// unknown probabilities into known ones.
// FIXME: This usage is too tricky and in the future we would like to
// eliminate all unknown probabilities in MBB.
- ToBBI.BB->normalizeSuccProbs();
+ if (ToBBI.IsBrAnalyzable)
+ ToBBI.BB->normalizeSuccProbs();
SmallVector<MachineBasicBlock *, 4> FromSuccs(FromMBB.succ_begin(),
FromMBB.succ_end());
// Normalize the probabilities of ToBBI.BB's successors with all adjustment
// we've done above.
- ToBBI.BB->normalizeSuccProbs();
+ if (ToBBI.IsBrAnalyzable && FromBBI.IsBrAnalyzable)
+ ToBBI.BB->normalizeSuccProbs();
ToBBI.Predicate.append(FromBBI.Predicate.begin(), FromBBI.Predicate.end());
FromBBI.Predicate.clear();
--- /dev/null
+; RUN: llc -march=hexagon < %s
+
+; Check that branch probabilities are set correctly after performing the
+; simple variant of if-conversion. The converted block has a branch that
+; is not analyzable.
+
+target triple = "hexagon"
+
+declare void @foo()
+
+; CHECK-LABEL: danny
+; CHECK: if (p0.new) jump:nt foo
+define void @danny(i32 %x) {
+ %t0 = icmp sgt i32 %x, 0
+ br i1 %t0, label %tail, label %exit, !prof !0
+tail:
+ tail call void @foo();
+ ret void
+exit:
+ ret void
+}
+
+; CHECK-LABEL: sammy
+; CHECK: if (!p0.new) jump:t foo
+define void @sammy(i32 %x) {
+ %t0 = icmp sgt i32 %x, 0
+ br i1 %t0, label %exit, label %tail, !prof !0
+tail:
+ tail call void @foo();
+ ret void
+exit:
+ ret void
+}
+
+!0 = !{!"branch_weights", i32 1, i32 2000}
+