GNU Arm Embedded Toolchain

  1. Bug #1738730
  2. Comment #18

Comment 18 for bug 1738730

Revision history for this message
Murat Ursavas (murat-ursavas) wrote : Re: Simple OR'ed assignment breaks the code silently

Hi John,

Thanks for your interest and effort. I appreciate it. By the way, I've checked the output with 5.2 and the result is the same.

And here's the 4.9 output:

 ldr r3, .L2
 ldr r3, [r3]
 ldrh r2, [r3] @ movhi
 movs r2, #0
 strh r2, [r3] @ movhi
 mov sp, r7

Another boring thing, there is a redundant nop instruction before popping sp, in 5,6 and 7 versions. I don't know the necessity.

For me, the most suspicious thing is the addition of ARM-v8 architec. This is the major change for the 5. Even though the change is announced in 4.7, I've seen significant changes in 5.2 comparing to 4.9. Maybe mixing 64bit logic with 32bit logic could have an effect on this issue. Who knows? (Definitely not me :)

Regards,