 5669985665
commit 5285bf7200
17 changed files with 40 additions and 24 deletions
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4
include/swift/AST/SILOptions.h
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@@ -57,6 +57,10 @@ public:
/// purposes.
bool EnableOSSAOptimizations = true;
/// Controls whether to turn on speculative devirtualization.
/// It is turned off by default.
bool EnableSpeculativeDevirtualization = false;
/// Should we run any SIL performance optimizations
///
/// Useful when you want to enable -O LLVM opts but not -O SIL opts.

3
include/swift/Option/FrontendOptions.td
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@@ -282,6 +282,9 @@ def disable_ossa_opts : Flag<["-"], "disable-ossa-opts">,
def disable_sil_partial_apply : Flag<["-"], "disable-sil-partial-apply">,
HelpText<"Disable use of partial_apply in SIL generation">;
def enable_spec_devirt : Flag<["-"], "enable-spec-devirt">,
HelpText<"Enable speculative devirtualization pass.">;
def enable_ownership_stripping_after_serialization
: Flag<["-"], "enable-ownership-stripping-after-serialization">,
HelpText<"Strip ownership after serialization">;