Beginner Help

[coco2]

I don't know a lot about ASM and have started to learn out of curiosity. Why does this work:

Code: Select all

x.q = 10
n.q = 2
d.q = 0
! MOV rax, [v_x]
! MOV rcx, [v_n]
! CQO
! IDIV rcx
! MOV [v_d], rax
Debug d

But this does not:

Code: Select all

x.q = 10
n.q = 2
d.q = 0
EnableASM
  MOV rax, [v_x]
  MOV rcx, [v_n]
  CQO
  IDIV rcx
  MOV [v_d], rax
DisableASM
Debug d

[normeus]

just add an exclamation in front !

Code: Select all

x.q = 10
n.q = 2
d.q = 0
EnableASM
  MOV rax, [v_x]
  MOV rcx, [v_n]
  !CQO
  IDIV rcx
  MOV [v_d], rax
DisableASM
Debug d

It has to do with it being a newer opcode, as explained by Luis here:

viewtopic.php?p=532368#p532368

Norm.

[coco2]

Thank you, it makes sense

[juergenkulow]

Problem with 128 bit registers (XMM)

I didn't upated the asm since a while (means about 20 years) so it's expected it didn't work as expected.