; RUN: llc -march=hexagon < %s -pipeliner-experimental-cg=true | FileCheck %s
; Test that the pipeliner correctly fixes up the pipelined CFG when the loop
; has a constant trip count, and the trip count is less than the number of
; prolog blocks. Prior to the bug, the pipeliner deleted one extra prolog and
; epilog stage. We check this by counting the number of sxth instructions.
; CHECK: r{{[0-9]+}} = sxth(r{{[0-9]+}})
; CHECK: r{{[0-9]+}} = sxth(r{{[0-9]+}})
; CHECK: r{{[0-9]+}} = sxth(r{{[0-9]+}})
; CHECK: r{{[0-9]+}} = sxth(r{{[0-9]+}})
; Function Attrs: nounwind readonly
define signext i16 @f0(ptr nocapture readonly %a0, ptr nocapture readnone %a1, ptr nocapture readonly %a2, ptr nocapture readonly %a3, i16 signext %a4, i16 signext %a5, i16 signext %a6) #0 {
b0:
%v0 = icmp sgt i16 %a5, 0
br i1 %v0, label %b1, label %b7
b1: ; preds = %b0
%v1 = load i16, ptr %a0, align 2
%v2 = sext i16 %v1 to i32
%v3 = load i16, ptr %a3, align 2
%v4 = sext i16 %v3 to i32
br label %b2
b2: ; preds = %b6, %b1
%v5 = phi i32 [ 2147483647, %b1 ], [ %v44, %b6 ]
%v6 = phi i16 [ 0, %b1 ], [ %v45, %b6 ]
%v7 = phi i16 [ 0, %b1 ], [ %v43, %b6 ]
%v8 = phi ptr [ %a2, %b1 ], [ %v38, %b6 ]
%v9 = load i16, ptr %v8, align 2
%v10 = sext i16 %v9 to i32
%v11 = tail call i32 @llvm.hexagon.A2.subh.l16.sat.ll(i32 %v2, i32 %v10)
%v12 = shl i32 %v11, 16
%v13 = ashr exact i32 %v12, 16
%v14 = tail call i32 @llvm.hexagon.M2.mpy.sat.ll.s1(i32 %v13, i32 %v4)
%v15 = tail call i32 @llvm.hexagon.M2.hmmpyl.s1(i32 %v14, i32 %v13)
%v16 = tail call i32 @llvm.hexagon.S2.asr.r.r.sat(i32 %v15, i32 10)
%v17 = getelementptr inbounds i16, ptr %v8, i32 1
br label %b3
b3: ; preds = %b3, %b2
%v18 = phi ptr [ %v8, %b2 ], [ %v19, %b3 ]
%v19 = phi ptr [ %v17, %b2 ], [ %v38, %b3 ]
%v20 = phi i32 [ %v16, %b2 ], [ %v36, %b3 ]
%v21 = phi i32 [ 1, %b2 ], [ %v37, %b3 ]
%v22 = getelementptr inbounds i16, ptr %a0, i32 %v21
%v23 = load i16, ptr %v22, align 2
%v24 = sext i16 %v23 to i32
%v25 = load i16, ptr %v19, align 2
%v26 = sext i16 %v25 to i32
%v27 = tail call i32 @llvm.hexagon.A2.subh.l16.sat.ll(i32 %v24, i32 %v26)
%v28 = shl i32 %v27, 16
%v29 = ashr exact i32 %v28, 16
%v30 = getelementptr inbounds i16, ptr %a3, i32 %v21
%v31 = load i16, ptr %v30, align 2
%v32 = sext i16 %v31 to i32
%v33 = tail call i32 @llvm.hexagon.M2.mpy.sat.ll.s1(i32 %v29, i32 %v32)
%v34 = tail call i32 @llvm.hexagon.M2.hmmpyl.s1(i32 %v33, i32 %v29)
%v35 = tail call i32 @llvm.hexagon.S2.asr.r.r.sat(i32 %v34, i32 10)
%v36 = tail call i32 @llvm.hexagon.A2.addsat(i32 %v20, i32 %v35)
%v37 = add i32 %v21, 1
%v38 = getelementptr inbounds i16, ptr %v18, i32 2
%v39 = icmp eq i32 %v37, 3
br i1 %v39, label %b4, label %b3
b4: ; preds = %b3
%v40 = tail call i32 @llvm.hexagon.A2.subsat(i32 %v36, i32 %v5)
%v41 = icmp slt i32 %v40, 0
br i1 %v41, label %b5, label %b6
b5: ; preds = %b4
%v42 = tail call i32 @llvm.hexagon.A2.addsat(i32 %v36, i32 0)
br label %b6
b6: ; preds = %b5, %b4
%v43 = phi i16 [ %v6, %b5 ], [ %v7, %b4 ]
%v44 = phi i32 [ %v42, %b5 ], [ %v5, %b4 ]
%v45 = add i16 %v6, 1
%v46 = icmp eq i16 %v45, %a5
br i1 %v46, label %b7, label %b2
b7: ; preds = %b6, %b0
%v47 = phi i16 [ 0, %b0 ], [ %v43, %b6 ]
ret i16 %v47
}
; Function Attrs: nounwind readnone
declare i32 @llvm.hexagon.A2.subh.l16.sat.ll(i32, i32) #1
; Function Attrs: nounwind readnone
declare i32 @llvm.hexagon.M2.mpy.sat.ll.s1(i32, i32) #1
; Function Attrs: nounwind readnone
declare i32 @llvm.hexagon.M2.hmmpyl.s1(i32, i32) #1
; Function Attrs: nounwind readnone
declare i32 @llvm.hexagon.S2.asr.r.r.sat(i32, i32) #1
; Function Attrs: nounwind readnone
declare i32 @llvm.hexagon.A2.addsat(i32, i32) #1
; Function Attrs: nounwind readnone
declare i32 @llvm.hexagon.A2.subsat(i32, i32) #1
attributes #0 = { nounwind readonly "target-cpu"="hexagonv60" }
attributes #1 = { nounwind readnone }
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