x86cpuid.pl: make it work with older CPUs.

PR: 3005

diff --git a/crypto/x86cpuid.pl b/crypto/x86cpuid.pl
index 3b6c469d082613eec9e2078c859cc87277035156..e8a75181afce09206f72fd82bb77db5f7b1493ab 100644 (file)
--- a/crypto/x86cpuid.pl
+++ b/crypto/x86cpuid.pl
@@ -69,6 +69,7 @@ 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("generic"));
@@ -102,6 +103,7 @@ for (@ARGV) { $sse2=1 if (/-DOPENSSL_IA32_SSE2/); }
 
 &set_label("nocacheinfo");
        &mov    ("eax",1);
+       &xor    ("ecx","ecx");
        &cpuid  ();
        &and    ("edx",0xbfefffff);     # force reserved bits #20, #30 to 0
        &cmp    ("ebp",0);