Rewrite code that propagate isDead information after a dead copy is coalesced. This remove some ugly spaghetti code and fixed a number of subtle bugs.
llvm-svn: 48490
diff --git a/llvm/test/CodeGen/PowerPC/2008-03-17-RegScavengerCrash.ll b/llvm/test/CodeGen/PowerPC/2008-03-17-RegScavengerCrash.ll
new file mode 100644
index 0000000..eaeccc5
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/2008-03-17-RegScavengerCrash.ll
@@ -0,0 +1,31 @@
+; RUN: llvm-as < %s | llc -march=ppc32 -enable-ppc32-regscavenger
+
+ %struct._cpp_strbuf = type { i8*, i32, i32 }
+ %struct.cpp_string = type { i32, i8* }
+
+declare fastcc void @emit_numeric_escape(i32, i32, %struct._cpp_strbuf*, i32) nounwind
+
+define i32 @cpp_interpret_string(i32 %pfile, %struct.cpp_string* %from, i32 %wide) nounwind {
+entry:
+ %tmp61 = load i32* null, align 4 ; <i32> [#uses=1]
+ %toBool = icmp eq i32 %wide, 0 ; <i1> [#uses=2]
+ %iftmp.87.0 = select i1 %toBool, i32 %tmp61, i32 0 ; <i32> [#uses=2]
+ %tmp69 = icmp ult i32 %iftmp.87.0, 33 ; <i1> [#uses=1]
+ %min = select i1 %tmp69, i32 %iftmp.87.0, i32 32 ; <i32> [#uses=1]
+ %tmp71 = icmp ugt i32 %min, 31 ; <i1> [#uses=1]
+ br i1 %tmp71, label %bb79, label %bb75
+bb75: ; preds = %entry
+ ret i32 0
+bb79: ; preds = %entry
+ br i1 %toBool, label %bb103, label %bb94
+bb94: ; preds = %bb79
+ br i1 false, label %bb729, label %bb130.preheader
+bb103: ; preds = %bb79
+ ret i32 0
+bb130.preheader: ; preds = %bb94
+ %tmp134 = getelementptr %struct.cpp_string* %from, i32 0, i32 1 ; <i8**> [#uses=0]
+ ret i32 0
+bb729: ; preds = %bb94
+ call fastcc void @emit_numeric_escape( i32 %pfile, i32 0, %struct._cpp_strbuf* null, i32 %wide ) nounwind
+ ret i32 1
+}