https://bugs.llvm.org/show_bug.cgi?id=35760
Bug ID: 35760
Summary: [Clang-optimization] wrong code for the optimization
of static global variable with malloc.
Product: clang
Version: 4.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: yoshimatsu2...@gmail.com
CC: llvm-bugs@lists.llvm.org
#include <stdio.h>
#include <stdlib.h>
static int* g_i = NULL;
static void PutsSomething() {
if (g_i == NULL) {
g_i = (int*)malloc(sizeof(*g_i));
puts("0"); // -O0
} else {
puts("1"); // -O1, -O2
}
}
int main(void) {
g_i = NULL;
PutsSomething();
// free(g_i);
return EXIT_SUCCESS;
}
$ clang++-4.0 -O0 test.cpp; ./a.out
0
$ clang++-4.0 -O1 test.cpp; ./a.out
1
$ clang++-4.0 -O2 test.cpp; ./a.out
1
The output is different while the optimization is enabled.
When I cancel comment for free(g_i), this behavior is not seen.
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