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-rw-r--r--compiler-rt/lib/builtins/mulosi4.c65
1 files changed, 29 insertions, 36 deletions
diff --git a/compiler-rt/lib/builtins/mulosi4.c b/compiler-rt/lib/builtins/mulosi4.c
index 1732da210c2..7db178ac08f 100644
--- a/compiler-rt/lib/builtins/mulosi4.c
+++ b/compiler-rt/lib/builtins/mulosi4.c
@@ -17,41 +17,34 @@
/* Effects: sets *overflow to 1 if a * b overflows */
-COMPILER_RT_ABI si_int
-__mulosi4(si_int a, si_int b, int* overflow)
-{
- const int N = (int)(sizeof(si_int) * CHAR_BIT);
- const si_int MIN = (si_int)1 << (N-1);
- const si_int MAX = ~MIN;
- *overflow = 0;
- si_int result = a * b;
- if (a == MIN)
- {
- if (b != 0 && b != 1)
- *overflow = 1;
- return result;
- }
- if (b == MIN)
- {
- if (a != 0 && a != 1)
- *overflow = 1;
- return result;
- }
- si_int sa = a >> (N - 1);
- si_int abs_a = (a ^ sa) - sa;
- si_int sb = b >> (N - 1);
- si_int abs_b = (b ^ sb) - sb;
- if (abs_a < 2 || abs_b < 2)
- return result;
- if (sa == sb)
- {
- if (abs_a > MAX / abs_b)
- *overflow = 1;
- }
- else
- {
- if (abs_a > MIN / -abs_b)
- *overflow = 1;
- }
+COMPILER_RT_ABI si_int __mulosi4(si_int a, si_int b, int *overflow) {
+ const int N = (int)(sizeof(si_int) * CHAR_BIT);
+ const si_int MIN = (si_int)1 << (N - 1);
+ const si_int MAX = ~MIN;
+ *overflow = 0;
+ si_int result = a * b;
+ if (a == MIN) {
+ if (b != 0 && b != 1)
+ *overflow = 1;
return result;
+ }
+ if (b == MIN) {
+ if (a != 0 && a != 1)
+ *overflow = 1;
+ return result;
+ }
+ si_int sa = a >> (N - 1);
+ si_int abs_a = (a ^ sa) - sa;
+ si_int sb = b >> (N - 1);
+ si_int abs_b = (b ^ sb) - sb;
+ if (abs_a < 2 || abs_b < 2)
+ return result;
+ if (sa == sb) {
+ if (abs_a > MAX / abs_b)
+ *overflow = 1;
+ } else {
+ if (abs_a > MIN / -abs_b)
+ *overflow = 1;
+ }
+ return result;
}
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