http://llvm.org/bugs/show_bug.cgi?id=3275
Summary: math bug
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
This bug is seen on Ubuntu Hardy on x86.
The history of this bug is interesting: versions up to and including 61026 do
the right thing. Subsequent versions of llvm-gcc fail to build, reporting
bootstrap problems, until 61169, which builds but miscompiles this program.
The bug remains up through 61514, the last one I tested.
reg...@john-home:~/volatile/tmp91$ llvm-gcc -O0 small.c -o small
reg...@john-home:~/volatile/tmp91$ ./small
32767
reg...@john-home:~/volatile/tmp91$ llvm-gcc -O1 small.c -o small
reg...@john-home:~/volatile/tmp91$ ./small
-1
reg...@john-home:~/volatile/tmp91$ cat small.c
#include <stdio.h>
short g_16;
void func_15 (void);
void func_15 (void)
{
for (; g_16 < 1; g_16 = (short)((unsigned)g_16-1U))
{
}
}
int main (void)
{
func_15 ();
printf ("%d\n", g_16);
return 0;
}
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