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