[Mesa-dev] [PATCH 19/21] swr/rast: Use new processor detection mechanism

[George Kyriazis]

Use specific avx512 selection mechanism based on avx512er bit instead of
getHostCPUName().  LLVM 6.0.0 has a bug that reports wrong string for KNL
(fixed in 6.0.1).
---
 .../drivers/swr/rasterizer/jitter/JitManager.cpp   | 50 +++++++++++++++++++++-
 .../drivers/swr/rasterizer/jitter/JitManager.h     |  2 +
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/swr/rasterizer/jitter/JitManager.cpp b/src/gallium/drivers/swr/rasterizer/jitter/JitManager.cpp
index 3b4c3f5..28aadc6 100644
--- a/src/gallium/drivers/swr/rasterizer/jitter/JitManager.cpp
+++ b/src/gallium/drivers/swr/rasterizer/jitter/JitManager.cpp
@@ -80,7 +80,55 @@ JitManager::JitManager(uint32_t simdWidth, const char *arch, const char* core)
 
     StringRef hostCPUName;
 
-    hostCPUName = sys::getHostCPUName();
+    // force JIT to use the same CPU arch as the rest of swr
+    if(mArch.AVX512F())
+    {
+#if USE_SIMD16_SHADERS
+        if(mArch.AVX512ER())
+        {
+            hostCPUName = StringRef("knl");
+        }
+        else
+        {
+            hostCPUName = StringRef("skylake-avx512");
+        }
+        mUsingAVX512 = true;
+#else
+        hostCPUName = StringRef("core-avx2");
+#endif
+        if (mVWidth == 0)
+        {
+            mVWidth = 8;
+        }
+    }
+    else if(mArch.AVX2())
+    {
+        hostCPUName = StringRef("core-avx2");
+        if (mVWidth == 0)
+        {
+            mVWidth = 8;
+        }
+    }
+    else if(mArch.AVX())
+    {
+        if (mArch.F16C())
+        {
+            hostCPUName = StringRef("core-avx-i");
+        }
+        else
+        {
+            hostCPUName = StringRef("corei7-avx");
+        }
+        if (mVWidth == 0)
+        {
+            mVWidth = 8;
+        }
+    }
+    else
+    {
+        SWR_INVALID("Jitting requires at least AVX ISA support");
+    }
+
 
     auto optLevel = CodeGenOpt::Aggressive;
 
diff --git a/src/gallium/drivers/swr/rasterizer/jitter/JitManager.h b/src/gallium/drivers/swr/rasterizer/jitter/JitManager.h
index c15e0d1..54a25d8 100644
--- a/src/gallium/drivers/swr/rasterizer/jitter/JitManager.h
+++ b/src/gallium/drivers/swr/rasterizer/jitter/JitManager.h
@@ -69,6 +69,7 @@ public:
 
     bool AVX2(void) { return bForceAVX ? 0 : InstructionSet::AVX2(); }
     bool AVX512F(void) { return (bForceAVX | bForceAVX2) ? 0 : InstructionSet::AVX512F(); }
+    bool AVX512ER(void) { return (bForceAVX | bForceAVX2) ? 0 : InstructionSet::AVX512ER(); }
     bool BMI2(void) { return bForceAVX ? 0 : InstructionSet::BMI2(); }
 
 private:
@@ -142,6 +143,7 @@ struct JitManager
 
     uint32_t                mVWidth;
 
+    bool                    mUsingAVX512 = false;
 
     // fetch shader types
     llvm::FunctionType*     mFetchShaderTy;
-- 
2.7.4