From 7bec7e608ef0fdbf5bf41c084023b3c4180e0571 Mon Sep 17 00:00:00 2001
From: Benjamin Bouvier <benj@benj.me>
Date: Mon, 22 Oct 2018 15:41:53 +0200
Subject: [PATCH] Bug 1500231: Fix register allocation of copysign on AVX;
 r=sunfish

--HG--
extra : rebase_source : 99a85227520130cc006fbb4ff8b6bb3d7a1a03f6
extra : amend_source : 81b0b96934c487246b0188d63ce4b3c02a82b417
---
 js/src/jit/x86-shared/Lowering-x86-shared.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/js/src/jit/x86-shared/Lowering-x86-shared.cpp b/js/src/jit/x86-shared/Lowering-x86-shared.cpp
index aa4a8edf77f5..17988759c029 100644
--- a/js/src/jit/x86-shared/Lowering-x86-shared.cpp
+++ b/js/src/jit/x86-shared/Lowering-x86-shared.cpp
@@ -704,10 +704,11 @@ LIRGenerator::visitCopySign(MCopySign* ins)
 
     // As lowerForFPU, but we want rhs to be in a FP register too.
     lir->setOperand(0, useRegisterAtStart(lhs));
-    lir->setOperand(1, lhs != rhs ? useRegister(rhs) : useRegisterAtStart(rhs));
     if (!Assembler::HasAVX()) {
+        lir->setOperand(1, lhs != rhs ? useRegister(rhs) : useRegisterAtStart(rhs));
         defineReuseInput(lir, ins, 0);
     } else {
+        lir->setOperand(1, useRegisterAtStart(rhs));
         define(lir, ins);
     }
 }