1 files changed, 105 insertions, 0 deletions
diff --git a/tests/tcg/multiarch/float_madds.c b/tests/tcg/multiarch/float_madds.c
new file mode 100644
index 000000000..e422608cc
--- /dev/null
+++ b/tests/tcg/multiarch/float_madds.c
@@ -0,0 +1,105 @@
+/*
+ * Fused Multiply Add (Single)
+ *
+ * Copyright (c) 2019 Linaro
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <float.h>
+#include <fenv.h>
+
+#include "float_helpers.h"
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+typedef struct {
+    int flag;
+    char *desc;
+} float_mapping;
+
+float_mapping round_flags[] = {
+    { FE_TONEAREST, "to nearest" },
+#ifdef FE_UPWARD
+    { FE_UPWARD, "upwards" },
+#endif
+#ifdef FE_DOWNWARD
+    { FE_DOWNWARD, "downwards" },
+#endif
+#ifdef FE_TOWARDZERO
+    { FE_TOWARDZERO, "to zero" }
+#endif
+};
+
+
+static void print_inputs(float a, float b, float c)
+{
+    char *a_fmt, *b_fmt, *c_fmt;
+
+    a_fmt = fmt_f32(a);
+    b_fmt = fmt_f32(b);
+    c_fmt = fmt_f32(c);
+
+    printf("op : %s * %s + %s\n", a_fmt, b_fmt, c_fmt);
+
+    free(a_fmt);
+    free(b_fmt);
+    free(c_fmt);
+}
+
+static void print_result(float r, int j, int k)
+{
+    char *r_fmt, *flag_fmt;
+
+    r_fmt = fmt_f32(r);
+    flag_fmt = fmt_flags();
+
+    printf("res: %s flags=%s (%d/%d)\n", r_fmt, flag_fmt, j, k);
+
+    free(r_fmt);
+    free(flag_fmt);
+}
+
+static void do_madds(float a, float b, float c, int j, int k)
+{
+    float r;
+
+    print_inputs(a, b, c);
+
+    feclearexcept(FE_ALL_EXCEPT);
+    r = __builtin_fmaf(a, b, c);
+
+    print_result(r, j, k);
+}
+
+int main(int argc, char *argv[argc])
+{
+    int i, j, k, nums = get_num_f32();
+    float a, b, c;
+
+    for (i = 0; i < ARRAY_SIZE(round_flags); ++i) {
+        if (fesetround(round_flags[i].flag) != 0) {
+            printf("### Rounding %s skipped\n", round_flags[i].desc);
+            continue;
+        }
+        printf("### Rounding %s\n", round_flags[i].desc);
+        for (j = 0; j < nums; j++) {
+            for (k = 0; k < 3; k++) {
+                a = get_f32(j + ((k)%3));
+                b = get_f32(j + ((k+1)%3));
+                c = get_f32(j + ((k+2)%3));
+                do_madds(a, b, c, j, k);
+            }
+        }
+
+        /* From https://bugs.launchpad.net/qemu/+bug/1841491 */
+        printf("# LP184149\n");
+        do_madds(0x1.ffffffffffffcp-1022, 0x1.0000000000001p-1, 0x0.0000000000001p-1022, j, 0);
+        do_madds(0x8p-152, 0x8p-152, 0x8p-152, j+1, 0);
+    }
+
+    return 0;
+}