Changeset 58902 in webkit for trunk/JavaScriptCore/jit/JSInterfaceJIT.h

Timestamp:

May 6, 2010, 12:39:54 PM (15 years ago)

Author:

[email protected]

Message:

2010-05-06 Oliver Hunt <​[email protected]>

Reviewed by Geoffrey Garen.

Improve performance of single character string compares
​https://bugs.webkit.org/show_bug.cgi?id=38659

Add logic to the jit to identify comparisons to single character string literals
and then just perform the comparison inline, rather than ignoring the evidence
and attempting to perform an integer comparison.

Multiple changes required -- add jnlesseq opcode, add helper function to identify
single character string constants, add a helper to load single character strings.
Then add the 32_64 and normal codepaths to the JIT.

• assembler/MacroAssemblerX86Common.h: (JSC::MacroAssemblerX86Common::load16):
• bytecode/CodeBlock.cpp: (JSC::CodeBlock::dump):
• bytecode/Opcode.h:
• bytecompiler/BytecodeGenerator.cpp: (JSC::BytecodeGenerator::emitJumpIfTrue):
• interpreter/Interpreter.cpp: (JSC::Interpreter::privateExecute):
• jit/JIT.cpp: (JSC::JIT::privateCompileMainPass): (JSC::JIT::privateCompileSlowCases):
• jit/JIT.h:
• jit/JITArithmetic.cpp: (JSC::JIT::emit_op_jnless): (JSC::JIT::emitSlow_op_jnless): (JSC::JIT::emit_op_jless): (JSC::JIT::emitSlow_op_jless): (JSC::JIT::emit_op_jlesseq): (JSC::JIT::emit_op_jnlesseq): (JSC::JIT::emitSlow_op_jlesseq): (JSC::JIT::emitSlow_op_jnlesseq):
• jit/JITArithmetic32_64.cpp: (JSC::JIT::emit_op_jnless): (JSC::JIT::emitSlow_op_jnless): (JSC::JIT::emit_op_jless): (JSC::JIT::emitSlow_op_jless): (JSC::JIT::emit_op_jlesseq): (JSC::JIT::emit_op_jnlesseq): (JSC::JIT::emitSlow_op_jlesseq): (JSC::JIT::emitSlow_op_jnlesseq): (JSC::JIT::emitBinaryDoubleOp):
• jit/JITInlineMethods.h: (JSC::JIT::emitLoadCharacterString): (JSC::JIT::isOperandConstantImmediateChar):
• jit/JSInterfaceJIT.h: (JSC::ThunkHelpers::stringImplDataOffset): (JSC::ThunkHelpers::jsStringLengthOffset): (JSC::ThunkHelpers::jsStringValueOffset): Moved from ThunkGenerators to make it possible to share.
• jit/ThunkGenerators.cpp:

2010-05-06 Oliver Hunt <​[email protected]>

Reviewed by Geoffrey Garen.

Improve performance of single character string compares
​https://bugs.webkit.org/show_bug.cgi?id=38659

Add many tests of <, >, <=, >=, ==, ===, !=, !== as the existing
tests were woefully inadequate.

• fast/js/comparison-operators-expected.txt: Added.
• fast/js/comparison-operators-greater-expected.txt: Added.
• fast/js/comparison-operators-greater.html: Added.
• fast/js/comparison-operators-less-expected.txt: Added.
• fast/js/comparison-operators-less.html: Added.
• fast/js/comparison-operators.html: Added.
• fast/js/script-tests/comparison-operators-greater.js: Added. (description.makeTest.func.f.toString): (description.makeTest): (doTest):
• fast/js/script-tests/comparison-operators-less.js: Added. (description.makeTest.func.f.toString): (description.makeTest): (doTest):
• fast/js/script-tests/comparison-operators.js: Added. (description.makeTest.func.f.toString): (description.makeTest): (doTest):

File:

• trunk/JavaScriptCore/jit/JSInterfaceJIT.h (modified) (1 diff)

trunk/JavaScriptCore/jit/JSInterfaceJIT.h

@@ -176 +176 @@
     };
 
+    struct ThunkHelpers {
+        static unsigned stringImplDataOffset() { return WebCore::StringImpl::dataOffset(); }
+        static unsigned jsStringLengthOffset() { return OBJECT_OFFSETOF(JSString, m_length); }
+        static unsigned jsStringValueOffset() { return OBJECT_OFFSETOF(JSString, m_value); }
+    };
+
 #if USE(JSVALUE32_64)
     inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload)