[polly] r287265 - [DBG] Allow to emit the RTC value at runtime

[Johannes Doerfert via llvm-commits]

Author: jdoerfert
Date: Thu Nov 17 15:49:19 2016
New Revision: 287265

URL: http://llvm.org/viewvc/llvm-project?rev=287265&view=rev
Log:
[DBG] Allow to emit the RTC value at runtime

The new command line flag "polly-codegen-emit-rtc-print" can be used to
place a "printf" in the generated code that will print the RTC value and
the overflow state.

Modified:
    polly/trunk/lib/CodeGen/IslNodeBuilder.cpp

Modified: polly/trunk/lib/CodeGen/IslNodeBuilder.cpp
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/lib/CodeGen/IslNodeBuilder.cpp?rev=287265&r1=287264&r2=287265&view=diff
==============================================================================
--- polly/trunk/lib/CodeGen/IslNodeBuilder.cpp (original)
+++ polly/trunk/lib/CodeGen/IslNodeBuilder.cpp Thu Nov 17 15:49:19 2016
@@ -18,10 +18,12 @@
 #include "polly/CodeGen/IslAst.h"
 #include "polly/CodeGen/IslExprBuilder.h"
 #include "polly/CodeGen/LoopGenerators.h"
+#include "polly/CodeGen/RuntimeDebugBuilder.h"
 #include "polly/CodeGen/Utils.h"
 #include "polly/Config/config.h"
 #include "polly/DependenceInfo.h"
 #include "polly/LinkAllPasses.h"
+#include "polly/Options.h"
 #include "polly/ScopInfo.h"
 #include "polly/Support/GICHelper.h"
 #include "polly/Support/SCEVValidator.h"
@@ -54,6 +56,11 @@ using namespace llvm;
 // trigger for corner cases (e.g., the "dct_luma" function in h264, SPEC2006).
 static int const MaxDimensionsInAccessRange = 9;
 
+static cl::opt<bool> PollyGenerateRTCPrint(
+    "polly-codegen-emit-rtc-print",
+    cl::desc("Emit code that prints the runtime check result dynamically."),
+    cl::Hidden, cl::init(false), cl::ZeroOrMore, cl::cat(PollyCategory));
+
 __isl_give isl_ast_expr *
 IslNodeBuilder::getUpperBound(__isl_keep isl_ast_node *For,
                               ICmpInst::Predicate &Predicate) {
@@ -1320,6 +1327,15 @@ Value *IslNodeBuilder::createRTC(isl_ast
     RTC = Builder.CreateIsNotNull(RTC);
   Value *OverflowHappened =
       Builder.CreateNot(ExprBuilder.getOverflowState(), "polly.rtc.overflown");
+
+  if (PollyGenerateRTCPrint) {
+    auto *F = Builder.GetInsertBlock()->getParent();
+    RuntimeDebugBuilder::createCPUPrinter(
+        Builder, "F: " + F->getName().str() + " R: " +
+                     S.getRegion().getNameStr() + " __RTC: ",
+        RTC, " Overflow: ", OverflowHappened);
+  }
+
   RTC = Builder.CreateAnd(RTC, OverflowHappened, "polly.rtc.result");
   ExprBuilder.setTrackOverflow(false);
   return RTC;