The current implementation of vector instruction emulation in loongarch
target works illy on big endianness hosts. It can be reproduced using
the test cases from gcc [1]. One can cross-compile the target
loongarch64-linux-user for s390x and use qemu-s390x to run the compiled
qemu to test loongarch64 emulation on big endian hosts.

Possible reproduce steps are:

1. Install s390x cross toolchains and qemu-s390x
2. Compile qemu using ./configure --target-list=loongarch64-linux-user --cross-prefix=s390x-linux-gnu-
3. Install loongarch64 cross toolchains to compile the test cases. To
   get an accurate result, the test cases should be compiled using -O0.
   To make the error output of the test cases readable and meaningful,
   printf() should be replaced with a version without any vectorization
   optimizations, since the endianness problems will prevent printf()
   with lsx optimizations from working correctly
4. Use qemu-s390x ./qemu-loongarch64 /path/to/test_case.exe to test the
   cases on big endianness hosts.

With this patch series, all the tests in [1] can pass.

[1]: under gcc/testsuite/gcc.target/loongarch/vector in the gcc source

Signed-off-by: Miao Wang <shankerwangmiao@gmail.com>
---
Miao Wang (6):
      target/loongarch: make VReg aligned to 16 bytes
      target/loongarch: Fix offset calculation in vector registers
      target/loongarch: gen_vreplve: Fix offset calculation
      target/loongarch: gen_xvreplve0: Fix elem0 offset calculation
      target/loongarch: do_vldrepl_vl: Fix endianness when reading from guest memory
      target/loongarch: vstelm: Fix reading from vector registers

 target/loongarch/cpu.h                          |  2 +-
 target/loongarch/tcg/insn_trans/trans_vec.c.inc | 39 +++++++++++++------------
 target/loongarch/tcg/translate.c                |  6 ++--
 3 files changed, 25 insertions(+), 22 deletions(-)
---
base-commit: 30e8a06b64aa58a3990ba39cb5d09531e7d265e0
change-id: 20260701-loong64-be-adf8a15675f1

Best regards,
-- 
Miao Wang <shankerwangmiao@gmail.com>