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ba51722072
Differential Revision: http://reviews.llvm.org/D27004 From: Evgeny Stupachenko <evstupac@gmail.com> llvm-svn: 296962
66 lines
2.3 KiB
LLVM
66 lines
2.3 KiB
LLVM
; RUN: opt -S -loop-unroll -unroll-runtime < %s | FileCheck %s
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; Epilog unroll allows to keep PHI constant value.
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; For the test this means that after unroll XOR could be deleted.
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; Check that we do epilogue reminder here.
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; CHECK-LABEL: const_phi_val
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; CHECK: for.body.epil
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; Function Attrs: norecurse nounwind uwtable
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define void @const_phi_val(i32 %i0, i32* nocapture %a) {
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entry:
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%cmp6 = icmp slt i32 %i0, 1000
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br i1 %cmp6, label %for.body.preheader, label %for.end
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for.body.preheader: ; preds = %entry
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%tmp = sext i32 %i0 to i64
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br label %for.body
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for.body: ; preds = %for.body, %for.body.preheader
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%indvars.iv = phi i64 [ %tmp, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
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%s.08 = phi i32 [ 0, %for.body.preheader ], [ %xor, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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store i32 %s.08, i32* %arrayidx, align 4
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%xor = xor i32 %s.08, 1
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%indvars.iv.next = add nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 1000
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit: ; preds = %for.body
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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ret void
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}
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; When there is no phi with const coming from preheader,
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; there is no need to do epilogue unrolling.
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; CHECK-LABEL: var_phi_val
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; CHECK: for.body.prol
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; Function Attrs: norecurse nounwind uwtable
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define void @var_phi_val(i32 %i0, i32* nocapture %a) {
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entry:
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%cmp6 = icmp slt i32 %i0, 1000
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br i1 %cmp6, label %for.body.preheader, label %for.end
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for.body.preheader: ; preds = %entry
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%tmp = sext i32 %i0 to i64
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br label %for.body
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for.body: ; preds = %for.body, %for.body.preheader
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%indvars.iv = phi i64 [ %tmp, %for.body.preheader ], [ %indvars.iv.next, %for.body ]
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%arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
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%indvars.iv.next = add nsw i64 %indvars.iv, 1
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%exitcond = icmp eq i64 %indvars.iv.next, 1000
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br i1 %exitcond, label %for.end.loopexit, label %for.body
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for.end.loopexit: ; preds = %for.body
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br label %for.end
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for.end: ; preds = %for.end.loopexit, %entry
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ret void
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}
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