http://llvm.org/bugs/show_bug.cgi?id=19391
Bug ID: 19391
Summary: clang 3.4 hangs in
SymbolTableListTraits::transferNodesFromList() w/ -Os
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
clang 3.4 on x86_64-pc-linux-gnu hangs when compiling the following test case
w/ -Os:
static int
bv(void)
{
static int zv = 1;
int wf = 1;
h3:
for (zv = 0; zv < 1; ++zv)
if (0 != wf)
goto h3;
return 0;
}
static void
sj(int d2)
{
int ol;
int fo;
int *rf = &fo;
volatile int *as = &fo;
for (d2 = 0; d2 < 2; ++d2)
*as = 0;
for (ol = 15; ol != 2; ol -= 3U)
if (ol != (0 == *rf)) {
static int st;
for (st = 0; st < 1; ++st)
;
}
}
void
u1(void)
{
sj(bv());
}
It seems that the endless loop occurs in
llvm::SymbolTableListTraits<llvm::Instruction,
llvm::BasicBlock>::transferNodesFromList(llvm::ilist_traits<llvm::Instruction>&,
llvm::ilist_iterator<llvm::Instruction>,
llvm::ilist_iterator<llvm::Instruction>).
W/ the following change to the test case compilation takes a few seconds but
eventually ends successfully:
static void
sj(int d2)
{
- int ol;
+ short int ol;
int fo;
int *rf = &fo;
volatile int *as = &fo;
for (d2 = 0; d2 < 2; ++d2)
*as = 0;
- for (ol = 15; ol != 2; ol -= 3U)
+ for (ol = 15; ol != 2; ol -= 3)
if (ol != (0 == *rf)) {
static int st;
for (st = 0; st < 1; ++st)
--
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