AMDGPU: Fix trying to skip from a block with no successors
Found while reducing bug 28550
llvm-svn: 275509
diff --git a/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll b/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
index 26733ba..a1ffba5 100644
--- a/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
+++ b/llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
@@ -298,6 +298,44 @@
ret void
}
+; CHECK-LABEL: {{^}}no_skip_no_successors:
+; CHECK: v_cmp_nle_f32
+; CHECK: s_and_b64 vcc, exec,
+; CHECK: s_cbranch_vccz [[SKIPKILL:BB[0-9]+_[0-9]+]]
+
+; CHECK: ; BB#3: ; %bb6
+; CHECK: s_mov_b64 exec, 0
+
+; CHECK: [[SKIPKILL]]:
+; CHECK: v_cmp_nge_f32
+; CHECK: s_and_b64 vcc, exec, vcc
+; CHECK: s_cbranch_vccz [[UNREACHABLE:BB[0-9]+_[0-9]+]]
+
+; CHECK: [[UNREACHABLE]]:
+; CHECK-NEXT: .Lfunc_end{{[0-9]+}}
+define amdgpu_ps void @no_skip_no_successors(float inreg %arg, float inreg %arg1) #0 {
+bb:
+ %tmp = fcmp ult float %arg1, 0.000000e+00
+ %tmp2 = fcmp ult float %arg, 0x3FCF5C2900000000
+ br i1 %tmp, label %bb6, label %bb3
+
+bb3: ; preds = %bb
+ br i1 %tmp2, label %bb5, label %bb4
+
+bb4: ; preds = %bb3
+ br i1 true, label %bb5, label %bb7
+
+bb5: ; preds = %bb4, %bb3
+ unreachable
+
+bb6: ; preds = %bb
+ call void @llvm.AMDGPU.kill(float -1.000000e+00)
+ unreachable
+
+bb7: ; preds = %bb4
+ ret void
+}
+
declare void @llvm.AMDGPU.kill(float) #0
attributes #0 = { nounwind }