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c62339e54c
The patch is to fix the bug in PR28705. It was caused by setting wrong return value for SCEVExpander::findExistingExpansion. The return values of findExistingExpansion have different meanings when the function is used in different ways so it is easy to make mistake. The fix creates two new interfaces to replace SCEVExpander::findExistingExpansion, and specifies where each interface is expected to be used. Differential Revision: https://reviews.llvm.org/D22942 llvm-svn: 278161
42 lines
1.3 KiB
LLVM
42 lines
1.3 KiB
LLVM
; PR28705
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; RUN: opt < %s -indvars -S | FileCheck %s
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; Check IndVarSimplify replaces the exitval use of the induction var "%inc.i.i"
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; with "%.sroa.speculated + 1".
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;
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; CHECK-LABEL: @foo(
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; CHECK: %[[EXIT:.+]] = sub i32 %.sroa.speculated, -1
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; CHECK: %DB.sroa.9.0.lcssa = phi i32 [ 1, %entry ], [ %[[EXIT]], %loopexit ]
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;
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define void @foo(i32 %sub.ptr.div.i, i8* %ref.i1174) local_unnamed_addr {
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entry:
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%cmp.i1137 = icmp ugt i32 %sub.ptr.div.i, 3
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%.sroa.speculated = select i1 %cmp.i1137, i32 3, i32 %sub.ptr.div.i
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%cmp6483126 = icmp eq i32 %.sroa.speculated, 0
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br i1 %cmp6483126, label %XZ.exit, label %for.body650.lr.ph
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for.body650.lr.ph:
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br label %for.body650
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loopexit:
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%inc.i.i.lcssa = phi i32 [ %inc.i.i, %for.body650 ]
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br label %XZ.exit
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XZ.exit:
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%DB.sroa.9.0.lcssa = phi i32 [ 1, %entry ], [ %inc.i.i.lcssa, %loopexit ]
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br label %end
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for.body650:
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%iv = phi i32 [ 0, %for.body650.lr.ph ], [ %inc655, %for.body650 ]
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%iv2 = phi i32 [ 1, %for.body650.lr.ph ], [ %inc.i.i, %for.body650 ]
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%arrayidx.i.i1105 = getelementptr inbounds i8, i8* %ref.i1174, i32 %iv2
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store i8 7, i8* %arrayidx.i.i1105, align 1
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%inc.i.i = add i32 %iv2, 1
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%inc655 = add i32 %iv, 1
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%cmp648 = icmp eq i32 %inc655, %.sroa.speculated
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br i1 %cmp648, label %loopexit, label %for.body650
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end:
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ret void
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}
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