Changeset 58902 in webkit for trunk/JavaScriptCore/jit/JIT.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/JIT.h (modified) (4 diffs)

trunk/JavaScriptCore/jit/JIT.h

@@ -673 +673 @@
         void emit_op_jnless(Instruction*);
         void emit_op_jless(Instruction*);
+        void emit_op_jlesseq(Instruction*, bool invert = false);
         void emit_op_jnlesseq(Instruction*);
         void emit_op_jsr(Instruction*);
@@ -760 +761 @@
         void emitSlow_op_jnless(Instruction*, Vector<SlowCaseEntry>::iterator&);
         void emitSlow_op_jless(Instruction*, Vector<SlowCaseEntry>::iterator&);
+        void emitSlow_op_jlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&, bool invert = false);
         void emitSlow_op_jnlesseq(Instruction*, Vector<SlowCaseEntry>::iterator&);
         void emitSlow_op_jtrue(Instruction*, Vector<SlowCaseEntry>::iterator&);
@@ -813 +815 @@
         JSValue getConstantOperand(unsigned src);
         bool isOperandConstantImmediateInt(unsigned src);
+        bool isOperandConstantImmediateChar(unsigned src);
 
         Jump getSlowCase(Vector<SlowCaseEntry>::iterator& iter)
@@ -836 +839 @@
         void restoreReturnAddressBeforeReturn(Address);
 
+        // Loads the character value of a single character string into dst.
+        void emitLoadCharacterString(RegisterID src, RegisterID dst, JumpList& failures);
+        
         void emitTimeoutCheck();
 #ifndef NDEBUG