45 lines
1.4 KiB
LLVM
45 lines
1.4 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-threshold=50 | FileCheck %s
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; Make sure this loop is completely unrolled...
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; CHECK-LABEL: @test1
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; CHECK: for.body:
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; CHECK-NOT: for.end:
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define i32 @test1(i32* nocapture %a) nounwind uwtable readonly {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%sum.01 = phi i32 [ 0, %entry ], [ %add, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%0 = load i32, i32* %arrayidx, align 4
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; This loop will be completely unrolled, even with these extra instructions,
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; but only because they're ephemeral (and, thus, free).
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%1 = add nsw i32 %0, 2
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%2 = add nsw i32 %1, 4
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%3 = add nsw i32 %2, 4
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%4 = add nsw i32 %3, 4
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%5 = add nsw i32 %4, 4
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%6 = add nsw i32 %5, 4
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%7 = add nsw i32 %6, 4
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%8 = add nsw i32 %7, 4
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%9 = add nsw i32 %8, 4
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%10 = add nsw i32 %9, 4
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%ca = icmp sgt i32 %10, -7
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call void @llvm.assume(i1 %ca)
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%add = add nsw i32 %0, %sum.01
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i32
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%exitcond = icmp eq i32 %lftr.wideiv, 5
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret i32 %add
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}
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declare void @llvm.assume(i1) nounwind
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