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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
22 lines
672 B
LLVM
22 lines
672 B
LLVM
; RUN: llvm-as < %s | opt -analyze -scalar-evolution \
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; RUN: -scalar-evolution-max-iterations=0 | grep {Loop bb: backedge-taken count is 100}
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; PR1533
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@array = weak global [101 x i32] zeroinitializer, align 32 ; <[100 x i32]*> [#uses=1]
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define void @loop(i32 %x) {
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entry:
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br label %bb
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bb: ; preds = %bb, %entry
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%i.01.0 = phi i32 [ 100, %entry ], [ %tmp4, %bb ] ; <i32> [#uses=2]
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%tmp1 = getelementptr [101 x i32]* @array, i32 0, i32 %i.01.0 ; <i32*> [#uses=1]
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store i32 %x, i32* %tmp1
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%tmp4 = add i32 %i.01.0, -1 ; <i32> [#uses=2]
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%tmp7 = icmp sgt i32 %tmp4, -1 ; <i1> [#uses=1]
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br i1 %tmp7, label %bb, label %return
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return: ; preds = %bb
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ret void
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}
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