http://llvm.org/bugs/show_bug.cgi?id=16551
Bug ID: 16551
Summary: Incorrect code for accessing a struct variable with
bit fields
Product: clang
Version: trunk
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Clang 3.4 (based on LLVM 3.4svn) for x86_64 target miscompiles the
following code.
$ cat error.c
struct S1 {
unsigned int m1 : 32;
unsigned int m2 : 24;
unsigned char m3;
};
struct S1 x = { 1U, 1U, 1U };
int main(void)
{
if ( x.m2 != 1U ) __builtin_abort();
return 0;
}
$ clang error.c
$ ./a.out
Abort trap: 6
The value of the x.m2 was 16777217 (x01000001).
There was no problem with an x86 (32bit) target.
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