Bug in ARM 15.12.3.LTS and 16.6.0.STS

42Bastian

Following code compiles fine with 5.2.x and throws a warning on 15.12.3 and 16.x


	.sect ".text_krn"
	.thumb
	.thumbfunc hello
hello:
	movs	r0,#-0xffffffff
	.end

Why this?

over 8 years ago

0 42Bastian over 8 years ago

Expert 1420 points

Here the warning issued by 16.6.0.STS:


"x.asm", WARNING! at line 5: [W0001] Constant value out of range, will be
                                     truncated to 32 bits

0 George Mock over 8 years ago in reply to 42Bastian

TI__Guru**** 239845 points

Thank you for reporting this problem, and supplying a well defined test case. I can reproduce the problem. I filed CODEGEN-1547 in the SDOWP system to have this investigated. You are welcome to follow it with the SDOWP link below in my signature.

Thanks and regards,

-George

0 42Bastian over 8 years ago in reply to George Mock

Expert 1420 points

George, the SDOWP lists only 15.12.3.LTS, but 16.6.0.STS contains the same bug.

0 Archaeologist over 8 years ago

TI__Guru* 84225 points

Out of curiosity, why not write that operand as "#1"?

0 George Mock over 8 years ago in reply to 42Bastian

TI__Guru**** 239845 points

42Bastian said:
the SDOWP lists only 15.12.3.LTS, but 16.6.0.STS contains the same bug.

I updated the record.

Thanks and regards,

-George

0 42Bastian over 8 years ago in reply to Archaeologist

Expert 1420 points

The original code is from our kernel and is


movs r0,#-SC_ENDLESS_TMO

And SC_ENDLESS_TMO is defined as 0xffffffff.

0 42Bastian over 7 years ago in reply to George Mock

Expert 1420 points

15.12.4.LTS contains still this bug ... :(

0 42Bastian over 7 years ago in reply to George Mock

Expert 1420 points

Following the SDOWP, it seems the "error" will not be fixed. If 64 bit arithmetic is used by default, there should be a switch to go back to 32 bit.

0 42Bastian over 7 years ago in reply to George Mock

Expert 1420 points

Ok, using: (expression)&0xffffffff solves this issue for now...

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Bug in ARM 15.12.3.LTS and 16.6.0.STS