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
git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37406 268f45cc-cd09-0410-ab3c-d52691b4dbfc
diff --git a/JavaScriptCore/VM/CTI.h b/JavaScriptCore/VM/CTI.h
index b79e5ec..d27a88e 100644
--- a/JavaScriptCore/VM/CTI.h
+++ b/JavaScriptCore/VM/CTI.h
@@ -107,12 +107,24 @@
struct VoidPtrPair { void* first; void* second; };
- typedef JSValue* (*CTIHelper_j)(CTI_ARGS);
- typedef JSPropertyNameIterator* (*CTIHelper_p)(CTI_ARGS);
- typedef void (*CTIHelper_v)(CTI_ARGS);
- typedef void* (*CTIHelper_s)(CTI_ARGS);
- typedef int (*CTIHelper_b)(CTI_ARGS);
- typedef VoidPtrPair (*CTIHelper_2)(CTI_ARGS);
+#if COMPILER(MSVC)
+
+#if USE(FAST_CALL_CTI_ARGUMENT)
+#define SFX_CALL __fastcall
+#else
+#define SFX_CALL __cdecl
+#endif
+
+#else
+#define SFX_CALL
+#endif
+
+ typedef JSValue* (SFX_CALL *CTIHelper_j)(CTI_ARGS);
+ typedef JSPropertyNameIterator* (SFX_CALL *CTIHelper_p)(CTI_ARGS);
+ typedef void (SFX_CALL *CTIHelper_v)(CTI_ARGS);
+ typedef void* (SFX_CALL *CTIHelper_s)(CTI_ARGS);
+ typedef int (SFX_CALL *CTIHelper_b)(CTI_ARGS);
+ typedef VoidPtrPair (SFX_CALL *CTIHelper_2)(CTI_ARGS);
struct CallRecord {
X86Assembler::JmpSrc from;
@@ -250,7 +262,9 @@
// will compress the displacement, and we may not be able to fit a repatched offset.
static const int repatchGetByIdDefaultOffset = 256;
-#if USE(CTI_ARGUMENT)
+#if USE(FAST_CALL_CTI_ARGUMENT)
+ static const int ctiArgumentInitSize = 2;
+#elif USE(CTI_ARGUMENT)
static const int ctiArgumentInitSize = 4;
#else
static const int ctiArgumentInitSize = 0;
