llvm dev - Apr 2017 - Error compiling newlib for ARM with the integrated assembler

I'm working on compiling newlib with LLVM.  The target that I'm using is
arm-none-eabi.   I'm running into an error with compiling strlen
(newlib/libc/machine/arm/strlen.S).

strlen.s:4:19: error: invalid operand for instruction
 ldrb.w r2, [r3], #1

The test case looks like this (reduced):

.arch armv7
 .thumb
 .syntax unified
 ldrb.w r2, [r3], #1

This assembles fine, if I remove the width modifier (.w) from the ldrb
instruction.  It also accepts ldrb.n without a problem.  Given that this
instruction should default to a width of 32 bits, is there any reason why we
can't accept the .w modifier?   If such a change is acceptable, I will
prepare a patch.  Any pointers to where such a patch should be implemented,
would also be appreciated.

Thanks,
Catherine

Hi Catherine,

On 6 April 2017 at 11:02, Moore, Catherine <Catherine_Moore at mentor.com>
wrote:
> This assembles fine, if I remove the width modifier (.w) from the ldrb
instruction.  It also accepts ldrb.n without a problem.  Given that this
instruction should default to a width of 32 bits, is there any reason why we
can't accept the .w modifier?
This definitely sounds like a bug. We should reject .n and accept .w.
Thanks for working on the issue.

Tim.