Implement the new ceil/1 and floor/1 guard BIFs

Implement as ceil/1 and floor/1 as new guard BIFs (essentially part of
Erlang language). They are guard BIFs because trunc/1 is a guard
BIF. It would be strange to have trunc/1 as a part of the language, but
not ceil/1 and floor/1.

2 files changed, 72 insertions, 0 deletions

diff --git a/erts/emulator/beam/bif.tab b/erts/emulator/beam/bif.tab
index 7a35c02934..67eae35dec 100644
--- a/erts/emulator/beam/bif.tab
+++ b/erts/emulator/beam/bif.tab
@@ -659,6 +659,13 @@ bif erlang:has_prepared_code_on_load/1
 bif maps:take/2
 
 #
+# New in 20.0
+#
+
+gcbif erlang:floor/1
+gcbif erlang:ceil/1
+
+#
 # Obsolete
 #
 
diff --git a/erts/emulator/beam/erl_bif_guard.c b/erts/emulator/beam/erl_bif_guard.c
index b42d2dc28b..458315f293 100644
--- a/erts/emulator/beam/erl_bif_guard.c
+++ b/erts/emulator/beam/erl_bif_guard.c
@@ -141,6 +141,39 @@ BIF_RETTYPE trunc_1(BIF_ALIST_1)
     BIF_RET(res);
 }
 
+BIF_RETTYPE floor_1(BIF_ALIST_1)
+{
+    Eterm res;
+    FloatDef f;
+
+    if (is_not_float(BIF_ARG_1)) {
+	if (is_integer(BIF_ARG_1))
+	    BIF_RET(BIF_ARG_1);
+	BIF_ERROR(BIF_P, BADARG);
+    }
+    GET_DOUBLE(BIF_ARG_1, f);
+    res = double_to_integer(BIF_P, floor(f.fd));
+    BIF_RET(res);
+}
+
+BIF_RETTYPE ceil_1(BIF_ALIST_1)
+{
+    Eterm res;
+    FloatDef f;
+
+    /* check arg */
+    if (is_not_float(BIF_ARG_1)) {
+	if (is_integer(BIF_ARG_1))
+	    BIF_RET(BIF_ARG_1);
+	BIF_ERROR(BIF_P, BADARG);
+    }
+    /* get the float */
+    GET_DOUBLE(BIF_ARG_1, f);
+
+    res = double_to_integer(BIF_P, ceil(f.fd));
+    BIF_RET(res);
+}
+
 BIF_RETTYPE round_1(BIF_ALIST_1)
 {
     Eterm res;
@@ -621,6 +654,38 @@ Eterm erts_gc_trunc_1(Process* p, Eterm* reg, Uint live)
 				reg, live);
 }
 
+Eterm erts_gc_floor_1(Process* p, Eterm* reg, Uint live)
+{
+    Eterm arg;
+    FloatDef f;
+
+    arg = reg[live];
+    if (is_not_float(arg)) {
+	if (is_integer(arg))  {
+	    return arg;
+	}
+	BIF_ERROR(p, BADARG);
+    }
+    GET_DOUBLE(arg, f);
+    return gc_double_to_integer(p, floor(f.fd), reg, live);
+}
+
+Eterm erts_gc_ceil_1(Process* p, Eterm* reg, Uint live)
+{
+    Eterm arg;
+    FloatDef f;
+
+    arg = reg[live];
+    if (is_not_float(arg)) {
+	if (is_integer(arg))  {
+	    return arg;
+	}
+	BIF_ERROR(p, BADARG);
+    }
+    GET_DOUBLE(arg, f);
+    return gc_double_to_integer(p, ceil(f.fd), reg, live);
+}
+
 static Eterm
 gc_double_to_integer(Process* p, double x, Eterm* reg, Uint live)
 {