1 files changed, 85 insertions, 0 deletions
diff --git a/test/CodeGen/X86/remat-invalid-liveness.ll b/test/CodeGen/X86/remat-invalid-liveness.ll
new file mode 100644
index 0000000..d285e83
--- /dev/null
+++ b/test/CodeGen/X86/remat-invalid-liveness.ll
@@ -0,0 +1,85 @@
+; 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" }