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<title>[191838] trunk/Source/JavaScriptCore</title>
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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/191838">191838</a></dd>
<dt>Author</dt> <dd>benjamin@webkit.org</dd>
<dt>Date</dt> <dd>2015-10-30 21:03:58 -0700 (Fri, 30 Oct 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>[JSC] Add lowering for B3's Sub operation with integers
https://bugs.webkit.org/show_bug.cgi?id=150749
Patch by Benjamin Poulain <bpoulain@apple.com> on 2015-10-30
Reviewed by Filip Pizlo.
* b3/B3LowerToAir.cpp:
(JSC::B3::Air::LowerToAir::trySub):
(JSC::B3::Air::LowerToAir::tryStoreSubLoad):
* b3/B3LoweringMatcher.patterns:
Identical to Add but obviously NotCommutative.
* b3/B3ReduceStrength.cpp:
Turn Add/Sub with zero into an identity. I only added for
Add since Sub with a constant is always turned into an Add.
Also switched the Sub optimizations to put the strongest first.
* b3/air/AirOpcode.opcodes:
* b3/testb3.cpp:
(JSC::B3::testAddArgImm):
(JSC::B3::testAddImmArg):
(JSC::B3::testSubArgs):
(JSC::B3::testSubArgImm):
(JSC::B3::testSubImmArg):
(JSC::B3::testSubArgs32):
(JSC::B3::testSubArgImm32):
(JSC::B3::testSubImmArg32):
(JSC::B3::testStoreSubLoad):
(JSC::B3::run):</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreb3B3LowerToAircpp">trunk/Source/JavaScriptCore/b3/B3LowerToAir.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreb3B3LoweringMatcherpatterns">trunk/Source/JavaScriptCore/b3/B3LoweringMatcher.patterns</a></li>
<li><a href="#trunkSourceJavaScriptCoreb3B3ReduceStrengthcpp">trunk/Source/JavaScriptCore/b3/B3ReduceStrength.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreb3airAirOpcodeopcodes">trunk/Source/JavaScriptCore/b3/air/AirOpcode.opcodes</a></li>
<li><a href="#trunkSourceJavaScriptCoreb3testb3cpp">trunk/Source/JavaScriptCore/b3/testb3.cpp</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (191837 => 191838)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog 2015-10-31 04:02:19 UTC (rev 191837)
+++ trunk/Source/JavaScriptCore/ChangeLog 2015-10-31 04:03:58 UTC (rev 191838)
</span><span class="lines">@@ -1,5 +1,37 @@
</span><span class="cx"> 2015-10-30 Benjamin Poulain <bpoulain@apple.com>
</span><span class="cx">
</span><ins>+ [JSC] Add lowering for B3's Sub operation with integers
+ https://bugs.webkit.org/show_bug.cgi?id=150749
+
+ Reviewed by Filip Pizlo.
+
+ * b3/B3LowerToAir.cpp:
+ (JSC::B3::Air::LowerToAir::trySub):
+ (JSC::B3::Air::LowerToAir::tryStoreSubLoad):
+ * b3/B3LoweringMatcher.patterns:
+ Identical to Add but obviously NotCommutative.
+
+ * b3/B3ReduceStrength.cpp:
+ Turn Add/Sub with zero into an identity. I only added for
+ Add since Sub with a constant is always turned into an Add.
+
+ Also switched the Sub optimizations to put the strongest first.
+
+ * b3/air/AirOpcode.opcodes:
+ * b3/testb3.cpp:
+ (JSC::B3::testAddArgImm):
+ (JSC::B3::testAddImmArg):
+ (JSC::B3::testSubArgs):
+ (JSC::B3::testSubArgImm):
+ (JSC::B3::testSubImmArg):
+ (JSC::B3::testSubArgs32):
+ (JSC::B3::testSubArgImm32):
+ (JSC::B3::testSubImmArg32):
+ (JSC::B3::testStoreSubLoad):
+ (JSC::B3::run):
+
+2015-10-30 Benjamin Poulain <bpoulain@apple.com>
+
</ins><span class="cx"> [JSC] Add the Air Opcode definitions to the Xcode project file
</span><span class="cx"> https://bugs.webkit.org/show_bug.cgi?id=150701
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3B3LowerToAircpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/b3/B3LowerToAir.cpp (191837 => 191838)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/B3LowerToAir.cpp 2015-10-31 04:02:19 UTC (rev 191837)
+++ trunk/Source/JavaScriptCore/b3/B3LowerToAir.cpp 2015-10-31 04:03:58 UTC (rev 191838)
</span><span class="lines">@@ -547,6 +547,21 @@
</span><span class="cx"> return false;
</span><span class="cx"> }
</span><span class="cx"> }
</span><ins>+
+ bool trySub(Value* left, Value* right)
+ {
+ switch (left->type()) {
+ case Int32:
+ appendBinOp<Sub32>(left, right);
+ return true;
+ case Int64:
+ appendBinOp<Sub64>(left, right);
+ return true;
+ default:
+ // FIXME: Implement more types!
