http://llvm.org/bugs/show_bug.cgi?id=22795
Bug ID: 22795
Summary: miscompile with -O2 (suspected incorrect loop trip
count computation)
Product: new-bugs
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
% cat z.cc
#include <stdio.h>
#include <stdint.h>
#include <string.h>
int main(int argc, char **argv) {
const int n = 16;
int64_t bins[n] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
for (int ix = 0; ix < n; ++ix)
for (int jx = 0; jx < ix; ++jx)
bins[ix]++;
fprintf(stderr, "%ld\n", bins[10]);
}
% clang++ -O1 z.cc && ./a.out
10
% clang++ -O2 z.cc && ./a.out
4294967306
%
Something is messed up in computation of the loop trip count.
This is r231268 on x86_64 linux.
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
