1. IMPLICIT_DEF can *re-define* any register.
2. Coalescer can now create an interesting situation where a register def can
reaches itself without being killed.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49246 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/ARM/2008-04-04-ScavengerAssert.ll b/test/CodeGen/ARM/2008-04-04-ScavengerAssert.ll
new file mode 100644
index 0000000..74717f8
--- /dev/null
+++ b/test/CodeGen/ARM/2008-04-04-ScavengerAssert.ll
@@ -0,0 +1,60 @@
+; RUN: llvm-as < %s | llc -march=arm
+
+@numBinsY = external global i32 ; <i32*> [#uses=1]
+
+declare double @pow(double, double)
+
+define void @main(i32 %argc, i8** %argv) noreturn nounwind {
+entry:
+ br i1 false, label %bb34.outer.i.i.i, label %cond_false674
+bb34.outer.i.i.i: ; preds = %entry
+ br i1 false, label %bb2.i.i.i, label %bb47.i.i.i
+bb2.i.i.i: ; preds = %bb34.outer.i.i.i
+ %tmp24.i.i.i = call double @pow( double 0.000000e+00, double 2.000000e+00 ) ; <double> [#uses=0]
+ ret void
+bb47.i.i.i: ; preds = %bb34.outer.i.i.i
+ br i1 false, label %bb220.i.i.i, label %bb62.preheader.i.i.i
+bb62.preheader.i.i.i: ; preds = %bb47.i.i.i
+ ret void
+bb220.i.i.i: ; preds = %bb47.i.i.i
+ br i1 false, label %bb248.i.i.i, label %cond_next232.i.i.i
+cond_next232.i.i.i: ; preds = %bb220.i.i.i
+ ret void
+bb248.i.i.i: ; preds = %bb220.i.i.i
+ br i1 false, label %bb300.i.i.i, label %cond_false256.i.i.i
+cond_false256.i.i.i: ; preds = %bb248.i.i.i
+ ret void
+bb300.i.i.i: ; preds = %bb248.i.i.i
+ store i32 undef, i32* @numBinsY, align 4
+ ret void
+cond_false674: ; preds = %entry
+ ret void
+}
+
+ %struct.anon = type { %struct.rnode*, %struct.rnode* }
+ %struct.ch_set = type { { i8, i8 }*, %struct.ch_set* }
+ %struct.pat_list = type { i32, %struct.pat_list* }
+ %struct.rnode = type { i16, { %struct.anon }, i16, %struct.pat_list*, %struct.pat_list* }
+
+define fastcc { i16, %struct.rnode* }* @get_token(i8** %s) nounwind {
+entry:
+ br i1 false, label %bb42, label %bb78
+bb42: ; preds = %entry
+ br label %cond_next119.i
+bb17.i: ; preds = %cond_next119.i
+ br i1 false, label %cond_true53.i, label %cond_false99.i
+cond_true53.i: ; preds = %bb17.i
+ ret { i16, %struct.rnode* }* null
+cond_false99.i: ; preds = %bb17.i
+ %tmp106.i = malloc %struct.ch_set ; <%struct.ch_set*> [#uses=1]
+ br i1 false, label %bb126.i, label %cond_next119.i
+cond_next119.i: ; preds = %cond_false99.i, %bb42
+ %curr_ptr.0.reg2mem.0.i = phi %struct.ch_set* [ %tmp106.i, %cond_false99.i ], [ null, %bb42 ] ; <%struct.ch_set*> [#uses=2]
+ %prev_ptr.0.reg2mem.0.i = phi %struct.ch_set* [ %curr_ptr.0.reg2mem.0.i, %cond_false99.i ], [ undef, %bb42 ] ; <%struct.ch_set*> [#uses=1]
+ br i1 false, label %bb126.i, label %bb17.i
+bb126.i: ; preds = %cond_next119.i, %cond_false99.i
+ %prev_ptr.0.reg2mem.1.i = phi %struct.ch_set* [ %prev_ptr.0.reg2mem.0.i, %cond_next119.i ], [ %curr_ptr.0.reg2mem.0.i, %cond_false99.i ] ; <%struct.ch_set*> [#uses=0]
+ ret { i16, %struct.rnode* }* null
+bb78: ; preds = %entry
+ ret { i16, %struct.rnode* }* null
+}