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| author | Florian Hahn <florian.hahn@arm.com> | 2016-12-19 17:13:37 +0000 |
|---|---|---|
| committer | Florian Hahn <florian.hahn@arm.com> | 2016-12-19 17:13:37 +0000 |
| commit | 2e03213f90b0c443a4f3415757e8893d70420a85 (patch) | |
| tree | cee22297bbbc2d12448cce13934cf6c33b1ce644 /llvm/test/Transforms/LoopVersioning/exit-block-dominates-rt-check-block.ll | |
| parent | 17cb7c0a2a40151960d5e105bd2b7d9772c97086 (diff) | |
| download | bcm5719-llvm-2e03213f90b0c443a4f3415757e8893d70420a85.tar.gz bcm5719-llvm-2e03213f90b0c443a4f3415757e8893d70420a85.zip | |
[LoopVersioning] Require loop-simplify form for loop versioning.
Summary:
Requiring loop-simplify form for loop versioning ensures that the
runtime check block always dominates the exit block.
This patch closes #30958 (https://llvm.org/bugs/show_bug.cgi?id=30958).
Reviewers: silviu.baranga, hfinkel, anemet, ashutosh.nema
Subscribers: ashutosh.nema, mzolotukhin, efriedma, hfinkel, llvm-commits
Differential Revision: https://reviews.llvm.org/D27469
llvm-svn: 290116
Diffstat (limited to 'llvm/test/Transforms/LoopVersioning/exit-block-dominates-rt-check-block.ll')
| -rw-r--r-- | llvm/test/Transforms/LoopVersioning/exit-block-dominates-rt-check-block.ll | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/llvm/test/Transforms/LoopVersioning/exit-block-dominates-rt-check-block.ll b/llvm/test/Transforms/LoopVersioning/exit-block-dominates-rt-check-block.ll new file mode 100644 index 00000000000..51bfb28bdb1 --- /dev/null +++ b/llvm/test/Transforms/LoopVersioning/exit-block-dominates-rt-check-block.ll @@ -0,0 +1,38 @@ +; This test ensures loop versioning does not produce an invalid dominator tree +; if the exit block of the loop (bb0) dominates the runtime check block +; (bb1 will become the runtime check block). + +; RUN: opt -loop-distribute -verify-dom-info -S -o - %s > %t +; RUN: opt -loop-simplify -loop-distribute -verify-dom-info -S -o - %s > %t +; RUN: FileCheck --check-prefix CHECK-VERSIONING -input-file %t %s + +; RUN: opt -loop-versioning -verify-dom-info -S -o - %s > %t +; RUN: opt -loop-simplify -loop-versioning -verify-dom-info -S -o - %s > %t +; RUN: FileCheck --check-prefix CHECK-VERSIONING -input-file %t %s + +@c1 = external global i16 + +define void @f(i16 %a) { + br label %bb0 + +bb0: + br label %bb1 + +bb1: + %tmp1 = load i16, i16* @c1 + br label %bb2 + +bb2: + %tmp2 = phi i16 [ %tmp1, %bb1 ], [ %tmp3, %bb2 ] + %tmp4 = getelementptr inbounds [1 x i32], [1 x i32]* undef, i32 0, i32 4 + store i32 1, i32* %tmp4 + %tmp5 = getelementptr inbounds [1 x i32], [1 x i32]* undef, i32 0, i32 9 + store i32 0, i32* %tmp5 + %tmp3 = add i16 %tmp2, 1 + store i16 %tmp2, i16* @c1 + %tmp6 = icmp sle i16 %tmp3, 0 + br i1 %tmp6, label %bb2, label %bb0 +} + +; Simple check to make sure loop versioning happened. +; CHECK-VERSIONING: bb2.lver.check: |
