From ade3d46b5b664653863b7948efbbaf59d53ef350 Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung
Date: Thu, 27 Aug 2020 13:52:20 +0800
Subject: [PATCH] Add SRAIW instruction
---
rvfi/insns/insn_sraiw.py | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
create mode 100644 rvfi/insns/insn_sraiw.py
diff --git a/rvfi/insns/insn_sraiw.py b/rvfi/insns/insn_sraiw.py
new file mode 100644
index 0000000..8e2b635
--- /dev/null
+++ b/rvfi/insns/insn_sraiw.py
@@ -0,0 +1,17 @@
+from .insn_rv64i_i_type_shift import *
+
+"""
+SRAIW instruction
+"""
+
+class InsnSraiw(InsnRV64IITypeShift):
+ def __init__(self, params):
+ super().__init__(params, 0b010000, 0b101)
+ def elaborate(self, platform):
+ m = super().elaborate(platform)
+
+ result = Signal(32)
+ m.d.comb += result.eq((Value.as_signed(self.rvfi_rs1_rdata[:32]) >> self.insn_shamt) | (-(Value.as_signed(self.rvfi_rs1_rdata[:32]) < 0) << (32 - self.insn_shamt))) # https://stackoverflow.com/a/25207042
+ m.d.comb += self.spec_rd_wdata.eq(Mux(self.spec_rd_addr, (Mux(result[31], 2 ** (self.params.xlen - 32) - 1, 0) << 32) | result, 0))
+
+ return m