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Diffstat (limited to 'src/a.tex')
| -rw-r--r-- | src/a.tex | 6 |
1 files changed, 3 insertions, 3 deletions
@@ -1,8 +1,8 @@ \chapter{``A'' Standard Extension for Atomic Instructions, Version 2.0} \label{atomics} -The standard atomic instruction extension is denoted by instruction -subset name ``A'', and contains instructions that atomically +The standard atomic-instruction extension, named ``A'', +contains instructions that atomically read-modify-write memory to support synchronization between multiple RISC-V harts running in the same memory space. The two forms of atomic instruction provided are load-reserved/store-conditional @@ -149,7 +149,7 @@ sequence plus the code to retry the sequence in case of failure must comprise at most 16 integer instructions placed sequentially in memory. For the sequence to be guaranteed to eventually succeed, the dynamic code executed between the LR and SC instructions can only -contain other instructions from the base ``I'' subset, excluding +contain other instructions from the base ``I'' instruction set, excluding loads, stores, backward jumps or taken backward branches, FENCE, FENCE.I, and SYSTEM instructions. The code to retry a failing LR/SC sequence can contain backward jumps and/or branches to repeat the |