Block after ldxp/stxp 2x64-bit (success)
0x0001020304050607
0x1011121314151617
0x5555666677778888
0xaaaa9999bbbb0000
0x4041424344454647
0x5051525354555657
0x2021222324252627 rt1contents
0x3031323334353637 rt2contents

Block after ldxp/stxp 2x32-bit (success)
0x0001020304050607
0x1011121314151617
0xbbbb000077778888
0x3031323334353637
0x4041424344454647
0x5051525354555657
0x0000000024252627 rt1contents
0x0000000020212223 rt2contents