cpuid.h (__cpuid): Remove definitions that handle %ebx register in a special way.

	* config/i386/cpuid.h (__cpuid): Remove definitions that handle %ebx
	register in a special way.
	(__cpuid_count): Ditto.
	* config/i386/driver-i386.h: Protect with
	"#if defined(__GNUC__) && (__GNUC__ >= 5 || !defined(__PIC__))".
	(host_detect_local_cpu): Mention that GCC with non-fixed %ebx
	is required to compile the function.

From-SVN: r216362

gcc/config/i386/cpuid.h

@@ -146,55 +146,6 @@
 #define signature_VORTEX_ecx	0x436f5320
 #define signature_VORTEX_edx	0x36387865
 
-#if defined(__i386__) && defined(__PIC__)
-/* %ebx may be the PIC register.  */
-#if __GNUC__ >= 3
-#define __cpuid(level, a, b, c, d)			\
-  __asm__ ("xchg{l}\t{%%}ebx, %k1\n\t"			\
-	   "cpuid\n\t"					\
-	   "xchg{l}\t{%%}ebx, %k1\n\t"			\
-	   : "=a" (a), "=&r" (b), "=c" (c), "=d" (d)	\
-	   : "0" (level))
-
-#define __cpuid_count(level, count, a, b, c, d)		\
-  __asm__ ("xchg{l}\t{%%}ebx, %k1\n\t"			\
-	   "cpuid\n\t"					\
-	   "xchg{l}\t{%%}ebx, %k1\n\t"			\
-	   : "=a" (a), "=&r" (b), "=c" (c), "=d" (d)	\
-	   : "0" (level), "2" (count))
-#else
-/* Host GCCs older than 3.0 weren't supporting Intel asm syntax
-   nor alternatives in i386 code.  */
-#define __cpuid(level, a, b, c, d)			\
-  __asm__ ("xchgl\t%%ebx, %k1\n\t"			\
-	   "cpuid\n\t"					\
-	   "xchgl\t%%ebx, %k1\n\t"			\
-	   : "=a" (a), "=&r" (b), "=c" (c), "=d" (d)	\
-	   : "0" (level))
-
-#define __cpuid_count(level, count, a, b, c, d)		\
-  __asm__ ("xchgl\t%%ebx, %k1\n\t"			\
-	   "cpuid\n\t"					\
-	   "xchgl\t%%ebx, %k1\n\t"			\
-	   : "=a" (a), "=&r" (b), "=c" (c), "=d" (d)	\
-	   : "0" (level), "2" (count))
-#endif
-#elif defined(__x86_64__) && (defined(__code_model_medium__) || defined(__code_model_large__)) && defined(__PIC__)
-/* %rbx may be the PIC register.  */
-#define __cpuid(level, a, b, c, d)			\
-  __asm__ ("xchg{q}\t{%%}rbx, %q1\n\t"			\
-	   "cpuid\n\t"					\
-	   "xchg{q}\t{%%}rbx, %q1\n\t"			\
-	   : "=a" (a), "=&r" (b), "=c" (c), "=d" (d)	\
-	   : "0" (level))
-
-#define __cpuid_count(level, count, a, b, c, d)		\
-  __asm__ ("xchg{q}\t{%%}rbx, %q1\n\t"			\
-	   "cpuid\n\t"					\
-	   "xchg{q}\t{%%}rbx, %q1\n\t"			\
-	   : "=a" (a), "=&r" (b), "=c" (c), "=d" (d)	\
-	   : "0" (level), "2" (count))
-#else
 #define __cpuid(level, a, b, c, d)			\
   __asm__ ("cpuid\n\t"					\
 	   : "=a" (a), "=b" (b), "=c" (c), "=d" (d)	\
@@ -204,7 +155,7 @@
   __asm__ ("cpuid\n\t"					\
 	   : "=a" (a), "=b" (b), "=c" (c), "=d" (d)	\
 	   : "0" (level), "2" (count))
-#endif
+
 
 /* Return highest supported input value for cpuid instruction.  ext can
    be either 0x0 or 0x8000000 to return highest supported value for

gcc/config/i386/driver-i386.c

@@ -24,7 +24,7 @@ along with GCC; see the file COPYING3.  If not see
 
 const char *host_detect_local_cpu (int argc, const char **argv);
 
-#ifdef __GNUC__
+#if defined(__GNUC__) && (__GNUC__ >= 5 || !defined(__PIC__))
 #include "cpuid.h"
 
 struct cache_desc
@@ -942,9 +942,9 @@ done:
 }
 #else
 
-/* If we aren't compiling with GCC then the driver will just ignore
-   -march and -mtune "native" target and will leave to the newly
-   built compiler to generate code for its default target.  */
+/* If we are compiling with GCC where %EBX register is fixed, then the
+   driver will just ignore -march and -mtune "native" target and will leave
+   to the newly built compiler to generate code for its default target.  */
 
 const char *host_detect_local_cpu (int, const char **)
 {