use compiled i64 div and rem

1 files changed, 16 insertions, 0 deletions

diff --git a/system/lib/compiler-rt/divdi3.c b/system/lib/compiler-rt/divdi3.c
index 2c2bcc26..09f4a04e 100644
--- a/system/lib/compiler-rt/divdi3.c
+++ b/system/lib/compiler-rt/divdi3.c
@@ -29,3 +29,19 @@ __divdi3(di_int a, di_int b)
     s_a ^= s_b;                                  /*sign of quotient */
     return (__udivmoddi4(a, b, (du_int*)0) ^ s_a) - s_a;  /* negate if s_a == -1 */
 }
+
+/* XXX EMSCRIPTEN */
+
+COMPILER_RT_ABI di_int
+__remdi3(di_int a, di_int b)
+{
+    const int bits_in_dword_m1 = (int)(sizeof(di_int) * CHAR_BIT) - 1;
+    di_int s_a = a >> bits_in_dword_m1;           /* s_a = a < 0 ? -1 : 0 */
+    di_int s_b = b >> bits_in_dword_m1;           /* s_b = b < 0 ? -1 : 0 */
+    a = (a ^ s_a) - s_a;                         /* negate if s_a == -1 */
+    b = (b ^ s_b) - s_b;                         /* negate if s_b == -1 */
+    du_int rem;
+    __udivmoddi4(a, b, &rem);
+    return (rem ^ s_a) - s_a;  /* negate if s_a == -1 */
+}
+