forked from OSchip/llvm-project
86 lines
3.3 KiB
LLVM
86 lines
3.3 KiB
LLVM
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; PR23524
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; The test is to check redundency produced by loop unroll pass
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; should be cleaned up by later pass.
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; RUN: opt < %s -O2 -S | FileCheck %s
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; After loop unroll:
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; %dec18 = add nsw i32 %dec18.in, -1
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; ...
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; %dec18.1 = add nsw i32 %dec18, -1
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; should be merged to:
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; %dec18.1 = add nsw i32 %dec18.in, -2
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;
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; CHECK-LABEL: @_Z3fn1v(
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; CHECK: %dec18.1 = add nsw i32 %dec18.in, -2
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; ModuleID = '<stdin>'
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target triple = "x86_64-unknown-linux-gnu"
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@b = global i32 0, align 4
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@c = global i32 0, align 4
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; Function Attrs: nounwind uwtable
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define void @_Z3fn1v() #0 {
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entry:
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%tmp = load i32, i32* @b, align 4
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%tobool20 = icmp eq i32 %tmp, 0
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br i1 %tobool20, label %for.end6, label %for.body.lr.ph
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for.body.lr.ph: ; preds = %entry
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br label %for.body
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for.cond1.for.cond.loopexit_crit_edge: ; preds = %for.inc
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%add.ptr.lcssa = phi i16* [ %add.ptr, %for.inc ]
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%incdec.ptr.lcssa = phi i8* [ %incdec.ptr, %for.inc ]
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br label %for.cond.loopexit
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for.cond.loopexit: ; preds = %for.body, %for.cond1.for.cond.loopexit_crit_edge
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%r.1.lcssa = phi i16* [ %add.ptr.lcssa, %for.cond1.for.cond.loopexit_crit_edge ], [ %r.022, %for.body ]
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%a.1.lcssa = phi i8* [ %incdec.ptr.lcssa, %for.cond1.for.cond.loopexit_crit_edge ], [ %a.021, %for.body ]
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%tmp1 = load i32, i32* @b, align 4
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%tobool = icmp eq i32 %tmp1, 0
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br i1 %tobool, label %for.cond.for.end6_crit_edge, label %for.body
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for.body: ; preds = %for.cond.loopexit, %for.body.lr.ph
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%r.022 = phi i16* [ undef, %for.body.lr.ph ], [ %r.1.lcssa, %for.cond.loopexit ]
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%a.021 = phi i8* [ undef, %for.body.lr.ph ], [ %a.1.lcssa, %for.cond.loopexit ]
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%tmp2 = load i32, i32* @c, align 4
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%tobool215 = icmp eq i32 %tmp2, 0
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br i1 %tobool215, label %for.cond.loopexit, label %for.body3.lr.ph
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for.body3.lr.ph: ; preds = %for.body
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br label %for.body3
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for.body3: ; preds = %for.inc, %for.body3.lr.ph
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%dec18.in = phi i32 [ %tmp2, %for.body3.lr.ph ], [ %dec18, %for.inc ]
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%r.117 = phi i16* [ %r.022, %for.body3.lr.ph ], [ %add.ptr, %for.inc ]
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%a.116 = phi i8* [ %a.021, %for.body3.lr.ph ], [ %incdec.ptr, %for.inc ]
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%dec18 = add nsw i32 %dec18.in, -1
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%tmp3 = load i8, i8* %a.116, align 1
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%cmp = icmp eq i8 %tmp3, 0
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br i1 %cmp, label %if.then, label %for.inc
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if.then: ; preds = %for.body3
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%arrayidx = getelementptr inbounds i16, i16* %r.117, i64 1
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store i16 0, i16* %arrayidx, align 2
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store i16 0, i16* %r.117, align 2
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%arrayidx5 = getelementptr inbounds i16, i16* %r.117, i64 2
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store i16 0, i16* %arrayidx5, align 2
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br label %for.inc
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for.inc: ; preds = %if.then, %for.body3
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%incdec.ptr = getelementptr inbounds i8, i8* %a.116, i64 1
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%add.ptr = getelementptr inbounds i16, i16* %r.117, i64 3
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%tobool2 = icmp eq i32 %dec18, 0
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br i1 %tobool2, label %for.cond1.for.cond.loopexit_crit_edge, label %for.body3, !llvm.loop !0
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for.cond.for.end6_crit_edge: ; preds = %for.cond.loopexit
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br label %for.end6
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for.end6: ; preds = %for.cond.for.end6_crit_edge, %entry
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ret void
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}
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!0 = !{!0, !1}
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!1 = !{!"llvm.loop.unroll.count", i32 2}
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