------- Comment #45 from jakub at gcc dot gnu dot org 2009-05-16 06:37 ------- cmpl $1, %eax does have the modrm byte: 83 f8 01 cmp $0x1,%eax compared to cmpl $0xdeadbeef, $eax which doesn't have it: 3d ef be ad de cmp $0xdeadbeef,%eax So I think what I wrote is more precise. modrm byte is there if the insn has ax_reg_operand destination and immediate source which hasn't been shortened.
-- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39942
