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Runtime unrollng will introduce a runtime check in loop prologue. If the unrolled loop is a inner loop, then the proglogue will be inside the outer loop. LICM pass can help to promote the runtime check out if the checked value is loop invariant. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231630 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1001 B
LLVM
44 lines
1001 B
LLVM
; RUN: opt < %s -S -O2 -unroll-runtime=true | FileCheck %s
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; Check runtime unrolling prologue can be promoted by LICM pass.
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; CHECK: entry:
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; CHECK: %xtraiter
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; CHECK: %lcmp.mod
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; CHECK: loop1:
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; CHECK: br i1 %lcmp.mod
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; CHECK: loop2.prol:
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define void @unroll(i32 %iter, i32* %addr1, i32* %addr2) nounwind {
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entry:
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br label %loop1
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loop1:
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%iv1 = phi i32 [ 0, %entry ], [ %inc1, %loop1.latch ]
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%offset1 = getelementptr i32, i32* %addr1, i32 %iv1
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store i32 %iv1, i32* %offset1, align 4
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br label %loop2.header
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loop2.header:
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br label %loop2
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loop2:
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%iv2 = phi i32 [ 0, %loop2.header ], [ %inc2, %loop2 ]
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%offset2 = getelementptr i32, i32* %addr2, i32 %iv2
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store i32 %iv2, i32* %offset2, align 4
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%inc2 = add i32 %iv2, 1
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%exitcnd2 = icmp uge i32 %inc2, %iter
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br i1 %exitcnd2, label %exit2, label %loop2
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exit2:
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br label %loop1.latch
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loop1.latch:
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%inc1 = add i32 %iv1, 1
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%exitcnd1 = icmp uge i32 %inc1, 1024
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br i1 %exitcnd1, label %exit, label %loop1
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exit:
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ret void
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}
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