Changeset 41022 in webkit

Timestamp:

Feb 16, 2009, 2:15:40 PM (17 years ago)

Author:

[email protected]

Message:

Bug 23787: Allow JIT to generate SSE2 code if using GCC
<​https://bugs.webkit.org/show_bug.cgi?id=23787>

Provided by Csaba Osztrogonac
Reviewed by Oliver Hunt

GCC version of the cpuid check.

Location:

trunk/JavaScriptCore

Files:

• ChangeLog (modified) (1 diff)
• jit/JITArithmetic.cpp (modified) (1 diff)

trunk/JavaScriptCore/ChangeLog

@@ +1 @@
+2009-02-16  Csaba Osztrogonac  <[email protected]>
+
+        Reviewed by Oliver Hunt.
+
+        Bug 23787: Allow JIT to generate SSE2 code if using GCC
+        <https://bugs.webkit.org/show_bug.cgi?id=23787>
+
+        GCC version of the cpuid check.
+
+        * jit/JITArithmetic.cpp:
+        (JSC::isSSE2Present): GCC assembly code added.
+        6.6% progression on x86 Linux with JIT and WREC on SunSpider if using SSE2 capable machine.
+
 2009-02-13  Adam Treat  <[email protected]>
 

trunk/JavaScriptCore/jit/JITArithmetic.cpp

@@ -622 +622 @@
                 mov flags, edx;
             }
+#elif COMPILER(GCC)
+            asm (
+                "movl $0x1, %%eax;"
+                "cpuid;"
+                "movl %%edx, %0;"
+                : "=g" (flags)
+                :
+                : "%eax", "%ebx", "%ecx", "%edx"
+            );
 #else
             flags = 0;
-            // FIXME: Add GCC code to do above asm
 #endif
             present = (flags & SSE2FeatureBit) != 0;