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d8e706d6b0
Most IMPLICIT_DEF instructions are removed by the ProcessImplicitDefs pass, and a few are reinserted by PHIElimination when a PHI argument is <undef>. RegisterCoalescer was assuming that all IMPLICIT_DEF live ranges look like those created by PHIElimination, and that their live range never leaves the basic block. The PR14732 test case does tricks with PHI nodes that causes a longer IMPLICIT_DEF live range to appear. This happens very rarely, but RegisterCoalescer should be able to handle it. llvm-svn: 171435
131 lines
5.8 KiB
LLVM
131 lines
5.8 KiB
LLVM
; RUN: llc < %s -verify-coalescing
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; PR14732
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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"
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target triple = "x86_64-apple-macosx10"
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@c = common global i32 0, align 4
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@b = common global i32 0, align 4
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@a = common global i32 0, align 4
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@d = common global i32 0, align 4
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; This function creates an IMPLICIT_DEF with a long live range, even after
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; ProcessImplicitDefs.
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;
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; The coalescer should be able to deal with all kinds of IMPLICIT_DEF live
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; ranges, even if they are not common.
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define void @f() nounwind uwtable ssp {
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entry:
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%i = alloca i32, align 4
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br label %for.cond
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for.cond: ; preds = %for.inc34, %entry
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%i.0.load44 = phi i32 [ %inc35, %for.inc34 ], [ undef, %entry ]
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%pi.0 = phi i32* [ %pi.4, %for.inc34 ], [ undef, %entry ]
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%tobool = icmp eq i32 %i.0.load44, 0
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br i1 %tobool, label %for.end36, label %for.body
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for.body: ; preds = %for.cond
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store i32 0, i32* @c, align 4, !tbaa !0
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br label %for.body2
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for.body2: ; preds = %for.body, %for.inc
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%i.0.load45 = phi i32 [ %i.0.load44, %for.body ], [ 0, %for.inc ]
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%tobool3 = icmp eq i32 %i.0.load45, 0
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br i1 %tobool3, label %if.then10, label %if.then
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if.then: ; preds = %for.body2
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store i32 0, i32* %i, align 4, !tbaa !0
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br label %for.body6
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for.body6: ; preds = %if.then, %for.body6
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store i32 0, i32* %i, align 4
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br i1 true, label %for.body6, label %for.inc
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if.then10: ; preds = %for.body2
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store i32 1, i32* @b, align 4, !tbaa !0
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ret void
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for.inc: ; preds = %for.body6
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br i1 undef, label %for.body2, label %if.end30
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while.condthread-pre-split: ; preds = %label.loopexit, %while.condthread-pre-split.lr.ph.lr.ph, %for.inc27.backedge
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%0 = phi i32 [ %inc28, %for.inc27.backedge ], [ %inc285863, %while.condthread-pre-split.lr.ph.lr.ph ], [ %inc2858, %label.loopexit ]
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%inc2060 = phi i32 [ %inc20, %for.inc27.backedge ], [ %a.promoted.pre, %while.condthread-pre-split.lr.ph.lr.ph ], [ %inc20, %label.loopexit ]
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br label %while.cond
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while.cond: ; preds = %while.condthread-pre-split, %while.cond
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%p2.1.in = phi i32* [ %pi.3.ph, %while.cond ], [ %i, %while.condthread-pre-split ]
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%p2.1 = bitcast i32* %p2.1.in to i16*
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br i1 %tobool19, label %while.end, label %while.cond
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while.end: ; preds = %while.cond
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%inc20 = add nsw i32 %inc2060, 1
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%tobool21 = icmp eq i32 %inc2060, 0
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br i1 %tobool21, label %for.inc27.backedge, label %if.then22
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for.inc27.backedge: ; preds = %while.end, %if.then22
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%inc28 = add nsw i32 %0, 1
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store i32 %inc28, i32* @b, align 4, !tbaa !0
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%tobool17 = icmp eq i32 %inc28, 0
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br i1 %tobool17, label %for.inc27.if.end30.loopexit56_crit_edge, label %while.condthread-pre-split
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if.then22: ; preds = %while.end
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%1 = load i16* %p2.1, align 2, !tbaa !3
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%tobool23 = icmp eq i16 %1, 0
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br i1 %tobool23, label %for.inc27.backedge, label %label.loopexit
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label.loopexit: ; preds = %if.then22
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store i32 %inc20, i32* @a, align 4, !tbaa !0
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%inc2858 = add nsw i32 %0, 1
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store i32 %inc2858, i32* @b, align 4, !tbaa !0
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%tobool1759 = icmp eq i32 %inc2858, 0
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br i1 %tobool1759, label %if.end30, label %while.condthread-pre-split
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for.inc27.if.end30.loopexit56_crit_edge: ; preds = %for.inc27.backedge
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store i32 %inc20, i32* @a, align 4, !tbaa !0
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br label %if.end30
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if.end30: ; preds = %for.inc27.if.end30.loopexit56_crit_edge, %label.loopexit, %label.preheader, %for.inc
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%i.0.load46 = phi i32 [ 0, %for.inc ], [ %i.0.load4669, %label.preheader ], [ %i.0.load4669, %label.loopexit ], [ %i.0.load4669, %for.inc27.if.end30.loopexit56_crit_edge ]
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%pi.4 = phi i32* [ %i, %for.inc ], [ %pi.3.ph, %label.preheader ], [ %pi.3.ph, %label.loopexit ], [ %pi.3.ph, %for.inc27.if.end30.loopexit56_crit_edge ]
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%2 = load i32* %pi.4, align 4, !tbaa !0
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%tobool31 = icmp eq i32 %2, 0
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br i1 %tobool31, label %for.inc34, label %label.preheader
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for.inc34: ; preds = %if.end30
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%inc35 = add nsw i32 %i.0.load46, 1
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store i32 %inc35, i32* %i, align 4
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br label %for.cond
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for.end36: ; preds = %for.cond
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store i32 1, i32* %i, align 4
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%3 = load i32* @c, align 4, !tbaa !0
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%tobool37 = icmp eq i32 %3, 0
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br i1 %tobool37, label %label.preheader, label %land.rhs
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land.rhs: ; preds = %for.end36
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store i32 0, i32* @a, align 4, !tbaa !0
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br label %label.preheader
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label.preheader: ; preds = %for.end36, %if.end30, %land.rhs
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%i.0.load4669 = phi i32 [ 1, %land.rhs ], [ %i.0.load46, %if.end30 ], [ 1, %for.end36 ]
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%pi.3.ph = phi i32* [ %pi.0, %land.rhs ], [ %pi.4, %if.end30 ], [ %pi.0, %for.end36 ]
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%4 = load i32* @b, align 4, !tbaa !0
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%inc285863 = add nsw i32 %4, 1
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store i32 %inc285863, i32* @b, align 4, !tbaa !0
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%tobool175964 = icmp eq i32 %inc285863, 0
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br i1 %tobool175964, label %if.end30, label %while.condthread-pre-split.lr.ph.lr.ph
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while.condthread-pre-split.lr.ph.lr.ph: ; preds = %label.preheader
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%.pr50 = load i32* @d, align 4, !tbaa !0
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%tobool19 = icmp eq i32 %.pr50, 0
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%a.promoted.pre = load i32* @a, align 4, !tbaa !0
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br label %while.condthread-pre-split
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}
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!0 = metadata !{metadata !"int", metadata !1}
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!1 = metadata !{metadata !"omnipotent char", metadata !2}
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!2 = metadata !{metadata !"Simple C/C++ TBAA"}
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!3 = metadata !{metadata !"short", metadata !1}
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