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-rw-r--r--README.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/README.txt b/README.txt
index cbeb10cf9..b37c0aecd 100644
--- a/README.txt
+++ b/README.txt
@@ -106,6 +106,15 @@ si_int __mulvsi3(si_int a, si_int b); // a * b
di_int __mulvdi3(di_int a, di_int b); // a * b
ti_int __mulvti3(ti_int a, ti_int b); // a * b
+
+// Integral arithmetic which returns if overflow
+
+si_int __mulosi4(si_int a, si_int b, int* overflow); // a * b, overflow set to one if result not in signed range
+di_int __mulodi4(di_int a, di_int b, int* overflow); // a * b, overflow set to one if result not in signed range
+ti_int __muloti4(ti_int a, ti_int b, int* overflow); // a * b, overflow set to
+ one if result not in signed range
+
+
// Integral comparison: a < b -> 0
// a == b -> 1
// a > b -> 2