http://llvm.org/bugs/show_bug.cgi?id=2848
Summary: new volatile regression
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]
Seen on r56938 on Ubuntu Hardy on ia32.
This is a strange one: wrong code at -O0, correct at other optimization levels.
I don't think this problem was there 24 hours ago.
[EMAIL PROTECTED]:~/volatile/tmp50$ llvm-gcc -O0 small.c -S -o - | grep g_126
.type g_126,@object
.section .gnu.linkonce.b.g_126,"aw",@nobits
.comm g_126,4,4 # g_126
The x86 code contains no load from the volatile location! The LLVM looks OK.
int mod_rhs (int x)
{
return x;
}
volatile unsigned int g_126;
int func_93 (void);
int func_93 (void)
{
return (g_126 > (mod_rhs (1)) < 0);
}
int main (void)
{
func_93 ();
return 0;
}
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