Compiler/AM1808: Assembler bug

42Bastian

Part Number: AM1808

Tool/software: TI C/C++ Compiler

It seems the assembler does not allow to compile a valid instruction in thumb mode:

 sub sp,#40

It issues "Register Rd cannot be a hi register"
But ARM ARM lists:

SUB  SP, #imm * 4
where: 
SP Indicates the stack pointer. The result of the operation is also stored in the SP.
 imm is a 7-bit immediate value that is multiplied by 4 and then subtracted from the value 
of the stack pointer.

I checked 18.12.5-LTS and 16.9.11.

over 4 years ago

0 42Bastian over 4 years ago

Expert 1420 points

Test case:

; tibug.asm
	.thumb
	.thumbfunc test
test:
	sub	sp,#12

armcl -c --code_state=16 -mv5e tibug.asm

0 George Mock over 4 years ago in reply to 42Bastian

TI__Guru**** 239845 points

Thank you for notifying us of this problem, and for providing a concise test case. I can reproduce the same behavior. I filed the entry EXT_EP-9949 to have this investigated. You are welcome to follow it with the link below in my signature.

As a workaround, you can write instead ...

       add     sp,#-12

Thanks and regards,

-George

0 Archaeologist over 4 years ago

TI__Guru* 84225 points

Try the official syntax:

SUB SP, SP, #n

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Compiler/AM1808: Assembler bug