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author | Andrew Trick <atrick@apple.com> | 2011-10-04 00:07:02 +0000 |
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committer | Andrew Trick <atrick@apple.com> | 2011-10-04 00:07:02 +0000 |
commit | d974ea22a5b569e1e21d10332152093372cb6f60 (patch) | |
tree | 4a474dc5dc9236af5b4e3f26af5a0db038dd4b98 /test/Transforms/LoopUnroll/2011-10-01-NoopTrunc.ll | |
parent | 3207e6c6b78dfe5299cb47c6d04d3ea76dbd0e6d (diff) | |
download | external_llvm-d974ea22a5b569e1e21d10332152093372cb6f60.zip external_llvm-d974ea22a5b569e1e21d10332152093372cb6f60.tar.gz external_llvm-d974ea22a5b569e1e21d10332152093372cb6f60.tar.bz2 |
Unit test for r140919, loop unroll heuristics.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141049 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/LoopUnroll/2011-10-01-NoopTrunc.ll')
-rw-r--r-- | test/Transforms/LoopUnroll/2011-10-01-NoopTrunc.ll | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/test/Transforms/LoopUnroll/2011-10-01-NoopTrunc.ll b/test/Transforms/LoopUnroll/2011-10-01-NoopTrunc.ll new file mode 100644 index 0000000..7fb471e --- /dev/null +++ b/test/Transforms/LoopUnroll/2011-10-01-NoopTrunc.ll @@ -0,0 +1,36 @@ +; RUN: opt < %s -S -loop-unroll -unroll-threshold=150 | FileCheck %s +; +; Verify that trunc i64 to i32 is considered free by loop unrolling +; heuristics when i32 is a native type. +; This should result in full unrolling this loop with size=7, TC=19. +; If the trunc were not free we would have 8*19=152 > 150. + +target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64" + +; Check that for.body was unrolled 19 times. +; CHECK: @test +; CHECK: %0 = load +; CHECK: %conv = sext i8 %0 to i32 +; CHECK: %add.1 = add nsw i32 %conv.1, %conv +; CHECK: %add.18 = add nsw i32 %conv.18, %add.17 +; CHECK: ret i32 %add.18 +define i32 @test(i8* %arr) nounwind uwtable readnone { +entry: + br label %for.body + +for.body: ; preds = %for.body, %entry + %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] + %sum.02 = phi i32 [ 0, %entry ], [ %add, %for.body ] + %arrayidx = getelementptr inbounds i8* %arr, i64 %indvars.iv + %0 = load i8* %arrayidx, align 1 + %conv = sext i8 %0 to i32 + %add = add nsw i32 %conv, %sum.02 + %indvars.iv.next = add i64 %indvars.iv, 1 + %lftr.wideiv1 = trunc i64 %indvars.iv.next to i32 + %exitcond2 = icmp eq i32 %lftr.wideiv1, 19 + br i1 %exitcond2, label %for.end, label %for.body + +for.end: ; preds = %for.body + %add.lcssa = phi i32 [ %add, %for.body ] + ret i32 %add.lcssa +} |