// Call is not allowed because the callee may use a hardware loop except for
// the case when the call never returns.
- if (MI->getDesc().isCall() && MI->getOpcode() != Hexagon::CALLv3nr)
- return true;
+ if (MI->getDesc().isCall())
+ return !TII->doesNotReturn(*MI);
// Check if the instruction defines a hardware loop register.
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
const MachineInstr &MI2) const;
bool canExecuteInBundle(const MachineInstr &First,
const MachineInstr &Second) const;
+ bool doesNotReturn(const MachineInstr &CallMI) const;
bool hasEHLabel(const MachineBasicBlock *B) const;
bool hasNonExtEquivalent(const MachineInstr &MI) const;
bool hasPseudoInstrPair(const MachineInstr &MI) const;
--- /dev/null
+; RUN: llc -march=hexagon < %s | FileCheck %s
+
+target triple = "hexagon"
+
+; CHECK-LABEL: danny:
+; CHECK-DAG: loop0
+; CHECK-DAG: call trap
+define void @danny(i32* %p, i32 %n, i32 %k) #0 {
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry
+ %t0 = phi i32 [ 0, %entry ], [ %t1, %for.cont ]
+ %t1 = add i32 %t0, 1
+ %t2 = getelementptr i32, i32* %p, i32 %t0
+ store i32 %t1, i32* %t2, align 4
+ %c = icmp sgt i32 %t1, %k
+ br i1 %c, label %noret, label %for.cont
+
+for.cont:
+ %cmp = icmp slt i32 %t0, %n
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.cond
+ ret void
+
+noret:
+ call void @trap() #1
+ br label %for.cont
+}
+
+; CHECK-LABEL: sammy:
+; CHECK-DAG: loop0
+; CHECK-DAG: callr
+define void @sammy(i32* %p, i32 %n, i32 %k, void (...)* %f) #0 {
+entry:
+ br label %for.body
+
+for.body: ; preds = %entry
+ %t0 = phi i32 [ 0, %entry ], [ %t1, %for.cont ]
+ %t1 = add i32 %t0, 1
+ %t2 = getelementptr i32, i32* %p, i32 %t0
+ store i32 %t1, i32* %t2, align 4
+ %c = icmp sgt i32 %t1, %k
+ br i1 %c, label %noret, label %for.cont
+
+for.cont:
+ %cmp = icmp slt i32 %t0, %n
+ br i1 %cmp, label %for.body, label %for.end
+
+for.end: ; preds = %for.cond
+ ret void
+
+noret:
+ call void (...) %f() #1
+ br label %for.cont
+}
+
+declare void @trap() #1
+
+attributes #0 = { nounwind "target-cpu"="hexagonv60" "target-features"="+hvx,-hvx-double" }
+attributes #1 = { nounwind noreturn }
+