[llvm-bugs] [Bug 43384] New: AVR llvm-mc tests fail on big-endian (s390x) hosts

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https://bugs.llvm.org/show_bug.cgi?id=43384

            Bug ID: 43384
           Summary: AVR llvm-mc tests fail on big-endian (s390x) hosts
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AVR
          Assignee: me at dylanmckay.io
          Reporter: tstellar at redhat.com
                CC: llvm-bugs at lists.llvm.org, sguelton at redhat.com

The AVR llvm-mc tests are failing on s390x, because the encoding information
for the instructions are missing.  The root cause is the byte swapping that the
AVRMCCodeEmitter::emitInstruction() function does.

Why is it necessary to swap the bytes like this?

Here is an example failure:

********************
FAIL: LLVM :: MC/AVR/syntax-reg-pair.s (22490 of 32518)
******************** TEST 'LLVM :: MC/AVR/syntax-reg-pair.s' FAILED
********************
Script:
--
: 'RUN: at line 1';   /root/llvm-project/llvm-build/bin/llvm-mc -triple avr
-mattr=addsubiw -show-encoding <
/root/llvm-project/llvm/test/MC/AVR/syntax-reg-pair.s |
/root/llvm-project/llvm-build/bin/FileCheck
/root/llvm-project/llvm/test/MC/AVR/syntax-reg-pair.s
--
Exit Code: 1

Command Output (stderr):
--
/root/llvm-project/llvm/test/MC/AVR/syntax-reg-pair.s:10:10: error: CHECK:
expected string not found in input
; CHECK: sbiw r24, 1 ; encoding: [0x01,0x97]
         ^
<stdin>:1:2: note: scanning from here
 .text
 ^
<stdin>:5:2: note: possible intended match here
 sbiw r24, 1 ; encoding: [0x00,0x00]
 ^

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