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| author | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-05-22 16:54:56 +0000 |
|---|---|---|
| committer | Arnold Schwaighofer <aschwaighofer@apple.com> | 2013-05-22 16:54:56 +0000 |
| commit | 6e4a9c14f6e59b075b3a24825d2dc7dc9e163281 (patch) | |
| tree | cfe715d8604c457897c24961d877ec5086e4041c /test/Transforms | |
| parent | 812789dd3d496420b31e3ee61d5d52303e385101 (diff) | |
| download | llvm-6e4a9c14f6e59b075b3a24825d2dc7dc9e163281.tar.gz llvm-6e4a9c14f6e59b075b3a24825d2dc7dc9e163281.tar.bz2 llvm-6e4a9c14f6e59b075b3a24825d2dc7dc9e163281.tar.xz | |
LoopVectorize: Make Value pointers that could be RAUW'ed a VH
The Value pointers we store in the induction variable list can be RAUW'ed by a
call to SCEVExpander::expandCodeFor, use a TrackingVH instead. Do the same thing
in some other places where we store pointers that could potentially be RAUW'ed.
Fixes PR16073.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182485 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms')
| -rw-r--r-- | test/Transforms/LoopVectorize/value-ptr-bug.ll | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/test/Transforms/LoopVectorize/value-ptr-bug.ll b/test/Transforms/LoopVectorize/value-ptr-bug.ll new file mode 100644 index 0000000000..f376656f07 --- /dev/null +++ b/test/Transforms/LoopVectorize/value-ptr-bug.ll @@ -0,0 +1,50 @@ +; RUN: opt -S -loop-vectorize -force-vector-width=4 -force-vector-unroll=1 -dce -instcombine < %s | FileCheck %s + +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-S128" + +; PR16073 + +; Because we were caching value pointers accross a function call that could RAUW +; we would generate an undefined value store below: +; SCEVExpander::expandCodeFor would change a value (the start value of an +; induction) that we cached in the induction variable list. + +; CHECK: test_vh +; CHECK-NOT: store <4 x i8> undef + +define void @test_vh(i32* %ptr265, i32* %ptr266, i32 %sub267) { +entry: + br label %loop + +loop: + %inc = phi i32 [ %sub267, %entry ], [ %add, %loop] + %ext.inc = sext i32 %inc to i64 + %add.ptr265 = getelementptr inbounds i32* %ptr265, i64 %ext.inc + %add.ptr266 = getelementptr inbounds i32* %ptr266, i64 %ext.inc + %add = add i32 %inc, 9 + %cmp = icmp slt i32 %add, 140 + br i1 %cmp, label %block1, label %loop + +block1: + %sub267.lcssa = phi i32 [ %add, %loop ] + %add.ptr266.lcssa = phi i32* [ %add.ptr266, %loop ] + %add.ptr265.lcssa = phi i32* [ %add.ptr265, %loop ] + %tmp29 = bitcast i32* %add.ptr265.lcssa to i8* + %tmp30 = bitcast i32* %add.ptr266.lcssa to i8* + br label %do.body272 + +do.body272: + %row_width.5 = phi i32 [ %sub267.lcssa, %block1 ], [ %dec, %do.body272 ] + %sp.4 = phi i8* [ %tmp30, %block1 ], [ %incdec.ptr273, %do.body272 ] + %dp.addr.4 = phi i8* [ %tmp29, %block1 ], [ %incdec.ptr274, %do.body272 ] + %incdec.ptr273 = getelementptr inbounds i8* %sp.4, i64 1 + %tmp31 = load i8* %sp.4, align 1 + %incdec.ptr274 = getelementptr inbounds i8* %dp.addr.4, i64 1 + store i8 %tmp31, i8* %dp.addr.4, align 1 + %dec = add i32 %row_width.5, -1 + %cmp276 = icmp eq i32 %dec, 0 + br i1 %cmp276, label %loop.exit, label %do.body272 + +loop.exit: + ret void +} |