Detect SSE4.1 support for Subzero.
Bug swiftshader:20
Change-Id: I20c2ab7cb4c00c365520ff8b8500f7594127498b
Reviewed-on: https://swiftshader-review.googlesource.com/8468
Tested-by: Nicolas Capens <capn@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
diff --git a/src/Reactor/SubzeroReactor.cpp b/src/Reactor/SubzeroReactor.cpp
index 0a78f6e..bd23e35 100644
--- a/src/Reactor/SubzeroReactor.cpp
+++ b/src/Reactor/SubzeroReactor.cpp
@@ -57,6 +57,34 @@
Ice::Fdstream *out = nullptr;
}
+namespace
+{
+ class CPUID
+ {
+ public:
+ const static bool SSE4_1;
+
+ private:
+ static void cpuid(int registers[4], int info)
+ {
+ #if defined(_WIN32)
+ __cpuid(registers, info);
+ #else
+ __asm volatile("cpuid": "=a" (registers[0]), "=b" (registers[1]), "=c" (registers[2]), "=d" (registers[3]): "a" (info));
+ #endif
+ }
+
+ static bool detectSSE4_1()
+ {
+ int registers[4];
+ cpuid(registers, 1);
+ return (registers[2] & 0x00080000) != 0;
+ }
+ };
+
+ const bool CPUID::SSE4_1 = CPUID::detectSSE4_1();
+}
+
namespace sw
{
enum EmulatedType
@@ -402,7 +430,7 @@
Flags.setOutFileType(Ice::FT_Elf);
Flags.setOptLevel(Ice::Opt_2);
Flags.setApplicationBinaryInterface(Ice::ABI_Platform);
- Flags.setTargetInstructionSet(Ice::X86InstructionSet_SSE4_1);
+ Flags.setTargetInstructionSet(CPUID::SSE4_1 ? Ice::X86InstructionSet_SSE4_1 : Ice::X86InstructionSet_SSE2);
Flags.setVerbose(false ? Ice::IceV_All : Ice::IceV_None);
static llvm::raw_os_ostream cout(std::cout);
