Changeset 37406 in webkit for trunk/JavaScriptCore/masm/X86Assembler.h

Timestamp:

Oct 7, 2008, 9:56:38 PM (17 years ago)

Author:

[email protected]

Message:

Switch CTI runtime calls to the fastcall calling convention

Reviewed by Cameron Zwarich

Basically this means that we get to store the argument for CTI
calls in the ECX register, which saves a register->memory write
and subsequent memory->register read.

This is a 1.7% progression in SunSpider and 2.4% on commandline
v8 tests on Windows

File:

• trunk/JavaScriptCore/masm/X86Assembler.h (modified) (1 diff)

trunk/JavaScriptCore/masm/X86Assembler.h

@@ -1056 +1056 @@
     void emitRestoreArgumentReference()
     {
+#if USE(FAST_CALL_CTI_ARGUMENT)
+        movl_rr(X86::esp, X86::ecx);
+#else
         movl_rm(X86::esp, 0, X86::esp);
+#endif
+    }
+
+    void emitRestoreArgumentReferenceForTrampoline()
+    {
+#if USE(FAST_CALL_CTI_ARGUMENT)
+        movl_rr(X86::esp, X86::ecx);
+        addl_i32r(4, X86::ecx);
+#else
+#endif
     }
 #else
     void emitConvertToFastCall() {};
     void emitRestoreArgumentReference() {};
+    void emitRestoreArgumentReferenceForTrampoline() {};
 #endif