From 2de8122c49831ed035988d703bb2d4dbcb030322 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Bargull?= <andre.bargull@gmail.com>
Date: Wed, 15 Apr 2020 10:05:09 +0000
Subject: [PATCH] Bug 1628836: Add missing JSOp::Pow case for string-int32
 arithmetic in CacheIR. r=jandem

Differential Revision: https://phabricator.services.mozilla.com/D70807

--HG--
extra : moz-landing-system : lando
---
 js/src/jit-test/tests/cacheir/string-int32-arith.js | 3 +++
 js/src/jit/CacheIR.cpp                              | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/js/src/jit-test/tests/cacheir/string-int32-arith.js b/js/src/jit-test/tests/cacheir/string-int32-arith.js
index 1a82ffb4134f..21de7e0d2932 100644
--- a/js/src/jit-test/tests/cacheir/string-int32-arith.js
+++ b/js/src/jit-test/tests/cacheir/string-int32-arith.js
@@ -13,6 +13,9 @@ function test(zero, one) {
     assertEq(one / 1, 1);
     assertEq(10 % one, 0);
     assertEq(one % 1, 0);
+
+    assertEq(10 ** one, 10);
+    assertEq(one ** 4, 1);
 }
 
 for (var i = 0; i < 10; i++) {
diff --git a/js/src/jit/CacheIR.cpp b/js/src/jit/CacheIR.cpp
index 2365b6522c28..ce13af8a38a0 100644
--- a/js/src/jit/CacheIR.cpp
+++ b/js/src/jit/CacheIR.cpp
@@ -7036,6 +7036,10 @@ AttachDecision BinaryArithIRGenerator::tryAttachStringInt32Arith() {
       writer.int32ModResult(lhsIntId, rhsIntId);
       trackAttached("BinaryArith.StringInt32.Mod");
       break;
+    case JSOp::Pow:
+      writer.int32PowResult(lhsIntId, rhsIntId);
+      trackAttached("BinaryArith.StringInt32.Pow");
+      break;
     default:
       MOZ_CRASH("Unhandled op in tryAttachStringInt32Arith");
   }