On Sat, Jan 04, 2014 at 08:50:36PM +0100, Sławomir Wojtasiak wrote: > Hello, > > I have probably found a bug in GAS assembler/disassembler. It looks like the > following instructions are just inverted: > > Every Intel like assembler/disassembler I have already tested, encodes it > like this: > DC F9 fdiv st(1),st > DC F1 fdivr st(1),st > > This is expected behaviour taking into account Intel manual. > > In case of GAS: > > 0xdc, 0xf9 fdivr %st,%st(1) > 0xdc, 0xf1 fdiv %st,%st(1) > > Instructions are inverted. As you can see, fdivr instruction has been used > in the place where Intel used fdiv. This problem exists only for this > specific addressing mode: > > DC F8+i FDIV ST(i), ST(0) > DC F0+i FDIVR ST(i), ST(0)
See the comment at the start of include/opcode/i386.h -- Alan Modra Australia Development Lab, IBM _______________________________________________ bug-binutils mailing list bug-binutils@gnu.org https://lists.gnu.org/mailman/listinfo/bug-binutils
