1 files changed, 12 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/divtf3.c b/compiler-rt/lib/builtins/divtf3.c
index 17273749b5b..ba5de99f995 100644
--- a/compiler-rt/lib/builtins/divtf3.c
+++ b/compiler-rt/lib/builtins/divtf3.c
@@ -181,6 +181,18 @@ COMPILER_RT_ABI fp_t __divtf3(fp_t a, fp_t b) {
         return fromRep(infRep | quotientSign);
     }
     else if (writtenExponent < 1) {
+        if (writtenExponent == 0) {
+            // Check whether the rounded result is normal.
+            const bool round = (residual << 1) > bSignificand;
+            // Clear the implicit bit.
+            rep_t absResult = quotient & significandMask;
+            // Round.
+            absResult += round;
+            if (absResult & ~significandMask) {
+                // The rounded result is normal; return it.
+                return fromRep(absResult | quotientSign);
+            }
+        }
         // Flush denormals to zero.  In the future, it would be nice to add
         // code to round them correctly.
         return fromRep(quotientSign);