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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/243989">243989</a></dd>
<dt>Author</dt> <dd>commit-queue@webkit.org</dd>
<dt>Date</dt> <dd>2019-04-08 03:16:22 -0700 (Mon, 08 Apr 2019)</dd>
</dl>

<h3>Log Message</h3>
<pre>[CMake] Detect SSE2 at compile time
https://bugs.webkit.org/show_bug.cgi?id=196488

Patch by Xan Lopez <xan@igalia.com> on 2019-04-08
Reviewed by Carlos Garcia Campos.

.:

* CMakeLists.txt: Use FindSSE2.cmake to detect SSE2 support.
* Source/cmake/FindSSE2.cmake: Added.

Source/JavaScriptCore:

* assembler/MacroAssemblerX86Common.cpp: Remove unnecessary (and
incorrect) static_assert.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkCMakeListstxt">trunk/CMakeLists.txt</a></li>
<li><a href="#trunkChangeLog">trunk/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreChangeLog">trunk/Source/JavaScriptCore/ChangeLog</a></li>
<li><a href="#trunkSourceJavaScriptCoreassemblerMacroAssemblerX86Commoncpp">trunk/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.cpp</a></li>
<li><a href="#trunkSourceJavaScriptCoreassemblerMacroAssemblerX86Commonh">trunk/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.h</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li><a href="#trunkSourcecmakeFindSSE2cmake">trunk/Source/cmake/FindSSE2.cmake</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkCMakeListstxt"></a>
<div class="modfile"><h4>Modified: trunk/CMakeLists.txt (243988 => 243989)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/CMakeLists.txt     2019-04-08 10:15:27 UTC (rev 243988)
+++ trunk/CMakeLists.txt        2019-04-08 10:16:22 UTC (rev 243989)
</span><span class="lines">@@ -114,6 +114,16 @@
</span><span class="cx">     set(WTF_CPU_UNKNOWN 1)
</span><span class="cx"> endif ()
</span><span class="cx"> 
</span><ins>+#---------------------------
+# Make sure SSE2 is present.
+#---------------------------
+if (WTF_CPU_X86)
+    include(FindSSE2)
+    if (NOT SSE2_SUPPORT_FOUND)
+        message(FATAL_ERROR "SSE2 support is required to compile WebKit")
+    endif ()
+endif ()
+
</ins><span class="cx"> # -----------------------------------------------------------------------------
</span><span class="cx"> # Determine the operating system
</span><span class="cx"> # -----------------------------------------------------------------------------
</span></span></pre></div>
<a id="trunkChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/ChangeLog (243988 => 243989)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/ChangeLog  2019-04-08 10:15:27 UTC (rev 243988)
+++ trunk/ChangeLog     2019-04-08 10:16:22 UTC (rev 243989)
</span><span class="lines">@@ -1,3 +1,13 @@
</span><ins>+2019-04-08  Xan Lopez  <xan@igalia.com>
+
+        [CMake] Detect SSE2 at compile time
+        https://bugs.webkit.org/show_bug.cgi?id=196488
+
+        Reviewed by Carlos Garcia Campos.
+
+        * CMakeLists.txt: Use FindSSE2.cmake to detect SSE2 support.
+        * Source/cmake/FindSSE2.cmake: Added.
+
</ins><span class="cx"> 2019-04-05  Commit Queue  <commit-queue@webkit.org>
</span><span class="cx"> 
</span><span class="cx">         Unreviewed, rolling out r243833.
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/ChangeLog (243988 => 243989)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/ChangeLog    2019-04-08 10:15:27 UTC (rev 243988)
+++ trunk/Source/JavaScriptCore/ChangeLog       2019-04-08 10:16:22 UTC (rev 243989)
</span><span class="lines">@@ -1,3 +1,13 @@
</span><ins>+2019-04-08  Xan Lopez  <xan@igalia.com>
+
+        [CMake] Detect SSE2 at compile time
+        https://bugs.webkit.org/show_bug.cgi?id=196488
+
+        Reviewed by Carlos Garcia Campos.
+
+        * assembler/MacroAssemblerX86Common.cpp: Remove unnecessary (and
+        incorrect) static_assert.
+
</ins><span class="cx"> 2019-04-07  Michael Saboff  <msaboff@apple.com>
</span><span class="cx"> 
</span><span class="cx">         REGRESSION (r243642): Crash in reddit.com page
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreassemblerMacroAssemblerX86Commoncpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.cpp (243988 => 243989)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.cpp        2019-04-08 10:15:27 UTC (rev 243988)
+++ trunk/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.cpp   2019-04-08 10:16:22 UTC (rev 243989)
</span><span class="lines">@@ -168,11 +168,6 @@
</span><span class="cx"> static_assert(sizeof(Probe::State) == PROBE_SIZE, "Probe::State::size's matches ctiMasmProbeTrampoline");
</span><span class="cx"> static_assert((PROBE_EXECUTOR_OFFSET + PTR_SIZE) <= (PROBE_SIZE + OUT_SIZE), "Must have room after ProbeContext to stash the probe handler");
</span><span class="cx"> 
</span><del>-#if CPU(X86)
-// SSE2 is a hard requirement on x86.
-static_assert(isSSE2Present(), "SSE2 support is required in JavaScriptCore");
-#endif
-
</del><span class="cx"> #undef PROBE_OFFSETOF
</span><span class="cx"> 
</span><span class="cx"> #if CPU(X86)
</span><span class="lines">@@ -792,7 +787,6 @@
</span><span class="cx">     std::call_once(onceKey, [] {
</span><span class="cx">         {
</span><span class="cx">             CPUID cpuid = getCPUID(0x1);
</span><del>-            s_sse2CheckState = (cpuid[3] & (1 << 26)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear;
</del><span class="cx">             s_sse4_1CheckState = (cpuid[2] & (1 << 19)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear;
</span><span class="cx">             s_sse4_2CheckState = (cpuid[2] & (1 << 20)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear;
</span><span class="cx">             s_popcntCheckState = (cpuid[2] & (1 << 23)) ? CPUIDCheckState::Set : CPUIDCheckState::Clear;
</span><span class="lines">@@ -809,7 +803,6 @@
</span><span class="cx">     });
</span><span class="cx"> }
</span><span class="cx"> 
</span><del>-MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_sse2CheckState = CPUIDCheckState::NotChecked;
</del><span class="cx"> MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_sse4_1CheckState = CPUIDCheckState::NotChecked;
</span><span class="cx"> MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_sse4_2CheckState = CPUIDCheckState::NotChecked;
</span><span class="cx"> MacroAssemblerX86Common::CPUIDCheckState MacroAssemblerX86Common::s_avxCheckState = CPUIDCheckState::NotChecked;
</span></span></pre></div>
<a id="trunkSourceJavaScriptCoreassemblerMacroAssemblerX86Commonh"></a>
<div class="modfile"><h4>Modified: trunk/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.h (243988 => 243989)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.h  2019-04-08 10:15:27 UTC (rev 243988)
+++ trunk/Source/JavaScriptCore/assembler/MacroAssemblerX86Common.h     2019-04-08 10:16:22 UTC (rev 243989)
</span><span class="lines">@@ -4197,41 +4197,11 @@
</span><span class="cx">     }
</span><span class="cx"> #endif
</span><span class="cx"> 
</span><del>-#if CPU(X86)
-#if OS(MAC_OS_X)
-
-    // All X86 Macs are guaranteed to support at least SSE2,
-    static bool isSSE2Present()
-    {
-        return true;
-    }
-
-#else // OS(MAC_OS_X)
-    static bool isSSE2Present()
-    {
-        if (s_sse2CheckState == CPUIDCheckState::NotChecked)
-            collectCPUFeatures();
-        return s_sse2CheckState == CPUIDCheckState::Set;
-    }
-
-#endif // OS(MAC_OS_X)
-#elif !defined(NDEBUG) // CPU(X86)
-
-    // On x86-64 we should never be checking for SSE2 in a non-debug build,
-    // but non debug add this method to keep the asserts above happy.
-    static bool isSSE2Present()
-    {
-        return true;
-    }
-
-#endif
-
</del><span class="cx">     using CPUID = std::array<unsigned, 4>;
</span><span class="cx">     static CPUID getCPUID(unsigned level);
</span><span class="cx">     static CPUID getCPUIDEx(unsigned level, unsigned count);
</span><span class="cx">     JS_EXPORT_PRIVATE static void collectCPUFeatures();
</span><span class="cx"> 
</span><del>-    JS_EXPORT_PRIVATE static CPUIDCheckState s_sse2CheckState;
</del><span class="cx">     JS_EXPORT_PRIVATE static CPUIDCheckState s_sse4_1CheckState;
</span><span class="cx">     JS_EXPORT_PRIVATE static CPUIDCheckState s_sse4_2CheckState;
</span><span class="cx">     JS_EXPORT_PRIVATE static CPUIDCheckState s_avxCheckState;
</span></span></pre></div>
<a id="trunkSourcecmakeFindSSE2cmake"></a>
<div class="addfile"><h4>Added: trunk/Source/cmake/FindSSE2.cmake (0 => 243989)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/cmake/FindSSE2.cmake                                (rev 0)
+++ trunk/Source/cmake/FindSSE2.cmake   2019-04-08 10:16:22 UTC (rev 243989)
</span><span class="lines">@@ -0,0 +1,65 @@
</span><ins>+#################################
+# Check for the presence of SSE2.
+#
+# Once done, this will define:
+# - SSE2_SUPPORT_FOUND - the system supports (at least) SSE2.
+#
+# Copyright (c) 2014, Pablo Fernandez Alcantarilla, Jesus Nuevo
+# Copyright (c) 2019, Igalia S.L.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+#   * Redistributions of source code must retain the above copyright notice,
+#     this list of conditions and the following disclaimer.
+#
+#   * Redistributions in binary form must reproduce the above copyright notice,
+#     this list of conditions and the following disclaimer in the documentation
+#     and/or other materials provided with the distribution.
+#
+#   * Neither the name of the copyright holders nor the names of its contributors
+#     may be used to endorse or promote products derived from this software without
+#     specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+# SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+# BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
+# WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set(SSE2_SUPPORT_FOUND FALSE)
+
+macro(CHECK_FOR_SSE2)
+    include(CheckCXXSourceRuns)
+
+    check_cxx_source_runs("
+        #include <emmintrin.h>
+        int main ()
+        {
+            __m128d a, b;
+            double vals[2] = {0};
+            a = _mm_loadu_pd (vals);
+            b = _mm_add_pd (a,a);
+            _mm_storeu_pd (vals,b);
+            return(0);
+        }"
+        HAVE_SSE2_EXTENSIONS)
+
+    if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANG)
+        if (HAVE_SSE2_EXTENSIONS)
+            set(SSE2_SUPPORT_FOUND TRUE)
+        endif ()
+    elseif (MSVC AND NOT CMAKE_CL_64)
+        if (HAVE_SSE2_EXTENSIONS)
+            set(SSE2_SUPPORT_FOUND TRUE)
+            message(STATUS "Found SSE2 extensions.")
+        endif (HAVE_SSE2_EXTENSIONS)
+    endif ()
+
+endmacro(CHECK_FOR_SSE2)
+
+CHECK_FOR_SSE2()
</ins></span></pre>
</div>
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