| Issue |
131532
|
| Summary |
SMUL idiom
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
DTeachs
|
We already turn umul with overflow into the idiom. LLVM should do the same.
I understand this was previously done by @AZero13, but given they now plan to step away from LLVM after everything, I have volunteered to take over this issue in particular.
bool check_multiplication_overflow(int a, int b) {
// Cast to long long to perform the multiplication
long long result = (long long)a * (long long)b;
// Check if the result is within the range of int
if (result > INT_MAX || result < INT_MIN) {
return true; // Overflow occurred
}
return false; // No overflow
}
This yields the IR targeted.
This code is a modified version of what was found in systemd's source code.
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