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https://github.com/c64scene-ar/llvm-6502.git
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e0f4a11a89
Clean up a predicate I added in r229731, fix the relevant comment and add a test case. The earlier version is confusing to read and was also buggy (probably not a coincidence) till Alexey fixed it in r233881. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234701 91177308-0d34-0410-b5e6-96231b3b80d8
46 lines
1.6 KiB
LLVM
46 lines
1.6 KiB
LLVM
; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-count=16 | FileCheck --check-prefix=UNROLL-16 %s
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; RUN: opt < %s -S -loop-unroll -unroll-runtime=true -unroll-count=4 | FileCheck --check-prefix=UNROLL-4 %s
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; Given that the trip-count of this loop is a 3-bit value, we cannot
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; safely unroll it with a count of anything more than 8.
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define i3 @test(i3* %a, i3 %n) {
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; UNROLL-16-LABEL: @test(
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; UNROLL-4-LABEL: @test(
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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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; UNROLL-16-NOT: for.body.prol:
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; UNROLL-4: for.body.prol:
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for.body: ; preds = %for.body, %entry
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; UNROLL-16-LABEL: for.body:
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; UNROLL-4-LABEL: 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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; UNROLL-16-LABEL: for.body
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; UNROLL-16-LABEL: getelementptr
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; UNROLL-16-LABEL-NOT: getelementptr
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; UNROLL-4-LABEL: getelementptr
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; UNROLL-4-LABEL: getelementptr
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; UNROLL-4-LABEL: getelementptr
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; UNROLL-4-LABEL: getelementptr
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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
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; UNROLL-16-LABEL: for.end
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; UNROLL-4-LABEL: for.end
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for.end: ; preds = %for.body, %entry
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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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