Q extension floating point support

Complete Q extension implementation including Zfa instructions

Based on original work by 'LiuTaowen-Tony' in #187

Author: jordancarlin

CMakeLists.txt

@@ -112,7 +112,7 @@ if (NOT SAIL_BIN)
 endif()
 message(STATUS "Found sail: ${SAIL_BIN}")
 
-set(DEFAULT_ARCHITECTURES "rv32d;rv64d" CACHE STRING "Architectures to build by default (rv32f|rv64f|rv32d|rv64d)(_rvfi)? " )
+set(DEFAULT_ARCHITECTURES "rv32d;rv64d" CACHE STRING "Architectures to build by default (rv32f|rv64f|rv32d|rv64d|rv32q|rv64q)(_rvfi)? " )
 
 option(COVERAGE "Compile with Sail coverage collection enabled.")
 

Makefile.old

@@ -6,6 +6,7 @@
 
 # Select architecture: RV32 or RV64.
 ARCH ?= RV64
+FLEN ?= 64
 
 ifeq ($(ARCH),32)
   override ARCH := RV32
@@ -21,8 +22,17 @@ else
   $(error '$(ARCH)' is not a valid architecture, must be one of: RV32, RV64)
 endif
 
+ifeq ($(FLEN),32)
+	SAIL_FLEN := riscv_flen_F.sail
+else ifeq ($(FLEN),64)
+  SAIL_FLEN := riscv_flen_D.sail
+else ifeq ($(FLEN),128)
+  SAIL_FLEN := riscv_flen_Q.sail
+else
+  $(error '$(FLEN)' is not a valid value for FLEN, must be one of: 32, 64, 128)
+endif
+
 SAIL_XLEN += riscv_xlen.sail
-SAIL_FLEN := riscv_flen_D.sail
 SAIL_FLEN += riscv_flen.sail
 SAIL_VLEN := riscv_vlen.sail
 
@@ -31,6 +41,7 @@ SAIL_CHECK_SRCS = riscv_addr_checks_common.sail riscv_addr_checks.sail riscv_mis
 SAIL_DEFAULT_INST = riscv_insts_base.sail riscv_insts_zifencei.sail riscv_insts_aext.sail riscv_insts_zca.sail riscv_insts_mext.sail riscv_insts_zicsr.sail riscv_insts_hints.sail
 SAIL_DEFAULT_INST += riscv_insts_fext.sail riscv_insts_zcf.sail
 SAIL_DEFAULT_INST += riscv_insts_dext.sail riscv_insts_zcd.sail
+SAIL_DEFAULT_INST += riscv_insts_qext.sail
 
 SAIL_DEFAULT_INST += riscv_insts_svinval.sail
 

c_emulator/CMakeLists.txt

@@ -13,13 +13,15 @@ set(EMULATOR_COMMON_SRCS
 )
 
 foreach (xlen IN ITEMS 32 64)
-    foreach (flen IN ITEMS 32 64)
+    foreach (flen IN ITEMS 32 64 128)
         foreach (variant IN ITEMS "" "rvfi")
             set(arch "rv${xlen}")
             if (flen EQUAL 32)
                 string(APPEND arch "f")
-            else()
+            elseif (flen EQUAL 64)
                 string(APPEND arch "d")
+            else()
+                string(APPEND arch "q")
             endif()
             if (variant)
                 string(APPEND arch "_${variant}")

c_emulator/riscv_sail.h

@@ -62,7 +62,7 @@ extern mach_bits zmstatus;
 extern mach_bits zmepc, zmtval;
 extern mach_bits zsepc, zstval;
 
-extern mach_bits zfloat_result, zfloat_fflags;
+extern mach_bits zfloat_result, zfloat_result_high, zfloat_fflags;
 
 struct zMcause {
   mach_bits zMcause_chunk_0;