+ return false;
+ }
+ }
</ins><span class="cx">
</span><span class="cx"> bool tryAnd(Value* left, Value* right)
</span><span class="cx"> {
</span><span class="lines">@@ -573,7 +588,18 @@
</span><span class="cx"> return false;
</span><span class="cx"> }
</span><span class="cx"> }
</span><del>-
</del><ins>+
+ bool tryStoreSubLoad(Value* left, Value* right, Value*)
+ {
+ switch (left->type()) {
+ case Int32:
+ return tryAppendStoreBinOp<Sub32, NotCommutative>(left, right);
+ default:
+ // FIXME: Implement more types!
+ return false;
+ }
+ }
+
</ins><span class="cx"> bool tryStoreAndLoad(Value* left, Value* right, Value*)
</span><span class="cx"> {
</span><span class="cx"> switch (left->type()) {
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3B3LoweringMatcherpatterns"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/b3/B3LoweringMatcher.patterns (191837 => 191838)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/B3LoweringMatcher.patterns 2015-10-31 04:02:19 UTC (rev 191837)
+++ trunk/Source/JavaScriptCore/b3/B3LoweringMatcher.patterns 2015-10-31 04:03:58 UTC (rev 191838)
</span><span class="lines">@@ -31,9 +31,11 @@
</span><span class="cx"> Load = Load(address)
</span><span class="cx">
</span><span class="cx"> Add = Add(left, right)
</span><ins>+Sub = Sub(left, right)
</ins><span class="cx"> And = BitAnd(left, right)
</span><span class="cx">
</span><span class="cx"> StoreAddLoad = Store(Add(left, right), address)
</span><ins>+StoreSubLoad = Store(Add(left, right), address)
</ins><span class="cx"> StoreAndLoad = Store(BitAnd(left, right), address)
</span><span class="cx"> Store = Store(value, address)
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3B3ReduceStrengthcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/b3/B3ReduceStrength.cpp (191837 => 191838)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/B3ReduceStrength.cpp 2015-10-31 04:02:19 UTC (rev 191837)
+++ trunk/Source/JavaScriptCore/b3/B3ReduceStrength.cpp 2015-10-31 04:03:58 UTC (rev 191838)
</span><span class="lines">@@ -107,10 +107,28 @@
</span><span class="cx">
</span><span class="cx"> // Turn this: Add(constant1, constant2)
</span><span class="cx"> // Into this: constant1 + constant2
</span><del>- replaceWithNewValue(m_value->child(0)->addConstant(m_proc, m_value->child(1)));
</del><ins>+ if (Value* constantAdd = m_value->child(0)->addConstant(m_proc, m_value->child(1))) {
+ replaceWithNewValue(constantAdd);
+ break;
+ }
+
+ // Turn this: Add(value, zero)
+ // Into an Identity.
