Changeset 72481 in webkit for trunk/JavaScriptCore/assembler/MacroAssemblerARMv7.h

Timestamp:

Nov 20, 2010, 2:02:36 PM (15 years ago)

Author:

[email protected]

Message:

2010-11-20 Gabor Loki <​[email protected]>

Reviewed by Gavin Barraclough.

Support JIT_OPTIMIZE_MOD on Thumb-2
​https://bugs.webkit.org/show_bug.cgi?id=49432

Rewrite the soft modulo operation into macroassembler form, and move it
to JSValue32_64 section.
Add support for soft modulo on Thumb-2 JIT also.

• assembler/ARMv7Assembler.h: (JSC::ARMv7Assembler::clz):
• assembler/MacroAssemblerARM.h: (JSC::MacroAssemblerARM::countLeadingZeros32): (JSC::MacroAssemblerARM::relativeTableJump):
• assembler/MacroAssemblerARMv7.h: (JSC::MacroAssemblerARMv7::countLeadingZeros32): (JSC::MacroAssemblerARMv7::relativeTableJump):
• jit/JITArithmetic.cpp: (JSC::JIT::emit_op_mod):
• jit/JITOpcodes.cpp: (JSC::JIT::privateCompileCTIMachineTrampolines):
• jit/JITOpcodes32_64.cpp: (JSC::JIT::softModulo):
• jit/JITStubs.cpp: (JSC::JITThunks::JITThunks):
• wtf/Platform.h:

File:

• trunk/JavaScriptCore/assembler/MacroAssemblerARMv7.h (modified) (2 diffs)

trunk/JavaScriptCore/assembler/MacroAssemblerARMv7.h

@@ -221 +221 @@
     }
 
+    void countLeadingZeros32(RegisterID src, RegisterID dest)
+    {
+        m_assembler.clz(dest, src);
+    }
+
     void lshift32(RegisterID shift_amount, RegisterID dest)
     {
@@ -1075 +1080 @@
     }
     
+    void relativeTableJump(RegisterID index, int scale)
+    {
+        ASSERT(scale >= 0 && scale <= 31);
+
+        // dataTempRegister will point after the jump if index register contains zero
+        move(ARMRegisters::pc, dataTempRegister);
+        m_assembler.add(dataTempRegister, dataTempRegister, ARMThumbImmediate::makeEncodedImm(9));
+
+        ShiftTypeAndAmount shift(SRType_LSL, scale);
+        m_assembler.add(dataTempRegister, dataTempRegister, index, shift);
+        jump(dataTempRegister);
+    }
 
     // Miscellaneous operations: