#include <inttypes.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <sys/wait.h>
#include "crc32c.h"
/*
* Volume 2A: Instruction Set Reference, A-M
*/
-#ifdef ARCH_HAVE_SSE
+bool crc32c_intel_available = false;
+
+#ifdef ARCH_HAVE_SSE4_2
#if BITS_PER_LONG == 64
#define REX_PRE "0x48, "
#define SCALE_F 4
#endif
-uint32_t crc32c_intel_le_hw_byte(uint32_t crc, unsigned char const *data,
- unsigned long length)
+static bool crc32c_probed;
+
+static uint32_t crc32c_intel_le_hw_byte(uint32_t crc, unsigned char const *data,
+ unsigned long length)
{
while (length--) {
__asm__ __volatile__(
return crc;
}
-#endif /* ARCH_HAVE_SSE */
+void crc32c_intel_probe(void)
+{
+ if (!crc32c_probed) {
+ unsigned int eax, ebx, ecx = 0, edx;
+
+ eax = 1;
+ do_cpuid(&eax, &ebx, &ecx, &edx);
+ crc32c_intel_available = (ecx & (1 << 20)) != 0;
+ crc32c_probed = true;
+ }
+}
+
+#endif /* ARCH_HAVE_SSE */