xi (Xi Wang)
- Login: xi
- Registered on: 07/15/2012
- Last sign in: 04/03/2013
Issues
| open | closed | Total | |
|---|---|---|---|
| Assigned issues | 0 | 0 | 0 |
| Reported issues | 0 | 1 | 1 |
Activity
12/31/2012
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02:01 PM Ruby Bug #7371: Fix undefined overflow checking in bigdecimal
- To see how it works, try to compile the following (simplified) code with gcc 4.8. The entire function will be optimized away with "gcc -O2" (just grep "bar" in the resulting assembly code); gcc 4.7 or earlier doesn't do that.
#define...
11/16/2012
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- In AddExponent() at ext/bigdecimal/bigdecimal.c:3677, the overflow checks rely on signed integer overflow, which is undefined behavior in C.
SIGNED_VALUE m = e+n;
SIGNED_VALUE eb, mb;
if(e>0) {
if(n>0) {
...