rvv: extend softfloat to support 16-64 min/max function

Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>

3 files changed, 88 insertions, 0 deletions

diff --git a/softfloat/fall_maxmin.c b/softfloat/fall_maxmin.c
new file mode 100644
index 0000000..08f1d40
--- /dev/null
+++ b/softfloat/fall_maxmin.c
@@ -0,0 +1,81 @@
+
+/*============================================================================
+
+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 )          \
+{                                                                                              \
+    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;                                                                           \
+    }                                                                                          \
+                                                                                               \
+    bool greater = f ## bits ## _lt_quiet(b, a) ||                                             \
+               (f ## bits ## _eq(b, a) && signF ## bits ## UI(b.v));                           \
+                                                                                               \
+    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 )          \
+{                                                                                              \
+    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;                                                                           \
+    }                                                                                          \
+                                                                                               \
+    bool greater = f ## bits ## _lt_quiet(a, b) ||                                             \
+               (f ## bits ## _eq(a, b) && signF ## bits ## UI(a.v));                           \
+                                                                                               \
+    return greater || 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);
diff --git a/softfloat/softfloat.h b/softfloat/softfloat.h
index b277281..ddc39e3 100644
--- a/softfloat/softfloat.h
+++ b/softfloat/softfloat.h
@@ -160,6 +160,8 @@ void f16_to_f128M( float16_t, float128_t * );
 float16_t f16_roundToInt( float16_t, uint_fast8_t, bool );
 float16_t f16_add( float16_t, float16_t );
 float16_t f16_sub( float16_t, float16_t );
+float16_t f16_max( float16_t, float16_t );
+float16_t f16_min( float16_t, float16_t );
 float16_t f16_mul( float16_t, float16_t );
 float16_t f16_mulAdd( float16_t, float16_t, float16_t );
 float16_t f16_div( float16_t, float16_t );
@@ -195,6 +197,8 @@ void f32_to_f128M( float32_t, float128_t * );
 float32_t f32_roundToInt( float32_t, uint_fast8_t, bool );
 float32_t f32_add( float32_t, float32_t );
 float32_t f32_sub( float32_t, float32_t );
+float32_t f32_max( float32_t, float32_t );
+float32_t f32_min( float32_t, float32_t );
 float32_t f32_mul( float32_t, float32_t );
 float32_t f32_mulAdd( float32_t, float32_t, float32_t );
 float32_t f32_div( float32_t, float32_t );
@@ -231,6 +235,8 @@ void f64_to_f128M( float64_t, float128_t * );
 float64_t f64_roundToInt( float64_t, uint_fast8_t, bool );
 float64_t f64_add( float64_t, float64_t );
 float64_t f64_sub( float64_t, float64_t );
+float64_t f64_max( float64_t, float64_t );
+float64_t f64_min( float64_t, float64_t );
 float64_t f64_mul( float64_t, float64_t );
 float64_t f64_mulAdd( float64_t, float64_t, float64_t );
 float64_t f64_div( float64_t, float64_t );
diff --git a/softfloat/softfloat.mk.in b/softfloat/softfloat.mk.in
index b5403a8..52ee1dd 100644
--- a/softfloat/softfloat.mk.in
+++ b/softfloat/softfloat.mk.in
@@ -117,6 +117,7 @@ softfloat_c_srcs = \
 	f64_to_ui32_r_minMag.c \
 	f64_to_ui64.c \
 	f64_to_ui64_r_minMag.c \
+	fall_maxmin.c \
 	i32_to_f128.c \
 	i32_to_f16.c \
 	i32_to_f32.c \