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; RUN: llc %s -mcpu=core2 -o - | FileCheck %s
; This test was failing while tracking the liveness in the register scavenger
; during the branching folding pass. The allocation of the subregisters was
; incorrect.
; I.e., the faulty pattern looked like:
; CH = movb 64
; ECX = movl 3 <- CH was killed here.
; CH = subb CH, ...
;
; This reduced test case triggers the crash before the fix, but does not
; strictly speaking check that the resulting code is correct.
; To check that the code is actually correct we would need to check the
; liveness of the produced code.
;
; Currently, we check that after ECX = movl 3, we do not have subb CH,
; whereas CH could have been redefine in between and that would have been
; totally fine.
; <rdar://problem/16582185>
target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128"
target triple = "i386-apple-macosx10.9"
%struct.A = type { %struct.B, %struct.C, %struct.D*, [1 x i8*] }
%struct.B = type { i32, [4 x i8] }
%struct.C = type { i128 }
%struct.D = type { {}*, [0 x i32] }
%union.E = type { i32 }
; CHECK-LABEL: __XXX1:
; CHECK: movl $3, %ecx
; CHECK-NOT: subb %{{[a-z]+}}, %ch
; Function Attrs: nounwind optsize ssp
define fastcc void @__XXX1(%struct.A* %ht) #0 {
entry:
%const72 = bitcast i128 72 to i128
%const3 = bitcast i128 3 to i128
switch i32 undef, label %if.end196 [
i32 1, label %sw.bb.i
i32 3, label %sw.bb2.i
]
sw.bb.i: ; preds = %entry
%call.i.i.i = tail call i32 undef(%struct.A* %ht, i8 zeroext 22, i32 undef, i32 0, %struct.D* undef)
%bf.load.i.i = load i128* undef, align 4
%bf.lshr.i.i = lshr i128 %bf.load.i.i, %const72
%shl1.i.i = shl nuw nsw i128 %bf.lshr.i.i, 8
%shl.i.i = trunc i128 %shl1.i.i to i32
br i1 undef, label %cond.false10.i.i, label %__XXX2.exit.i.i
__XXX2.exit.i.i: ; preds = %sw.bb.i
%extract11.i.i.i = lshr i128 %bf.load.i.i, %const3
%extract.t12.i.i.i = trunc i128 %extract11.i.i.i to i32
%bf.cast7.i.i.i = and i32 %extract.t12.i.i.i, 3
%arrayidx.i.i.i = getelementptr inbounds %struct.A* %ht, i32 0, i32 3, i32 %bf.cast7.i.i.i
br label %cond.end12.i.i
cond.false10.i.i: ; preds = %sw.bb.i
%arrayidx.i6.i.i = getelementptr inbounds %struct.A* %ht, i32 0, i32 3, i32 0
br label %cond.end12.i.i
cond.end12.i.i: ; preds = %cond.false10.i.i, %__XXX2.exit.i.i
%.sink.in.i.i = phi i8** [ %arrayidx.i.i.i, %__XXX2.exit.i.i ], [ %arrayidx.i6.i.i, %cond.false10.i.i ]
%.sink.i.i = load i8** %.sink.in.i.i, align 4
%tmp = bitcast i8* %.sink.i.i to %union.E*
br i1 undef, label %for.body.i.i, label %if.end196
for.body.i.i: ; preds = %for.body.i.i, %cond.end12.i.i
%weak.i.i = getelementptr inbounds %union.E* %tmp, i32 undef, i32 0
%tmp1 = load i32* %weak.i.i, align 4
%cmp36.i.i = icmp ne i32 %tmp1, %shl.i.i
%or.cond = and i1 %cmp36.i.i, false
br i1 %or.cond, label %for.body.i.i, label %if.end196
sw.bb2.i: ; preds = %entry
%bf.lshr.i85.i = lshr i128 undef, %const72
br i1 undef, label %if.end196, label %__XXX2.exit.i95.i
__XXX2.exit.i95.i: ; preds = %sw.bb2.i
%extract11.i.i91.i = lshr i128 undef, %const3
br label %if.end196
if.end196: ; preds = %__XXX2.exit.i95.i, %sw.bb2.i, %for.body.i.i, %cond.end12.i.i, %entry
ret void
}
attributes #0 = { nounwind optsize ssp "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" }
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