Changeset 37991 in webkit for trunk/JavaScriptCore/masm

Timestamp:

Oct 29, 2008, 9:33:21 PM (17 years ago)

Author:

[email protected]

Message:

Initial work to reduce cost of JSNumberCell allocation

Reviewed by Geoffrey Garen

This does the initial work needed to bring more of number
allocation into CTI code directly, rather than just falling
back onto the slow paths if we can't guarantee that a number
cell can be reused.

Initial implementation only used by op_negate to make sure
it all works. In a negate heavy (though not dominated) test
it results in a 10% win in the non-reusable cell case.

File:

• trunk/JavaScriptCore/masm/X86Assembler.h (modified) (4 diffs)

trunk/JavaScriptCore/masm/X86Assembler.h

@@ -229 +229 @@
         OP2_CVTTSD2SI_GdWsd = 0x2C,
         OP2_UCOMISD_VsdWsd  = 0x2E,
+        OP2_XORPD_VsdWsd    = 0x57,
         OP2_ADDSD_VsdWsd    = 0x58,
         OP2_MULSD_VsdWsd    = 0x59,
@@ -264 +265 @@
 
         GROUP3_OP_TEST = 0,
+        GROUP3_OP_NEG  = 3,
         GROUP3_OP_IDIV = 7,
 
@@ -606 +608 @@
     }
 
+    void negl_r(RegisterID dst)
+    {
+        m_buffer->putByte(OP_GROUP3_Ev);
+        emitModRm_opr(GROUP3_OP_NEG, dst);
+    }
+
     void cdq()
     {
@@ -740 +748 @@
         m_buffer->putByte(OP2_MOVSD_VsdWsd);
         emitModRm_rm((RegisterID)dst, base, offset);
+    }
+
+    void xorpd_mr(void* addr, XMMRegisterID dst)
+    {
+        m_buffer->putByte(PRE_SSE_66);
+        m_buffer->putByte(OP_2BYTE_ESCAPE);
+        m_buffer->putByte(OP2_XORPD_VsdWsd);
+        emitModRm_rm((RegisterID)dst, addr);
     }