From e7066b8c892ea653c6078c6ce7d2c0524c683782 Mon Sep 17 00:00:00 2001
From: Donald Sebastian Leung
Date: Thu, 27 Aug 2020 16:04:00 +0800
Subject: [PATCH] Add SRAW instruction
---
rvfi/insns/insn_sraw.py | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
create mode 100644 rvfi/insns/insn_sraw.py
diff --git a/rvfi/insns/insn_sraw.py b/rvfi/insns/insn_sraw.py
new file mode 100644
index 0000000..55228db
--- /dev/null
+++ b/rvfi/insns/insn_sraw.py
@@ -0,0 +1,17 @@
+from .insn_rv64i_r_type import *
+
+"""
+SRAW instruction
+"""
+
+class InsnSraw(InsnRV64IRType):
+ def __init__(self, params):
+ super().__init__(params, 0b0100000, 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.rvfi_rs2_rdata[:5]) | (-(Value.as_signed(self.rvfi_rs1_rdata[:32]) < 0) << (32 - self.rvfi_rs2_rdata[:5]))) # https://stackoverflow.com/a/25207042
+ m.d.comb += spec_rd_wdata.eq(Mux(self.spec_rd_addr, (Mux(result[31], 2 ** (self.params.xlen - 32) - 1, 0) << 32) | result, 0))
+
+ return m