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; RUN: llc -march=hexagon -enable-pipeliner=false < %s | FileCheck %s
; Check that we generate hardware loop instructions.
; Case 1 : Loop with a constant number of iterations.
; CHECK-LABEL: @hwloop1
; CHECK: loop0(.LBB{{.}}_{{.}},#10)
; CHECK: endloop0
@a = common global [10 x i32] zeroinitializer, align 4
define i32 @hwloop1() nounwind {
entry:
br label %for.body
for.body:
%i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%arrayidx = getelementptr inbounds [10 x i32], [10 x i32]* @a, i32 0, i32 %i.01
store i32 %i.01, i32* %arrayidx, align 4
%inc = add nsw i32 %i.01, 1
%exitcond = icmp eq i32 %inc, 10
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret i32 0
}
; Case 2 : Loop with a run-time number of iterations.
; CHECK-LABEL: @hwloop2
; CHECK: loop0(.LBB{{.}}_{{.}},r{{[0-9]+}})
; CHECK: endloop0
define i32 @hwloop2(i32 %n, i32* nocapture %b) nounwind {
entry:
%cmp1 = icmp sgt i32 %n, 0
br i1 %cmp1, label %for.body.preheader, label %for.end
for.body.preheader:
br label %for.body
for.body:
%a.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
%i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
%0 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %0, %a.03
%inc = add nsw i32 %i.02, 1
%exitcond = icmp eq i32 %inc, %n
br i1 %exitcond, label %for.end.loopexit, label %for.body
for.end.loopexit:
br label %for.end
for.end:
%a.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
ret i32 %a.0.lcssa
}
; Case 3 : Induction variable increment more than 1.
; CHECK-LABEL: @hwloop3
; CHECK: lsr(r{{[0-9]+}},#2)
; CHECK: loop0(.LBB{{.}}_{{.}},r{{[0-9]+}})
; CHECK: endloop0
define i32 @hwloop3(i32 %n, i32* nocapture %b) nounwind {
entry:
%cmp1 = icmp sgt i32 %n, 0
br i1 %cmp1, label %for.body.preheader, label %for.end
for.body.preheader:
br label %for.body
for.body:
%a.03 = phi i32 [ %add, %for.body ], [ 0, %for.body.preheader ]
%i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
%0 = load i32, i32* %arrayidx, align 4
%add = add nsw i32 %0, %a.03
%inc = add nsw i32 %i.02, 4
%exitcond = icmp eq i32 %inc, %n
br i1 %exitcond, label %for.end.loopexit, label %for.body
for.end.loopexit:
br label %for.end
for.end:
%a.0.lcssa = phi i32 [ 0, %entry ], [ %add, %for.end.loopexit ]
ret i32 %a.0.lcssa
}
; Case 4 : Loop exit compare uses register instead of immediate value.
; CHECK-LABEL: @hwloop4
; CHECK: loop0(.LBB{{.}}_{{.}},r{{[0-9]+}})
; CHECK: endloop0
define i32 @hwloop4(i32 %n, i32* nocapture %b) nounwind {
entry:
%cmp1 = icmp sgt i32 %n, 0
br i1 %cmp1, label %for.body.preheader, label %for.end
for.body.preheader:
br label %for.body
for.body:
%i.02 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.02
store i32 %i.02, i32* %arrayidx, align 4
%inc = add nsw i32 %i.02, 1
%exitcond = icmp eq i32 %inc, %n
br i1 %exitcond, label %for.end.loopexit, label %for.body
for.end.loopexit:
br label %for.end
for.end:
ret i32 0
}
; Case 5: After LSR, the initial value is 100 and the iv decrements to 0.
; CHECK-LABEL: @hwloop5
; CHECK: loop0(.LBB{{.}}_{{.}},#100)
; CHECK: endloop0
define void @hwloop5(i32* nocapture %a, i32* nocapture %res) nounwind {
entry:
br label %for.body
for.body:
%i.03 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.03
%0 = load i32, i32* %arrayidx, align 4
%mul = mul nsw i32 %0, %0
%arrayidx2 = getelementptr inbounds i32, i32* %res, i32 %i.03
store i32 %mul, i32* %arrayidx2, align 4
%inc = add nsw i32 %i.03, 1
%exitcond = icmp eq i32 %inc, 100
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}
; Case 6: Large immediate offset
; CHECK-LABEL: @hwloop6
; CHECK-NOT: loop0(.LBB{{.}}_{{.}},#1024)
; CHECK: loop0(.LBB{{.}}_{{.}},r{{[0-9]+}})
; CHECK: endloop0
define void @hwloop6(i32* nocapture %a, i32* nocapture %res) nounwind {
entry:
br label %for.body
for.body:
%i.02 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
%arrayidx = getelementptr inbounds i32, i32* %a, i32 %i.02
%0 = load i32, i32* %arrayidx, align 4
%arrayidx1 = getelementptr inbounds i32, i32* %res, i32 %i.02
store i32 %0, i32* %arrayidx1, align 4
%inc = add nsw i32 %i.02, 1
%exitcond = icmp eq i32 %inc, 1024
br i1 %exitcond, label %for.end, label %for.body
for.end:
ret void
}
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