Hello, currently, clang refuses to compile jb,pt (x86_64/mod_34lsub1.asm) (it understands jb without ,pt) and Oracle refuses movzb (x86_64/gcd_1.asm) (it knows the ...w and ...l versions though). Are those horrible bugs that should absolutely be reported to the compiler vendors, or are there more portable versions of the instructions? -- Marc Glisse