quoted

+static bool x86__ins_is_fused(struct arch *arch, const char *ins1,
+			      const char *ins2)
+{
+	if (strstarts(arch->vendor, "AuthenticAMD"))
+		return amd__ins_is_fused(arch, ins1, ins2);
+
+	return intel__ins_is_fused(arch, ins1, ins2);
+}
+

Can we instead make x86__ins_is_fused be a pointer and instead of
storing arch->vendor we set it to one of amd__ins_is_fused() or
intel__ins_is_fused()?

I.e. here:

quoted

 static int x86__cpuid_parse(struct arch *arch, char *cpuid)
 {
 	unsigned int family, model, stepping;

@@ -184,6 +216,9 @@ static int x86__cpuid_parse(struct arch *arch, char *cpuid)
 	if (ret == 3) {
 		arch->family = family;
 		arch->model = model;
+		arch->vendor = strndup(cpuid, 12);

		x86__ins_is_fused = strstarts(cpuid, "AuthenticAMD") ?
					amd__ins_is_fused :
					intel__ins_is_fused;

Sure. Will post v2.

Thanks for the review Arnaldo,
Ravi