Compiler/DRA829V: SDIV instruction gives "illegal mnumonic error"

Rizwan Ahmad

Part Number: DRA829V

Tool/software: TI C/C++ Compiler

Hi,

I am trying to generate a divide-by-zero exception with following code:

__asm("    mov r0, #0 ");
__asm("    sdiv {r0}, r0, r0 ");

But I get the following error from ti-arm:

[E0002] Illegal mnemonic specified
sdiv {r0}, r0, r0

Please let me know how can I fix this issue.

thanks,
Rizwan

over 5 years ago

0 Rizwan Ahmad over 5 years ago

Intellectual 676 points

Compiler flags:

-mv7R5 --code_state=32 --float_support=none -Ooff -g --diag_warning=225 --diag_wrap=off --display_error_number --endian=little

I have tried adding spaces in the beginning and after the "sdiv", nothing seems to work.

0 Rizwan Ahmad over 5 years ago in reply to Rizwan Ahmad

Intellectual 676 points

ARM manual snap shot attached:

is it because ti-arm does not support this instruction for R5? If so, what would be the replacement?

0 Rizwan Ahmad over 5 years ago in reply to Rizwan Ahmad

Intellectual 676 points

The issue is resolved:

Use UDF #0 instruction because it is supported in A32 and triggers an UNDEF exception. Which was the reason I was trying with div by zero.

0 George Mock over 5 years ago in reply to Rizwan Ahmad

TI__Guru**** 251010 points

The SDIV instruction, when building for Cortex-R5, is only accepted in Thumb mode. That is, change --code_state=32 to --code_state=16.

Thanks and regards,

-George

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Compiler/DRA829V: SDIV instruction gives "illegal mnumonic error"