Fix a coaelescer bug. If a copy val# is extended to eliminate a non-trivially coalesced copy, and the copy kills its source register. Trim the source register's live range to the last use if possible. This fixes up kill marker to make the scavenger happy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77967 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 46 insertions, 0 deletions

diff --git a/test/CodeGen/Thumb2/2009-08-02-CoalescerBug.ll b/test/CodeGen/Thumb2/2009-08-02-CoalescerBug.ll
new file mode 100644
index 0000000..2f4683a
--- /dev/null
+++ b/test/CodeGen/Thumb2/2009-08-02-CoalescerBug.ll
@@ -0,0 +1,46 @@
+; RUN: llvm-as < %s | llc -mtriple=thumbv7-apple-darwin9 -mcpu=cortex-a8 -relocation-model=pic -disable-fp-elim
+
+	type { void (%"struct.xalanc_1_8::FormatterToXML"*, i16)*, i32 }		; type %0
+	type { void (%"struct.xalanc_1_8::FormatterToXML"*, i16*)*, i32 }		; type %1
+	type { void (%"struct.xalanc_1_8::FormatterToXML"*, %"struct.xalanc_1_8::XalanDOMString"*)*, i32 }		; type %2
+	type { void (%"struct.xalanc_1_8::FormatterToXML"*, i16*, i32, i32)*, i32 }		; type %3
+	type { void (%"struct.xalanc_1_8::FormatterToXML"*)*, i32 }		; type %4
+	%"struct.std::CharVectorType" = type { %"struct.std::_Vector_base<char,std::allocator<char> >" }
+	%"struct.std::_Bit_const_iterator" = type { %"struct.std::_Bit_iterator_base" }
+	%"struct.std::_Bit_iterator_base" = type { i32*, i32 }
+	%"struct.std::_Bvector_base<std::allocator<bool> >" = type { %"struct.std::_Bvector_base<std::allocator<bool> >::_Bvector_impl" }
+	%"struct.std::_Bvector_base<std::allocator<bool> >::_Bvector_impl" = type { %"struct.std::_Bit_const_iterator", %"struct.std::_Bit_const_iterator", i32* }
+	%"struct.std::_Vector_base<char,std::allocator<char> >" = type { %"struct.std::_Vector_base<char,std::allocator<char> >::_Vector_impl" }
+	%"struct.std::_Vector_base<char,std::allocator<char> >::_Vector_impl" = type { i8*, i8*, i8* }
+	%"struct.std::_Vector_base<short unsigned int,std::allocator<short unsigned int> >" = type { %"struct.std::_Vector_base<short unsigned int,std::allocator<short unsigned int> >::_Vector_impl" }
+	%"struct.std::_Vector_base<short unsigned int,std::allocator<short unsigned int> >::_Vector_impl" = type { i16*, i16*, i16* }
+	%"struct.std::basic_ostream<char,std::char_traits<char> >.base" = type { i32 (...)** }
+	%"struct.std::vector<bool,std::allocator<bool> >" = type { %"struct.std::_Bvector_base<std::allocator<bool> >" }
+	%"struct.std::vector<short unsigned int,std::allocator<short unsigned int> >" = type { %"struct.std::_Vector_base<short unsigned int,std::allocator<short unsigned int> >" }
+	%"struct.xalanc_1_8::FormatterListener" = type { %"struct.std::basic_ostream<char,std::char_traits<char> >.base", %"struct.std::basic_ostream<char,std::char_traits<char> >.base"*, i32 }
+	%"struct.xalanc_1_8::FormatterToXML" = type { %"struct.xalanc_1_8::FormatterListener", %"struct.std::basic_ostream<char,std::char_traits<char> >.base"*, %"struct.xalanc_1_8::XalanOutputStream"*, i16, [256 x i16], [256 x i16], i8, i8, i8, i8, i8, i8, i8, i8, i8, i8, %"struct.xalanc_1_8::XalanDOMString", %"struct.xalanc_1_8::XalanDOMString", %"struct.xalanc_1_8::XalanDOMString", i32, i32, %"struct.std::vector<bool,std::allocator<bool> >", %"struct.xalanc_1_8::XalanDOMString", i8, i8, i8, i8, i8, %"struct.xalanc_1_8::XalanDOMString", %"struct.xalanc_1_8::XalanDOMString", %"struct.xalanc_1_8::XalanDOMString", %"struct.xalanc_1_8::XalanDOMString", %"struct.std::vector<short unsigned int,std::allocator<short unsigned int> >", i32, %"struct.std::CharVectorType", %"struct.std::vector<bool,std::allocator<bool> >", %0, %1, %2, %3, %0, %1, %2, %3, %4, i16*, i32 }
+	%"struct.xalanc_1_8::XalanDOMString" = type { %"struct.std::vector<short unsigned int,std::allocator<short unsigned int> >", i32 }
+	%"struct.xalanc_1_8::XalanOutputStream" = type { i32 (...)**, i32, %"struct.std::basic_ostream<char,std::char_traits<char> >.base"*, i32, %"struct.std::vector<short unsigned int,std::allocator<short unsigned int> >", %"struct.xalanc_1_8::XalanDOMString", i8, i8, %"struct.std::CharVectorType" }
+
+declare arm_apcscc void @_ZN10xalanc_1_814FormatterToXML17writeParentTagEndEv(%"struct.xalanc_1_8::FormatterToXML"*)
+
+define arm_apcscc void @_ZN10xalanc_1_814FormatterToXML5cdataEPKtj(%"struct.xalanc_1_8::FormatterToXML"* %this, i16* %ch, i32 %length) {
+entry:
+	%0 = getelementptr %"struct.xalanc_1_8::FormatterToXML"* %this, i32 0, i32 13		; <i8*> [#uses=1]
+	br i1 undef, label %bb4, label %bb
+
+bb:		; preds = %entry
+	store i8 0, i8* %0, align 1
+	%1 = getelementptr %"struct.xalanc_1_8::FormatterToXML"* %this, i32 0, i32 0, i32 0, i32 0		; <i32 (...)***> [#uses=1]
+	%2 = load i32 (...)*** %1, align 4		; <i32 (...)**> [#uses=1]
+	%3 = getelementptr i32 (...)** %2, i32 11		; <i32 (...)**> [#uses=1]
+	%4 = load i32 (...)** %3, align 4		; <i32 (...)*> [#uses=1]
+	%5 = bitcast i32 (...)* %4 to void (%"struct.xalanc_1_8::FormatterToXML"*, i16*, i32)*		; <void (%"struct.xalanc_1_8::FormatterToXML"*, i16*, i32)*> [#uses=1]
+	tail call arm_apcscc  void %5(%"struct.xalanc_1_8::FormatterToXML"* %this, i16* %ch, i32 %length)
+	ret void
+
+bb4:		; preds = %entry
+	tail call arm_apcscc  void @_ZN10xalanc_1_814FormatterToXML17writeParentTagEndEv(%"struct.xalanc_1_8::FormatterToXML"* %this)
+	tail call arm_apcscc  void undef(%"struct.xalanc_1_8::FormatterToXML"* %this, i16* %ch, i32 0, i32 %length, i8 zeroext undef)
+	ret void
+}