================
@@ -265,3 +265,125 @@ void test_empty_while_true() {
// OGCG: br label %[[WHILE_BODY:.*]]
// OGCG: [[WHILE_BODY]]:
// OGCG: ret void
+
+void unreachable_after_continue() {
+ for (;;) {
+ continue;
+ int x = 1;
+ }
+}
+
+// CIR: cir.func @unreachable_after_continue
+// CIR: cir.scope {
+// CIR: cir.for : cond {
+// CIR: %[[TRUE:.*]] = cir.const #true
+// CIR: cir.condition(%[[TRUE]])
+// CIR: } body {
+// CIR: cir.scope {
+// CIR: %[[X:.*]] = cir.alloca !s32i, !cir.ptr<!s32i>, ["x", init]
{alignment = 4 : i64}
+// CIR: cir.continue
+// CIR: ^bb1: // no predecessors
+// CIR: %[[ONE:.*]] = cir.const #cir.int<1> : !s32i
+// CIR: cir.store %[[ONE]], %[[X]] : !s32i, !cir.ptr<!s32i>
+// CIR: cir.yield
+// CIR: }
+// CIR: cir.yield
+// CIR: } step {
+// CIR: cir.yield
+// CIR: }
+// CIR: }
+// CIR: cir.return
+// CIR: }
+
+// LLVM: define void @unreachable_after_continue()
----------------
andykaylor wrote:
Yeah, this is a bit messy. This is the result of "flattening" the CIR above and
then transcribing that directly to LLVM IR. Each region ends up getting its own
block, and the explicit `cir.scope` gets a different block than its implicit
parent region. So, the unlabeled entry block is the function parent region.
LABEL1 corresponds to the `cir.scope` on line 277 (and is where the
initialization would happen). LABEL2 corresponds to the `cir.cond` region of
the for loop. LABEL3 is the "step" region. LABEL4 is the entry to the for-loop
body. LABEL5 is the portion of the body below the `continue` statement. LABEL6
is where the `cir.yield` on line 288 jumps. LABEL7 is the `cir.yield` statement
on line 290. LABEL8 is the portion of the `cir.scope` below the loop (i.e. line
294). And label is the part of the function region below the explicit
`cir.scope`.
It would make a bit more sense if most of these regions weren't empty. Ideally,
we'd not cleaning all this up in the CIRCanonicalize pass. but I think right
now that gets run before CIR flattening. That's something we should revisit.
https://github.com/llvm/llvm-project/pull/134181
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