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authorBjörn-Egil Dahlberg <[email protected]>2013-10-26 21:01:41 +0200
committerBjörn-Egil Dahlberg <[email protected]>2014-01-29 11:08:41 +0100
commitd5c238473b9cec819d93faaef4ccc00ddb60465f (patch)
tree2d77f2bfb414d8adff9013b52e8d512a29caaad2 /erts/emulator
parentfaf92c5174c7b86d2b5829c928b187753b3918e1 (diff)
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erts: Add cmp_term to compare
Uses total order of types meaning int < float
Diffstat (limited to 'erts/emulator')
-rw-r--r--erts/emulator/beam/erl_utils.h46
-rw-r--r--erts/emulator/beam/utils.c13
2 files changed, 41 insertions, 18 deletions
diff --git a/erts/emulator/beam/erl_utils.h b/erts/emulator/beam/erl_utils.h
index 292d135946..c6247c7246 100644
--- a/erts/emulator/beam/erl_utils.h
+++ b/erts/emulator/beam/erl_utils.h
@@ -202,23 +202,37 @@ int eq(Eterm, Eterm);
#define EQ(x,y) (((x) == (y)) || (is_not_both_immed((x),(y)) && eq((x),(y))))
#if HALFWORD_HEAP
-Sint cmp_rel(Eterm, Eterm*, Eterm, Eterm*);
-#define CMP(A,B) cmp_rel(A,NULL,B,NULL)
+Sint cmp_rel_opt(Eterm, Eterm*, Eterm, Eterm*, int);
+#define cmp_rel(A,A_BASE,B,B_BASE) cmp_rel_opt(A,A_BASE,B,B_BASE,0)
+#define cmp_rel_exact(A,A_BASE,B,B_BASE) cmp_rel_opt(A,A_BASE,B,B_BASE,1)
+#define CMP(A,B) cmp_rel(A,NULL,B,NULL,0)
+#define CMP_TERM(A,B) cmp_rel(A,NULL,B,NULL,1)
#else
-Sint cmp(Eterm, Eterm);
-#define cmp_rel(A,A_BASE,B,B_BASE) cmp(A,B)
-#define CMP(A,B) cmp(A,B)
+Sint cmp(Eterm, Eterm, int);
+#define cmp_rel(A,A_BASE,B,B_BASE) cmp(A,B,0)
+#define cmp_rel_term(A,A_BASE,B,B_BASE) cmp(A,B,1)
+#define CMP(A,B) cmp(A,B,0)
+#define CMP_TERM(A,B) cmp(A,B,1)
#endif
-#define cmp_lt(a,b) (CMP((a),(b)) < 0)
-#define cmp_le(a,b) (CMP((a),(b)) <= 0)
-#define cmp_eq(a,b) (CMP((a),(b)) == 0)
-#define cmp_ne(a,b) (CMP((a),(b)) != 0)
-#define cmp_ge(a,b) (CMP((a),(b)) >= 0)
-#define cmp_gt(a,b) (CMP((a),(b)) > 0)
-
-#define CMP_LT(a,b) ((a) != (b) && cmp_lt((a),(b)))
-#define CMP_GE(a,b) ((a) == (b) || cmp_ge((a),(b)))
-#define CMP_EQ(a,b) ((a) == (b) || cmp_eq((a),(b)))
-#define CMP_NE(a,b) ((a) != (b) && cmp_ne((a),(b)))
+
+#define cmp_lt(a,b) (CMP((a),(b)) < 0)
+#define cmp_le(a,b) (CMP((a),(b)) <= 0)
+#define cmp_eq(a,b) (CMP((a),(b)) == 0)
+#define cmp_ne(a,b) (CMP((a),(b)) != 0)
+#define cmp_ge(a,b) (CMP((a),(b)) >= 0)
+#define cmp_gt(a,b) (CMP((a),(b)) > 0)
+
+#define cmp_lt_term(a,b) (CMP_TERM((a),(b)) < 0)
+#define cmp_le_term(a,b) (CMP_TERM((a),(b)) <= 0)
+#define cmp_ge_term(a,b) (CMP_TERM((a),(b)) >= 0)
+#define cmp_gt_term(a,b) (CMP_TERM((a),(b)) > 0)
+
+#define CMP_LT(a,b) ((a) != (b) && cmp_lt((a),(b)))
+#define CMP_GE(a,b) ((a) == (b) || cmp_ge((a),(b)))
+#define CMP_EQ(a,b) ((a) == (b) || cmp_eq((a),(b)))
+#define CMP_NE(a,b) ((a) != (b) && cmp_ne((a),(b)))
+
+#define CMP_LT_TERM(a,b) ((a) != (b) && cmp_lt_term((a),(b)))
+#define CMP_GE_TERM(a,b) ((a) == (b) || cmp_ge_term((a),(b)))
#endif
diff --git a/erts/emulator/beam/utils.c b/erts/emulator/beam/utils.c
index 8958d334ae..bc4a05d385 100644
--- a/erts/emulator/beam/utils.c
+++ b/erts/emulator/beam/utils.c
@@ -2425,10 +2425,14 @@ static int cmp_atoms(Eterm a, Eterm b)
bb->name+3, bb->len-3);
}
+/* cmp(Eterm a, Eterm b, int exact)
+ * exact = 1 -> term-based compare
+ * exact = 0 -> arith-based compare
+ */
#if HALFWORD_HEAP
-Sint cmp_rel(Eterm a, Eterm* a_base, Eterm b, Eterm* b_base)
+Sint cmp_rel_opt(Eterm a, Eterm* a_base, Eterm b, Eterm* b_base, int exact)
#else
-Sint cmp(Eterm a, Eterm b)
+Sint cmp(Eterm a, Eterm b, int exact)
#endif
{
DECLARE_WSTACK(stack);
@@ -2852,6 +2856,7 @@ tailrecur_ne:
j = big_sign(aw) ? -1 : 1;
break;
case SMALL_FLOAT:
+ if (exact) goto exact_fall_through;
GET_DOUBLE(bw, f2);
if (f2.fd < MAX_LOSSLESS_FLOAT && f2.fd > MIN_LOSSLESS_FLOAT) {
/* Float is within the no loss limit */
@@ -2877,12 +2882,14 @@ tailrecur_ne:
#endif /* ERTS_SIZEOF_ETERM == 8 */
break;
case FLOAT_BIG:
+ if (exact) goto exact_fall_through;
{
Wterm tmp = aw;
aw = bw;
bw = tmp;
}/* fall through */
case BIG_FLOAT:
+ if (exact) goto exact_fall_through;
GET_DOUBLE(bw, f2);
if ((f2.fd < (double) (MAX_SMALL + 1))
&& (f2.fd > (double) (MIN_SMALL - 1))) {
@@ -2912,6 +2919,7 @@ tailrecur_ne:
}
break;
case FLOAT_SMALL:
+ if (exact) goto exact_fall_through;
GET_DOUBLE(aw, f1);
if (f1.fd < MAX_LOSSLESS_FLOAT && f1.fd > MIN_LOSSLESS_FLOAT) {
/* Float is within the no loss limit */
@@ -2936,6 +2944,7 @@ tailrecur_ne:
}
#endif /* ERTS_SIZEOF_ETERM == 8 */
break;
+exact_fall_through:
default:
j = b_tag - a_tag;
}