1 ; RUN: llc %s -mcpu=core2 -o - | FileCheck %s 2 ; This test was failing while tracking the liveness in the register scavenger 3 ; during the branching folding pass. The allocation of the subregisters was 4 ; incorrect. 5 ; I.e., the faulty pattern looked like: 6 ; CH = movb 64 7 ; ECX = movl 3 <- CH was killed here. 8 ; CH = subb CH, ... 9 ; 10 ; This reduced test case triggers the crash before the fix, but does not 11 ; strictly speaking check that the resulting code is correct. 12 ; To check that the code is actually correct we would need to check the 13 ; liveness of the produced code. 14 ; 15 ; Currently, we check that after ECX = movl 3, we do not have subb CH, 16 ; whereas CH could have been redefine in between and that would have been 17 ; totally fine. 18 ; <rdar://problem/16582185> 19 target datalayout = "e-m:o-p:32:32-f64:32:64-f80:128-n8:16:32-S128" 20 target triple = "i386-apple-macosx10.9" 21 22 %struct.A = type { %struct.B, %struct.C, %struct.D*, [1 x i8*] } 23 %struct.B = type { i32, [4 x i8] } 24 %struct.C = type { i128 } 25 %struct.D = type { {}*, [0 x i32] } 26 %union.E = type { i32 } 27 28 ; CHECK-LABEL: __XXX1: 29 ; CHECK: movl $3, %ecx 30 ; CHECK-NOT: subb %{{[a-z]+}}, %ch 31 ; Function Attrs: nounwind optsize ssp 32 define fastcc void @__XXX1(%struct.A* %ht) #0 { 33 entry: 34 %const72 = bitcast i128 72 to i128 35 %const3 = bitcast i128 3 to i128 36 switch i32 undef, label %if.end196 [ 37 i32 1, label %sw.bb.i 38 i32 3, label %sw.bb2.i 39 ] 40 41 sw.bb.i: ; preds = %entry 42 %call.i.i.i = tail call i32 undef(%struct.A* %ht, i8 zeroext 22, i32 undef, i32 0, %struct.D* undef) 43 %bf.load.i.i = load i128, i128* undef, align 4 44 %bf.lshr.i.i = lshr i128 %bf.load.i.i, %const72 45 %shl1.i.i = shl nuw nsw i128 %bf.lshr.i.i, 8 46 %shl.i.i = trunc i128 %shl1.i.i to i32 47 br i1 undef, label %cond.false10.i.i, label %__XXX2.exit.i.i 48 49 __XXX2.exit.i.i: ; preds = %sw.bb.i 50 %extract11.i.i.i = lshr i128 %bf.load.i.i, %const3 51 %extract.t12.i.i.i = trunc i128 %extract11.i.i.i to i32 52 %bf.cast7.i.i.i = and i32 %extract.t12.i.i.i, 3 53 %arrayidx.i.i.i = getelementptr inbounds %struct.A, %struct.A* %ht, i32 0, i32 3, i32 %bf.cast7.i.i.i 54 br label %cond.end12.i.i 55 56 cond.false10.i.i: ; preds = %sw.bb.i 57 %arrayidx.i6.i.i = getelementptr inbounds %struct.A, %struct.A* %ht, i32 0, i32 3, i32 0 58 br label %cond.end12.i.i 59 60 cond.end12.i.i: ; preds = %cond.false10.i.i, %__XXX2.exit.i.i 61 %.sink.in.i.i = phi i8** [ %arrayidx.i.i.i, %__XXX2.exit.i.i ], [ %arrayidx.i6.i.i, %cond.false10.i.i ] 62 %.sink.i.i = load i8*, i8** %.sink.in.i.i, align 4 63 %tmp = bitcast i8* %.sink.i.i to %union.E* 64 br i1 undef, label %for.body.i.i, label %if.end196 65 66 for.body.i.i: ; preds = %for.body.i.i, %cond.end12.i.i 67 %weak.i.i = getelementptr inbounds %union.E, %union.E* %tmp, i32 undef, i32 0 68 %tmp1 = load i32, i32* %weak.i.i, align 4 69 %cmp36.i.i = icmp ne i32 %tmp1, %shl.i.i 70 %or.cond = and i1 %cmp36.i.i, false 71 br i1 %or.cond, label %for.body.i.i, label %if.end196 72 73 sw.bb2.i: ; preds = %entry 74 %bf.lshr.i85.i = lshr i128 undef, %const72 75 br i1 undef, label %if.end196, label %__XXX2.exit.i95.i 76 77 __XXX2.exit.i95.i: ; preds = %sw.bb2.i 78 %extract11.i.i91.i = lshr i128 undef, %const3 79 br label %if.end196 80 81 if.end196: ; preds = %__XXX2.exit.i95.i, %sw.bb2.i, %for.body.i.i, %cond.end12.i.i, %entry 82 ret void 83 } 84 85 attributes #0 = { nounwind optsize ssp "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" } 86
