rdinstret

# Read the retired-instruction counter twice. Inspect t2=0: the second unsigned reading did not decrease.
.text
rdinstret t0
rdinstret t1
bltu t1, t0, backwards # Test whether the second reading is lower, treating both as unsigned.
li t2, 0
j done # Keep t2=0 by skipping the alternate result block.
backwards:
li t2, 1
done:
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