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