+ if (m_value->child(1)->isInt(0)) {
+ m_value->replaceWithIdentity(m_value->child(0));
+ m_changed = true;
+ break;
+ }
</ins><span class="cx"> break;
</span><span class="cx">
</span><span class="cx"> case Sub:
</span><ins>+ // Turn this: Sub(constant1, constant2)
+ // Into this: constant1 - constant2
+ if (Value* constantSub = m_value->child(0)->subConstant(m_proc, m_value->child(1))) {
+ replaceWithNewValue(constantSub);
+ break;
+ }
+
</ins><span class="cx"> // Turn this: Sub(value, constant)
</span><span class="cx"> // Into this: Add(value, -constant)
</span><span class="cx"> if (isInt(m_value->type())) {
</span><span class="lines">@@ -122,9 +140,6 @@
</span><span class="cx"> }
</span><span class="cx"> }
</span><span class="cx">
</span><del>- // Turn this: Sub(constant1, constant2)
- // Into this: constant1 - constant2
- replaceWithNewValue(m_value->child(0)->subConstant(m_proc, m_value->child(1)));
</del><span class="cx"> break;
</span><span class="cx">
</span><span class="cx"> case Load8Z:
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3airAirOpcodeopcodes"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/b3/air/AirOpcode.opcodes (191837 => 191838)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/air/AirOpcode.opcodes 2015-10-31 04:02:19 UTC (rev 191837)
+++ trunk/Source/JavaScriptCore/b3/air/AirOpcode.opcodes 2015-10-31 04:03:58 UTC (rev 191838)
</span><span class="lines">@@ -78,6 +78,17 @@
</span><span class="cx"> Add64 U:G, U:G, D:G
</span><span class="cx"> Imm, Tmp, Tmp
</span><span class="cx">
</span><ins>+Sub32 U:G, UD:G
+ Tmp, Tmp
+ Imm, Addr
+ Imm, Tmp
+ Addr, Tmp
+ Tmp, Addr
+
+Sub64 U:G, UD:G
+ Tmp, Tmp
+ Imm, Tmp
+
</ins><span class="cx"> Lea UA:G, D:G
</span><span class="cx"> Addr, Tmp
</span><span class="cx">
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreb3testb3cpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/b3/testb3.cpp (191837 => 191838)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/b3/testb3.cpp 2015-10-31 04:02:19 UTC (rev 191837)
+++ trunk/Source/JavaScriptCore/b3/testb3.cpp 2015-10-31 04:03:58 UTC (rev 191838)
</span><span class="lines">@@ -134,6 +134,34 @@
</span><span class="cx"> CHECK(compileAndRun<int>(proc, a, b) == a + b);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+void testAddArgImm(int a, int b)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Value>(
+ proc, Add, Origin(),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0),
+ root->appendNew<Const64Value>(proc, Origin(), b)));
+
+ CHECK(compileAndRun<int>(proc, a) == a + b);
+}
+
+void testAddImmArg(int a, int b)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Value>(
+ proc, Add, Origin(),
+ root->appendNew<Const64Value>(proc, Origin(), a),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0)));
+
+ CHECK(compileAndRun<int>(proc, b) == a + b);
+}
+
</ins><span class="cx"> void testAddArgs32(int a, int b)
</span><span class="cx"> {
</span><span class="cx"> Procedure proc;
</span><span class="lines">@@ -152,6 +180,98 @@
</span><span class="cx"> CHECK(compileAndRun<int>(proc, a, b) == a + b);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+void testSubArgs(int a, int b)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Value>(
+ proc, Sub, Origin(),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR1)));
+
+ CHECK(compileAndRun<int>(proc, a, b) == a - b);
+}
+
+void testSubArgImm(int64_t a, int64_t b)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Value>(
+ proc, Sub, Origin(),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0),
+ root->appendNew<Const64Value>(proc, Origin(), b)));
+
+ CHECK(compileAndRun<int64_t>(proc, a) == a - b);
+}
+
+void testSubImmArg(int a, int b)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Value>(
+ proc, Sub, Origin(),
+ root->appendNew<Const64Value>(proc, Origin(), a),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0)));
+
+ CHECK(compileAndRun<int>(proc, b) == a - b);
+}
+
+void testSubArgs32(int a, int b)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Value>(
+ proc, Sub, Origin(),
+ root->appendNew<Value>(
