From 0c5263683a5ccfdbad725dd2458573a8fcf7556c Mon Sep 17 00:00:00 2001
From: wolfbeast <mcwerewolf@gmail.com>
Date: Thu, 13 Dec 2018 12:24:17 +0100
Subject: [PATCH] Restrict ExtractLinearSum to find non-wrapping results.

---
 js/src/jit/RangeAnalysis.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/src/jit/RangeAnalysis.cpp b/js/src/jit/RangeAnalysis.cpp
index 95484c2494..d64f9b8ca4 100644
--- a/js/src/jit/RangeAnalysis.cpp
+++ b/js/src/jit/RangeAnalysis.cpp
@@ -2167,7 +2167,7 @@ RangeAnalysis::analyzeLoopPhi(MBasicBlock* header, LoopIterationBound* loopBound
     if (initial->block()->isMarked())
         return;
 
-    SimpleLinearSum modified = ExtractLinearSum(phi->getLoopBackedgeOperand());
+    SimpleLinearSum modified = ExtractLinearSum(phi->getLoopBackedgeOperand(), MathSpace::Infinite);
 
     if (modified.term != phi || modified.constant == 0)
         return;