From 475c1d9fc2b97b5a09040b713338070eeba02b6a Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung
Date: Mon, 10 Aug 2020 12:56:19 +0800
Subject: [PATCH] Add SRAI instruction
---
insns/InsnSrai.py | 15 +++++++++++++++
1 file changed, 15 insertions(+)
create mode 100644 insns/InsnSrai.py
diff --git a/insns/InsnSrai.py b/insns/InsnSrai.py
new file mode 100644
index 0000000..d95dbc8
--- /dev/null
+++ b/insns/InsnSrai.py
@@ -0,0 +1,15 @@
+from InsnRV32IITypeShift import *
+
+"""
+SRAI instruction
+"""
+
+class InsnSrai(InsnRV32IITypeShift):
+ def __init__(self, RISCV_FORMAL_ILEN, RISCV_FORMAL_XLEN, RISCV_FORMAL_CSR_MISA, RISCV_FORMAL_COMPRESSED):
+ super().__init__(RISCV_FORMAL_ILEN, RISCV_FORMAL_XLEN, RISCV_FORMAL_CSR_MISA, RISCV_FORMAL_COMPRESSED, 0b010000, 0b101)
+ def elaborate(self, platform):
+ m = super().elaborate(platform)
+
+ m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (Value.as_signed(self.rvfi_rs1_rdata) >> self.insn_shamt) | (-(Value.as_signed(self.rvfi_rs1_rdata) < 0) << (self.RISCV_FORMAL_XLEN - self.insn_shamt)), 0))
+
+ return m