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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
28 lines
796 B
LLVM
28 lines
796 B
LLVM
; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output \
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; RUN: -scalar-evolution-max-iterations=0 | \
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; RUN: grep -F "backedge-taken count is (-1 + (-1 * %j))"
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; PR2607
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define i32 @_Z1aj(i32 %j) nounwind {
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entry:
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icmp sgt i32 0, %j ; <i1>:0 [#uses=1]
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br i1 %0, label %bb.preheader, label %return
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bb.preheader: ; preds = %entry
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br label %bb
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bb: ; preds = %bb, %bb.preheader
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%i.01 = phi i32 [ %1, %bb ], [ 0, %bb.preheader ] ; <i32> [#uses=1]
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add i32 %i.01, -1 ; <i32>:1 [#uses=3]
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icmp sgt i32 %1, %j ; <i1>:2 [#uses=1]
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br i1 %2, label %bb, label %return.loopexit
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return.loopexit: ; preds = %bb
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br label %return
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return: ; preds = %return.loopexit, %entry
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%i.0.lcssa = phi i32 [ 0, %entry ], [ %1, %return.loopexit ] ; <i32> [#uses=1]
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ret i32 %i.0.lcssa
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}
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