From 5736b2d3be39b9ae71f5801e1143d87628929c4d Mon Sep 17 00:00:00 2001 From: Andrew Waterman Date: Mon, 20 Jul 2020 15:30:00 -0700 Subject: clarify that high counters are RV32I-only --- src/counters.tex | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'src/counters.tex') diff --git a/src/counters.tex b/src/counters.tex index 2139d34..3160a27 100644 --- a/src/counters.tex +++ b/src/counters.tex @@ -41,7 +41,7 @@ pieces using CSRRS instructions. In RV64I, the CSR instructions can manipulate 64-bit CSRs. In particular, the RDCYCLE, RDTIME, and RDINSTRET pseudoinstructions read the full 64 bits of the {\tt cycle}, {\tt time}, and {\tt instret} counters. Hence, the RDCYCLEH, RDTIMEH, -and RDINSTRETH instructions are not required in RV64I. +and RDINSTRETH instructions are RV32I-only. \begin{commentary} Some execution environments might prohibit access to counters to -- cgit v1.1