target/i386/emulate/x86_decode: Fix compiler warning

When compiling for i386-softmmu under MSYS2, GCC emits the following warning: In function 'get_reg_val', inlined from 'calc_modrm_operand64' at ../src/target/i386/emulate/x86_decode.c:1796:15: ../src/target/i386/emulate/x86_decode.c:1703:5: error: 'memcpy' forming offset [4, 7] is out of the bounds [0, 4] of object 'val' with type 'target_ulong' {aka 'unsigned int'} [-Werror=array-bounds=] 1703 | memcpy(&val, | ^~~~~~~~~~~~ 1704 | get_reg_ref(env, reg, rex_present, is_extended, size), | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1705 | size); | ~~~~~ ../src/target/i386/emulate/x86_decode.c: In function 'calc_modrm_operand64': ../src/target/i386/emulate/x86_decode.c:1702:18: note: 'val' declared here 1702 | target_ulong val = 0; | ^~~ In the calc_modrm_operand64() case the compiler sees size == 8 to be mem-copied to a target_ulong variable which is only 4 bytes wide in case of i386-softmmu. Note that when size != 1, get_reg_ref() always returns a pointer to an 8 byte register, regardless of the target_ulong size. Fix the compiler warning by always providing 8 bytes of storage by means of uint64_t. Fixes: 77a2dba45cc9 ("target/i386/emulate: stop overloading decode->op[N].ptr") cc: qemu-stable Signed-off-by: Bernhard Beschow <shentey@gmail.com> Reviewed-by: Mohamed Mediouni <mohamed@unpredictable.fr> Reviewed-by: Wei Liu (Microsoft) <wei.liu@kernel.org> Link: https://lore.kernel.org/r/20260223233950.96076-2-mohamed@unpredictable.fr Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>