[Bug target/82445] ARM target generates unaligned STRD instruction

[petrcvekcz at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82445

Petr Cvek <petrcvekcz at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |petrcvekcz at gmail dot com

--- Comment #5 from Petr Cvek <petrcvekcz at gmail dot com> ---
Get the same bug with: gcc version 7.1.0 (crosstool-NG
crosstool-ng-1.23.0-88-gfae66ae3) 

Bug free version: gcc version 6.3.0 (crosstool-NG
crosstool-ng-1.22.0-452-gc7b1e295) 

Testing program: just main() with "helloworld" calling the example code
(strd.c) compiled as object file.

march/mtune combinations which are OK:

-march=armv5te -mtune=xscale
-march=armv5te -mtune=iwmmxt
-march=iwmmxt
-march=armv5t (actually less opcodes than variants above)
-march=armv5

march/mtune combinations which generate an unaligned access in STRD (even with
-mno-unaligned-access):

-march=armv5te (tested on a real HW, generating alignment exceptions in
/proc/cpu/alignment)
-march=armv5tej (not existing on gcc 6.3.0)
-march=armv5te -mtune=arm1020e
-march=armv5te -mtune=arm926ej-s