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46bdfb0e6b
to more accurately describe what it does. Expand its doxygen comment to describe what the backedge-taken count is and how it differs from the actual iteration count of the loop. Adjust names and comments in associated code accordingly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65382 91177308-0d34-0410-b5e6-96231b3b80d8
31 lines
1.0 KiB
LLVM
31 lines
1.0 KiB
LLVM
; RUN: llvm-as < %s | opt -scalar-evolution -analyze | grep {Loop bb: backedge-taken count is (-1 + (-1 \\* %x) + %y)}
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; PR1597
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define i32 @f(i32 %x, i32 %y) {
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entry:
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%tmp63 = icmp ult i32 %x, %y ; <i1> [#uses=1]
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br i1 %tmp63, label %bb.preheader, label %bb8
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bb.preheader: ; preds = %entry
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br label %bb
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bb: ; preds = %bb3, %bb.preheader
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%x_addr.0 = phi i32 [ %tmp2, %bb3 ], [ %x, %bb.preheader ] ; <i32> [#uses=1]
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%tmp2 = add i32 %x_addr.0, 1 ; <i32> [#uses=3]
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br label %bb3
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bb3: ; preds = %bb
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%tmp6 = icmp ult i32 %tmp2, %y ; <i1> [#uses=1]
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br i1 %tmp6, label %bb, label %bb8.loopexit
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bb8.loopexit: ; preds = %bb3
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br label %bb8
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bb8: ; preds = %bb8.loopexit, %entry
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%x_addr.1 = phi i32 [ %x, %entry ], [ %tmp2, %bb8.loopexit ] ; <i32> [#uses=1]
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br label %return
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return: ; preds = %bb8
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ret i32 %x_addr.1
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}
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