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35 lines
1.4 KiB
LLVM
35 lines
1.4 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-count=4 | FileCheck %s
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; RUN: opt < %s -S -passes=loop-unroll -unroll-runtime=true -unroll-count=4 | FileCheck %s
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;; Check that the remainder loop is properly assigned a branch weight for its latch branch.
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; CHECK-LABEL: @test(
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; CHECK-LABEL: for.body:
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; CHECK: br i1 [[COND1:%.*]], label %for.end.loopexit.unr-lcssa.loopexit, label %for.body, !prof ![[#PROF:]], !llvm.loop ![[#LOOP:]]
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; CHECK-LABEL: for.body.epil:
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; CHECK: br i1 [[COND2:%.*]], label %for.body.epil, label %for.end.loopexit.epilog-lcssa, !prof ![[#PROF2:]], !llvm.loop ![[#LOOP2:]]
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; CHECK: ![[#PROF]] = !{!"branch_weights", i32 1, i32 9999}
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; CHECK: ![[#PROF2]] = !{!"branch_weights", i32 3, i32 1}
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define i3 @test(i3* %a, i3 %n) {
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entry:
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%cmp1 = icmp eq i3 %n, 0
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br i1 %cmp1, label %for.end, label %for.body
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for.body:
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%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
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%sum.02 = phi i3 [ %add, %for.body ], [ 0, %entry ]
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%arrayidx = getelementptr inbounds i3, i3* %a, i64 %indvars.iv
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%0 = load i3, i3* %arrayidx
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%add = add nsw i3 %0, %sum.02
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%indvars.iv.next = add i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv.next to i3
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%exitcond = icmp eq i3 %lftr.wideiv, %n
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br i1 %exitcond, label %for.end, label %for.body, !prof !0
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for.end:
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%sum.0.lcssa = phi i3 [ 0, %entry ], [ %add, %for.body ]
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ret i3 %sum.0.lcssa
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}
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!0 = !{!"branch_weights", i32 1, i32 9999}
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