Changeset 36408 in webkit for trunk/JavaScriptCore/VM/CodeBlock.cpp

Timestamp:

Sep 14, 2008, 4:01:03 PM (17 years ago)

Author:

[email protected]

Message:

2008-09-14 Cameron Zwarich <​[email protected]>

Reviewed by Oliver Hunt.

Bug 20816: op_lesseq should be optimized
<​https://bugs.webkit.org/show_bug.cgi?id=20816>

Add a loop_if_lesseq opcode that is similar to the loop_if_less opcode.

This is a 9.4% speedup on the V8 Crypto benchmark.

• VM/CTI.cpp: (JSC::CTI::privateCompileMainPass): (JSC::CTI::privateCompileSlowCases):
• VM/CodeBlock.cpp: (JSC::CodeBlock::dump):
• VM/CodeGenerator.cpp: (JSC::CodeGenerator::emitJumpIfTrue):
• VM/Machine.cpp: (JSC::Machine::privateExecute): (JSC::Machine::cti_op_loop_if_lesseq):
• VM/Machine.h:
• VM/Opcode.h:

File:

• trunk/JavaScriptCore/VM/CodeBlock.cpp (modified) (1 diff)

trunk/JavaScriptCore/VM/CodeBlock.cpp

@@ -690 +690 @@
             break;
         }
+        case op_loop_if_lesseq: {
+            int r0 = (++it)->u.operand;
+            int r1 = (++it)->u.operand;
+            int offset = (++it)->u.operand;
+            printf("[%4d] loop_if_lesseq\t %s, %s, %d(->%d)\n", location, registerName(r0).c_str(), registerName(r1).c_str(), offset, jumpTarget(begin, it, offset));
+            break;
+        }
         case op_switch_imm: {
             int tableIndex = (++it)->u.operand;