Displaying 3 results from an estimated 3 matches for "ch03s03s01".
2019 Apr 14
2
[A bug?] Failed to use BuildMI to add R7 - R12 registers for tADDi8 and tPUSH of ARM
Sorry for not being specific enough. ARMv7-M includes Thumb and Thumb2.
It has 12 regular registers (R0 - R12), and R8 - R12 are used.
I can generate mov instruction that from/ R8-R12 to/from R0-R6.
From this ARM page http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0068b/ch03s03s01.html
R9 - R12 have their conventional usage, but I don’t if this is the reason we cannot
use them arbitrarily. The fact that we can use it to generate mov instructions but
not add/sub and push/pop confuses me.
- Jie
On Apr 14, 2019, at 14:55, Craig Topper <craig.topper at gmail.com<mailto:c...
2019 Apr 14
2
[A bug?] Failed to use BuildMI to add R7 - R12 registers for tADDi8 and tPUSH of ARM
...;> wrote:
Sorry for not being specific enough. ARMv7-M includes Thumb and Thumb2.
It has 12 regular registers (R0 - R12), and R8 - R12 are used.
I can generate mov instruction that from/ R8-R12 to/from R0-R6.
From this ARM page http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0068b/ch03s03s01.html<https://urldefense.proofpoint.com/v2/url?u=http-3A__infocenter.arm.com_help_index.jsp-3Ftopic-3D_com.arm.doc.dui0068b_ch03s03s01.html&d=DwMFaQ&c=kbmfwr1Yojg42sGEpaQh5ofMHBeTl9EI2eaqQZhHbOU&r=KAtyTEI8n3FritxDpKpR7rv3VjdmUs0luiVKZLb_bNI&m=_fpYL_7E5zOQ4DZeiPmiSOgKp7KxZ5mAZVh9wB...
2019 Apr 14
3
[A bug?] Failed to use BuildMI to add R7 - R12 registers for tADDi8 and tPUSH of ARM
Hi all,
I’m trying to insert some add/sub and push/pop instructions in a MachineFunction pass for ARMv7-M. However, I encountered something weird.
For an add, when I use
BuildMI(….., TII->get(ARM::tADDi8), reg).addReg(reg).addReg(reg).addImm(imm).
if reg is R0 - R7, everything is fine: I would get something like
adds r1, 4
But if I use R8 - R12 as the reg in the BuildMI, I wouldn’t get