lib/util: use a special function to divide two signed 64 numbers

Saves ~1.4KB Signed-off-by: Adam Wujek <adam.wujek@creotech.pl>

lib/util: use a special function to divide two signed 64 numbers
Saves ~1.4KB Signed-off-by: Adam Wujek <adam.wujek@creotech.pl>
4ecfbddf · Adam Wujek · 9858c916 · 4ecfbddf · 4ecfbddf
Commit 4ecfbddf authored Feb 26, 2021 by Adam Wujek
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Showing with 17 additions and 6 deletions

check-error.c check-error.c +0 -6

util.c lib/util.c +17 -0

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--- a/check-error.c
+++ b/check-error.c
@@ -51,10 +51,4 @@ long long __udivdi3 (long long A, long long B)
 	return 0;
 }

-/* was used in set_phase_shift, phase_to_cf_units */
-long long __divdi3 (long long A, long long B)
-{
-	__you_should_not_divide_ll_in_wrpc_sw();
-	return 0;
-}
 #endif
--- a/lib/util.c
+++ b/lib/util.c
@@ -271,3 +271,20 @@ int atoi(const char *s)
 	fromdec(s, &res);
 	return res;
 }
+
+
+/* To save code, in the div of two int64 numbers
+ * use signed 64bit division, then correct the sign of the result */
+long long __divdi3 (long long A, long long B)
+{
+    int sign_a, sign_b;
+    unsigned long long a_u;
+    unsigned long long b_u;
+
+    sign_a = A < 0 ? -1 : 1;
+    sign_b = B < 0 ? -1 : 1;
+    a_u = A * sign_a;
+    b_u = A * sign_b;
+    return sign_a * sign_b * (long long) (a_u / b_u);
+}
+