return !pointerInvalidatedByLoop(LI->getOperand(0), Size,
LI->getMetadata(LLVMContext::MD_tbaa));
} else if (CallInst *CI = dyn_cast<CallInst>(&I)) {
- // Handle obvious cases efficiently.
+ // Don't sink or hoist dbg info; it's legal, but not useful.
+ if (isa<DbgInfoIntrinsic>(I))
+ return false;
+
+ // Handle simple cases by querying alias analysis.
AliasAnalysis::ModRefBehavior Behavior = AA->getModRefBehavior(CI);
if (Behavior == AliasAnalysis::DoesNotAccessMemory)
return true;
SSA.AddAvailableValue(ExitBlock, New);
}
- // If the instruction doesn't dominate any exit blocks, it must be dead.
- if (NumInserted == 0) {
- CurAST->deleteValue(&I);
- if (!I.use_empty())
- I.replaceAllUsesWith(UndefValue::get(I.getType()));
- I.eraseFromParent();
- return;
- }
+ assert(NumInserted && "We shouldn't see dead instructions here!");
// Next, rewrite uses of the instruction, inserting PHI nodes as needed.
for (Value::use_iterator UI = I.use_begin(), UE = I.use_end(); UI != UE; ) {
--- /dev/null
+; RUN: llc < %s -O0 -mtriple=thumbv7-apple-darwin
+; rdar://9515076
+; (Make sure this doesn't crash.)
+
+define i32 @test(i32 %i) {
+ %t = trunc i32 %1 to i4
+ %r = sext i4 %t to i32
+ ret i32 %r
+}