+ proc, Trunc, Origin(),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0)),
+ root->appendNew<Value>(
+ proc, Trunc, Origin(),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR1))));
+
+ CHECK(compileAndRun<int>(proc, a, b) == a - b);
+}
+
+void testSubArgImm32(int a, int b)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Value>(
+ proc, Sub, Origin(),
+ root->appendNew<Value>(
+ proc, Trunc, Origin(),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0)),
+ root->appendNew<Const32Value>(proc, Origin(), b)));
+
+ CHECK(compileAndRun<int>(proc, a) == a - b);
+}
+
+void testSubImmArg32(int a, int b)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Value>(
+ proc, Sub, Origin(),
+ root->appendNew<Const32Value>(proc, Origin(), a),
+ root->appendNew<Value>(
+ proc, Trunc, Origin(),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0))));
+
+ CHECK(compileAndRun<int>(proc, b) == a - b);
+}
+
</ins><span class="cx"> void testStore(int value)
</span><span class="cx"> {
</span><span class="cx"> Procedure proc;
</span><span class="lines">@@ -270,6 +390,30 @@
</span><span class="cx"> CHECK(slot == 37 + amount);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+void testStoreSubLoad(int amount)
+{
+ Procedure proc;
+ BasicBlock* root = proc.addBlock();
+ int32_t startValue = std::numeric_limits<int32_t>::min();
+ int32_t slot = startValue;
+ ConstPtrValue* slotPtr = root->appendNew<ConstPtrValue>(proc, Origin(), &slot);
+ root->appendNew<MemoryValue>(
+ proc, Store, Origin(),
+ root->appendNew<Value>(
+ proc, Sub, Origin(),
+ root->appendNew<MemoryValue>(proc, Load, Int32, Origin(), slotPtr),
+ root->appendNew<Value>(
+ proc, Trunc, Origin(),
+ root->appendNew<ArgumentRegValue>(proc, Origin(), GPRInfo::argumentGPR0))),
+ slotPtr);
+ root->appendNew<ControlValue>(
+ proc, Return, Origin(),
+ root->appendNew<Const32Value>(proc, Origin(), 0));
+
+ CHECK(!compileAndRun<int>(proc, amount));
+ CHECK(slot == startValue - amount);
+}
+
</ins><span class="cx"> void testStoreAddLoadInterference(int amount)
</span><span class="cx"> {
</span><span class="cx"> Procedure proc;
</span><span class="lines">@@ -944,10 +1088,45 @@
</span><span class="cx"> RUN(test42());
</span><span class="cx"> RUN(testLoad42());
</span><span class="cx"> RUN(testArg(43));
</span><ins>+
</ins><span class="cx"> RUN(testAddArgs(1, 1));
</span><span class="cx"> RUN(testAddArgs(1, 2));
</span><ins>+ RUN(testAddArgImm(1, 2));
+ RUN(testAddArgImm(0, 2));
+ RUN(testAddArgImm(1, 0));
+ RUN(testAddImmArg(1, 2));
+ RUN(testAddImmArg(0, 2));
+ RUN(testAddImmArg(1, 0));
</ins><span class="cx"> RUN(testAddArgs32(1, 1));
</span><span class="cx"> RUN(testAddArgs32(1, 2));
</span><ins>+
+ RUN(testSubArgs(1, 1));
+ RUN(testSubArgs(1, 2));
+ RUN(testSubArgs(13, -42));
+ RUN(testSubArgs(-13, 42));
+ RUN(testSubArgImm(1, 1));
+ RUN(testSubArgImm(1, 2));
+ RUN(testSubArgImm(13, -42));
+ RUN(testSubArgImm(-13, 42));
+ RUN(testSubArgImm(42, 0));
+ RUN(testSubImmArg(1, 1));
+ RUN(testSubImmArg(1, 2));
+ RUN(testSubImmArg(13, -42));
+ RUN(testSubImmArg(-13, 42));
+
+ RUN(testSubArgs32(1, 1));
+ RUN(testSubArgs32(1, 2));
+ RUN(testSubArgs32(13, -42));
+ RUN(testSubArgs32(-13, 42));
+ RUN(testSubArgImm32(1, 1));
+ RUN(testSubArgImm32(1, 2));
+ RUN(testSubArgImm32(13, -42));
+ RUN(testSubArgImm32(-13, 42));
+ RUN(testSubImmArg32(1, 1));
+ RUN(testSubImmArg32(1, 2));
+ RUN(testSubImmArg32(13, -42));
+ RUN(testSubImmArg32(-13, 42));
+
</ins><span class="cx"> RUN(testStore(44));
</span><span class="cx"> RUN(testStoreConstant(49));
</span><span class="cx"> RUN(testStoreConstantPtr(49));
</span><span class="lines">@@ -956,6 +1135,7 @@
</span><span class="cx"> RUN(testAdd1Ptr(51));
</span><span class="cx"> RUN(testAdd1Ptr(bitwise_cast<intptr_t>(vm)));
</span><span class="cx"> RUN(testStoreAddLoad(46));
</span><ins>+ RUN(testStoreSubLoad(46));
</ins><span class="cx"> RUN(testStoreAddLoadInterference(52));
</span><span class="cx"> RUN(testStoreAddAndLoad(47, 0xffff));
</span><span class="cx"> RUN(testStoreAddAndLoad(470000, 0xffff));
</span></span></pre>
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