arch-riscv: Add RV64 vector extension support

  Co-authored-by: Xuan Hu <[email protected]>
  Co-authored-by: Yang Liu <[email protected]>
  Co-authored-by: Fan Yang <[email protected]>
  Co-authored-by: Jerin Joy <[email protected]>

ext/softfloat/SConscript

@@ -160,6 +160,8 @@ SoftfloatFile('f64_to_ui32.c')
 SoftfloatFile('f64_to_ui32_r_minMag.c')
 SoftfloatFile('f64_to_ui64.c')
 SoftfloatFile('f64_to_ui64_r_minMag.c')
+SoftfloatFile('fall_maxmin.c')
+SoftfloatFile('fall_reciprocal.c')
 SoftfloatFile('i32_to_f128.c')
 SoftfloatFile('i32_to_f16.c')
 SoftfloatFile('i32_to_f32.c')

ext/softfloat/fall_maxmin.c

@@ -0,0 +1,73 @@
+
+/*============================================================================
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3d, by John R. Hauser.
+Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
+California.  All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+ 1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions, and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+    this list of conditions, and the following disclaimer in the documentation
+    and/or other materials provided with the distribution.
+ 3. Neither the name of the University nor the names of its contributors may
+    be used to endorse or promote products derived from this software without
+    specific prior written permission.
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
+EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
+DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+=============================================================================*/
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+#define COMPARE_MAX(a, b, bits) \
+float ## bits ## _t f ## bits ## _max( float ## bits ## _t a, float ## bits ## _t b )          \
+{                                                                                              \
+    bool greater = f ## bits ## _lt_quiet(b, a) ||                                             \
+               (f ## bits ## _eq(b, a) && signF ## bits ## UI(b.v));                           \
+                                                                                               \
+    if (isNaNF ## bits ## UI(a.v) && isNaNF ## bits ## UI(b.v)) {                              \
+        union ui ## bits ## _f ## bits  ui;                                                    \
+        ui.ui = defaultNaNF ## bits ## UI;                                                     \
+        return ui.f;                                                                           \
+    } else {                                                                                   \
+        return greater || isNaNF ## bits ## UI((b).v) ? a : b;                                 \
+    }                                                                                          \
+}
+
+#define COMPARE_MIN(a, b, bits) \
+float ## bits ## _t f ## bits ## _min( float ## bits ## _t a, float ## bits ## _t b )          \
+{                                                                                              \
+    bool less = f ## bits ## _lt_quiet(a, b) ||                                                \
+               (f ## bits ## _eq(a, b) && signF ## bits ## UI(a.v));                           \
+                                                                                               \
+    if (isNaNF ## bits ## UI(a.v) && isNaNF ## bits ## UI(b.v)) {                              \
+        union ui ## bits ## _f ## bits  ui;                                                    \
+        ui.ui = defaultNaNF ## bits ## UI;                                                     \
+        return ui.f;                                                                           \
+    } else {                                                                                   \
+        return less || isNaNF ## bits ## UI((b).v) ? a : b;                                    \
+    }                                                                                          \
+}
+
+COMPARE_MAX(a, b, 16);
+COMPARE_MAX(a, b, 32);
+COMPARE_MAX(a, b, 64);
+
+COMPARE_MIN(a, b, 16);
+COMPARE_MIN(a, b, 32);
+COMPARE_MIN(a, b, 64);