[SCEV] Have getRangeForAffineARHelper take StartRange by const reference to avoid a copy in many of the cases.

llvm-svn: 302398
2017-05-08 02:29:15 +00:00 · 2017-05-08 02:29:15 +00:00 · d6f2639fd7
parent 03de7c1501
commit d6f2639fd7
1 changed files with 1 additions and 1 deletions
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@ -4842,7 +4842,7 @@ ScalarEvolution::getRange(const SCEV *S,
 // from StartRange and then is changed by Step up to MaxBECount times. Signed
 // argument defines if we treat Step as signed or unsigned.
 static ConstantRange getRangeForAffineARHelper(APInt Step,
-                                               ConstantRange StartRange,
+                                               const ConstantRange &StartRange,
                                               const APInt &MaxBECount,
                                               unsigned BitWidth, bool Signed) {
  // If either Step or MaxBECount is 0, then the expression won't change, and we