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symbolic names for processor IDs
- From: Ulrich Drepper <drepper at gmail dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Fri, 7 Sep 2012 21:45:32 -0400
- Subject: symbolic names for processor IDs
The x86 cpuid instruction returns a processor ID and the
__get_cpuid_max function even explicitly makes the %ebx value directly
available. But users of that function have to use a cryptic constant.
How about adding a few macros to make this more transparent?
Index: gcc/config/i386/cpuid.h
===================================================================
--- gcc/config/i386/cpuid.h (revision 191084)
+++ gcc/config/i386/cpuid.h (working copy)
@@ -75,6 +75,16 @@
#define bit_RDSEED (1 << 18)
#define bit_ADX (1 << 19)
+/* Signatures for different CPU implementations as returned in uses
+ of cpuid with level 0. */
+#define signature_INTEL_ebx 0x756e6547
+#define signature_INTEL_ecx 0x6c65746e
+#define signature_INTEL_edx 0x49656e69
+
+#define signature_AMD_ebx 0x68747541
+#define signature_AMD_ecx 0x444d4163
+#define signature_AMD_edx 0x69746e65
+
#if defined(__i386__) && defined(__PIC__)
/* %ebx may be the PIC register. */
#if __GNUC__ >= 3