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We have a suboptimal behavior in the way cling optimizes code in O2 mode.
Disable it until the issue is understood and fixed.
This commit is contained in:
Vassil Vassilev 2017-10-20 10:29:14 +02:00 committed by sftnight
parent 3256a1dc1f
commit c912c9437d
3 changed files with 11 additions and 8 deletions
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5
lib/Interpreter/CIFactory.cpp
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@ -1134,7 +1134,10 @@ static void stringifyPreprocSetting(PreprocessorOptions& PPOpts,
CGOpts.CXXCtorDtorAliases = 1;
#endif
// Reduce amount of emitted symbols by optimizing more.
CGOpts.OptimizationLevel = 2;
// FIXME: We have a bug when we switch to -O2, for some cases it takes
// several minutes to optimize, while the same code compiled by clang -O2
// takes only a few seconds.
CGOpts.OptimizationLevel = 0;
// Taken from a -O2 run of clang:
CGOpts.DiscardValueNames = 1;
CGOpts.OmitLeafFramePointer = 1;

4
test/Pragmas/opt.C
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@ -13,10 +13,10 @@ extern "C" int printf(const char*,...);
#include "cling/Interpreter/Transaction.h"
gCling->getDefaultOptLevel()
// CHECK: (int) 2
// CHECK: (int) 0
(int)gCling->getLatestTransaction()->getCompilationOpts().OptLevel
// CHECK-NEXT: (int) 2
// CHECK-NEXT: (int) 0
{
#pragma cling optimize(0)

10
test/Prompt/MetaProcessor/DotO.C
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@ -12,13 +12,13 @@ extern "C" int printf(const char*,...);
#include "cling/Interpreter/Interpreter.h"
#include "cling/Interpreter/Transaction.h"
gCling->getDefaultOptLevel() // CHECK: (int) 2
.O // CHECK-NEXT: Current cling optimization level: 2
(int)gCling->getLatestTransaction()->getCompilationOpts().OptLevel // CHECK-NEXT: (int) 2
.O 0
gCling->getDefaultOptLevel() // CHECK: (int) 0
.O // CHECK-NEXT: Current cling optimization level: 0
(int)gCling->getLatestTransaction()->getCompilationOpts().OptLevel // CHECK-NEXT: (int) 2
.O 2
gCling->getDefaultOptLevel() // CHECK: (int) 2
.O // CHECK-NEXT: Current cling optimization level: 2
#pragma cling optimize(1)
gCling->getDefaultOptLevel() // CHECK: (int) 0