x86cpuid.pl: make it work with older CPUs.

PR: 3005
(cherry picked from commit 5702e965d759dde8a098d8108660721ba2b93a7d)

diff --git a/crypto/x86cpuid.pl b/crypto/x86cpuid.pl
index a7464af19b771d48aca8b3669e827ff843d29c82..201df910781a86cea663ada56bb2bd3c2ec08f17 100644 (file)
--- a/crypto/x86cpuid.pl
+++ b/crypto/x86cpuid.pl
@@ -60,6 +60,7 @@ for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
        &inc    ("esi");                # number of cores
 
        &mov    ("eax",1);
+       &xor    ("ecx","ecx");
        &cpuid  ();
        &bt     ("edx",28);
        &jnc    (&label("done"));
@@ -84,6 +85,7 @@ for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
 
 &set_label("nocacheinfo");
        &mov    ("eax",1);
+       &xor    ("ecx","ecx");
        &cpuid  ();
        &cmp    ("ebp",0);
        &jne    (&label("notP4"));