+
+/**
+ * @sa cpuid.h included in gcc-4.4 onwards.
+ * @sa http://msdn.microsoft.com/en-us/library/hskdteyh%28v=vs.90%29.aspx
+ */
+static INLINE void
+cpuid_count(uint32_t ax, uint32_t cx, uint32_t *p)
+{
+#if (defined(PIPE_CC_GCC) || defined(PIPE_CC_SUNPRO)) && defined(PIPE_ARCH_X86)
+ __asm __volatile (
+ "xchgl %%ebx, %1\n\t"
+ "cpuid\n\t"
+ "xchgl %%ebx, %1"
+ : "=a" (p[0]),
+ "=S" (p[1]),
+ "=c" (p[2]),
+ "=d" (p[3])
+ : "0" (ax), "2" (cx)
+ );
+#elif (defined(PIPE_CC_GCC) || defined(PIPE_CC_SUNPRO)) && defined(PIPE_ARCH_X86_64)
+ __asm __volatile (
+ "cpuid\n\t"
+ : "=a" (p[0]),
+ "=b" (p[1]),
+ "=c" (p[2]),
+ "=d" (p[3])
+ : "0" (ax), "2" (cx)
+ );
+#elif defined(PIPE_CC_MSVC)
+ __cpuidex(p, ax, cx);
+#else
+ p[0] = 0;
+ p[1] = 0;
+ p[2] = 0;
+ p[3] = 0;
+#endif
+}
+
+
+static INLINE uint64_t xgetbv(void)
+{
+#if defined(PIPE_CC_GCC)
+ uint32_t eax, edx;
+
+ __asm __volatile (
+ ".byte 0x0f, 0x01, 0xd0" // xgetbv isn't supported on gcc < 4.4
+ : "=a"(eax),
+ "=d"(edx)
+ : "c"(0)
+ );
+
+ return ((uint64_t)edx << 32) | eax;
+#elif defined(PIPE_CC_MSVC) && defined(_MSC_FULL_VER) && defined(_XCR_XFEATURE_ENABLED_MASK)
+ return _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
+#else
+ return 0;
+#endif
+}
+
+
+#if defined(PIPE_ARCH_X86)
+static INLINE boolean sse2_has_daz(void)
+{
+ struct {
+ uint32_t pad1[7];
+ uint32_t mxcsr_mask;
+ uint32_t pad2[128-8];
+ } PIPE_ALIGN_VAR(16) fxarea;
+
+ fxarea.mxcsr_mask = 0;
+#if (defined(PIPE_CC_GCC) || defined(PIPE_CC_SUNPRO))
+ __asm __volatile ("fxsave %0" : "+m" (fxarea));
+#elif (defined(PIPE_CC_MSVC) && _MSC_VER >= 1700) || defined(PIPE_CC_ICL)
+ /* 1700 = Visual Studio 2012 */
+ _fxsave(&fxarea);
+#else
+ fxarea.mxcsr_mask = 0;
+#endif
+ return !!(fxarea.mxcsr_mask & (1 << 6));
+}
+#endif
+