Recommit r318963 "[APInt] Don't print debug messages from the APInt knuth division algorithm by default"
The previous commit had the condition in the do/while backwards.
Debug builds currently print out low level details of the Knuth division algorithm when -debug is used. This information isn't useful in most cases and just adds noise to the log.
This adds a new preprocessor flag to enable the prints in the knuth division code in APInt.
Differential Revision: https://reviews.llvm.org/D40404
llvm-svn: 318966
diff --git a/llvm/lib/Support/APInt.cpp b/llvm/lib/Support/APInt.cpp
index c558ddd..1ea6319 100644
--- a/llvm/lib/Support/APInt.cpp
+++ b/llvm/lib/Support/APInt.cpp
@@ -1252,6 +1252,14 @@
// b denotes the base of the number system. In our case b is 2^32.
const uint64_t b = uint64_t(1) << 32;
+// The DEBUG macros here tend to be spam in the debug output if you're not
+// debugging this code. Disable them unless KNUTH_DEBUG is defined.
+#pragma push_macro("DEBUG")
+#ifndef KNUTH_DEBUG
+#undef DEBUG
+#define DEBUG(X) do {} while (false)
+#endif
+
DEBUG(dbgs() << "KnuthDiv: m=" << m << " n=" << n << '\n');
DEBUG(dbgs() << "KnuthDiv: original:");
DEBUG(for (int i = m+n; i >=0; i--) dbgs() << " " << u[i]);
@@ -1391,6 +1399,8 @@
DEBUG(dbgs() << '\n');
}
DEBUG(dbgs() << '\n');
+
+#pragma pop_macro("DEBUG")
}
void APInt::divide(const WordType *LHS, unsigned lhsWords, const WordType *RHS,