The standard does not actually specify what sequence of instructions to use for the load pseudo-instruction, so it is left up to the assembler to decide. A 32-

The standard does not actually specify what sequence of instructions to use for the load pseudo-instruction, so it is left up to the assembler to decide. A 32-bit load still requires 2 instructions (The purpose of the lui instruction is to make this efficient). A 64-bit load requires loading 2 32-bit values, shifting one 32-bits right then performing a bitwise or. Alternatively you can hold the 64-bit value in .rodata and use a single instruction to load it. The point is, it takes several more instruction bits and/or cycles than a `shr 2; sar 2` for clearing the two MSBs, so the optimisation given for x86 for this sequence is not useful here and the trivial solution is better. A solution that may be better elsewhere is `btr 63; btr 62`. Since RV can specify a different destination operand you don't need an extra mov instruction as the x86 version would require.