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fd6edef87b
an if statement that guards a loop, to allow indvars to avoid smax operations in more situations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56232 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
751 B
LLVM
36 lines
751 B
LLVM
; RUN: llvm-as < %s | opt -scalar-evolution -analyze | grep {Loop bb3: (-1 + %n) iterations!}
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; We don't want to use a max in the trip count expression in
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; this testcase.
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define void @foo(i32 %n, i32* %p, i32* %q) nounwind {
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entry:
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icmp sgt i32 %n, 0
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br i1 %0, label %bb, label %return
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bb:
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load i32* %q, align 4
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icmp eq i32 %1, 0
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br i1 %2, label %return, label %bb3.preheader
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bb3.preheader:
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br label %bb3
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bb3:
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%i.0 = phi i32 [ %7, %bb3 ], [ 0, %bb3.preheader ]
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getelementptr i32* %p, i32 %i.0
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load i32* %3, align 4
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add i32 %4, 1
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getelementptr i32* %p, i32 %i.0
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store i32 %5, i32* %6, align 4
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add i32 %i.0, 1
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icmp slt i32 %7, %n
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br i1 %8, label %bb3, label %return.loopexit
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return.loopexit:
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br label %return
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return:
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ret void
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}
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