From 17e68c4a11ee44dbaf32f5d17abc30aa107a0a2d Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Sat, 6 Jan 2018 00:15:37 -0500
Subject: [PATCH] disable NewGVN

closes #673
---
 src/zig_llvm.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/zig_llvm.cpp b/src/zig_llvm.cpp
index 94d18b1d49..81e22187ed 100644
--- a/src/zig_llvm.cpp
+++ b/src/zig_llvm.cpp
@@ -126,7 +126,8 @@ bool ZigLLVMTargetMachineEmitToFile(LLVMTargetMachineRef targ_machine_ref, LLVMM
     PMBuilder->SLPVectorize = !is_debug;
     PMBuilder->LoopVectorize = !is_debug;
     PMBuilder->RerollLoops = !is_debug;
-    PMBuilder->NewGVN = !is_debug;
+    // Leaving NewGVN as default (off) because when on it caused issue #673
+    //PMBuilder->NewGVN = !is_debug;
     PMBuilder->DisableGVNLoadPRE = is_debug;
     PMBuilder->VerifyInput = assertions_on;
     PMBuilder->VerifyOutput = assertions_on;