Section 22.8 Subset Naming Convention of the RISC-V ISA Specification
defines the canonical order for extensions in the ISA string. It is
silent on the position of the E extension however E is a substitute
for I so it must come early in the extension list order. A comment
is added to state E and I are mutually exclusive, as the E extension
will be added to the RISC-V port in the future.
Cc: Sagar Karandikar <sag...@eecs.berkeley.edu>
Cc: Bastian Koppelmann <kbast...@mail.uni-paderborn.de>
Signed-off-by: Michael Clark <m...@sifive.com>
Signed-off-by: Palmer Dabbelt <pal...@sifive.com>
---
target/riscv/cpu.c | 2 +-
target/riscv/cpu.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 9de34d7..ad65b39 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -26,7 +26,7 @@
/* RISC-V CPU definitions */
-static const char riscv_exts[26] = "IMAFDQECLBJTPVNSUHKORWXYZG";
+static const char riscv_exts[26] = "IEMAFDQCLBJTPVNSUHKORWXYZG";
const char * const riscv_int_regnames[] = {
"zero", "ra ", "sp ", "gp ", "tp ", "t0 ", "t1 ", "t2 ",
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 41e06ac..1fdcd75 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -72,6 +72,7 @@
#define RV(x) ((target_ulong)1 << (x - 'A'))
#define RVI RV('I')
+#define RVE RV('E') /* E and I are mutually exclusive */
#define RVM RV('M')
#define RVA RV('A')
#define RVF RV('F')
--
2.7.0
