I noticed high and low in there so those code snippets look like 32 bit code, at least to me. Is that even a fair comparison given the arm and x86 versions use

I noticed high and low in there so those code snippets look like 32 bit code, at least to me. Is that even a fair comparison given the arm and x86 versions used as examples of "better" were 64 bit? If we're really comparing 32 and 64 and complaining that 32 bit uses more instructions than 64, perhaps we should dig out the 4 bit processors and really sharpen the pitchforks. Alternatively, we could simply not. Comparing apples to oranges doesn't really help. From the article: Let's look at some examples of how Risc V underperforms. First, addition of a double-word integer with carry-out: add t0, a4, a6 // add low words sltu t6, t0, a4 // compute carry-out from low add add t1, a5, a7 // add hi words sltu t2, t1, a5 // compute carry-out from high add add t4, t1, t6 // add carry to low result sltu t3, t4, t1 // compute carry out from the carry add add t6, t2, t3 // combine carries Same for 64-bit arm: adds x12, x6, x10 adcs x13, x7, x11 Same for 64-bit x86: add %r8, %rax adc %r9, %rdx