LSR shouldn't ever try to hack on integer IV's larger than 64-bits. Right now

it is not APInt clean, but even when it is it needs to be evaluated carefully
to determine whether it is actually profitable.

This fixes a crash on PR3806


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67134 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 98 insertions, 0 deletions

diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index 7951298..6401a4c 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -592,6 +592,12 @@ bool LoopStrengthReduce::AddUsersIfInteresting(Instruction *I, Loop *L,
                                       SmallPtrSet<Instruction*,16> &Processed) {
   if (!I->getType()->isInteger() && !isa<PointerType>(I->getType()))
     return false;   // Void and FP expressions cannot be reduced.
+
+  // LSR is not APInt clean, do not touch integers bigger than 64-bits.
+  if (I->getType()->isInteger() && 
+      I->getType()->getPrimitiveSizeInBits() > 64)
+    return false;
+  
   if (!Processed.insert(I))
     return true;    // Instruction already handled.
   
diff --git a/test/CodeGen/Generic/2009-03-17-LSR-APInt.ll b/test/CodeGen/Generic/2009-03-17-LSR-APInt.ll
new file mode 100644
index 0000000..c584402
--- /dev/null
+++ b/test/CodeGen/Generic/2009-03-17-LSR-APInt.ll
@@ -0,0 +1,92 @@
+; RUN: llvm-as < %s | llc
+; PR3806
+
+	%struct..0__pthread_mutex_s = type { i32, i32, i32, i32, i32, i32, %struct.__pthread_list_t }
+	%struct.Alignment = type { i32 }
+	%struct.QDesignerFormWindowInterface = type { %struct.QWidget }
+	%struct.QFont = type { %struct.QFontPrivate*, i32 }
+	%struct.QFontPrivate = type opaque
+	%"struct.QHash<QString,QList<QAbstractExtensionFactory*> >" = type { %"struct.QHash<QString,QList<QAbstractExtensionFactory*> >::._120" }
+	%"struct.QHash<QString,QList<QAbstractExtensionFactory*> >::._120" = type { %struct.QHashData* }
+	%struct.QHashData = type { %"struct.QHashData::Node"*, %"struct.QHashData::Node"**, %struct.Alignment, i32, i32, i16, i16, i32, i8 }
+	%"struct.QHashData::Node" = type { %"struct.QHashData::Node"*, i32 }
+	%"struct.QList<QAbstractExtensionFactory*>" = type { %"struct.QList<QAbstractExtensionFactory*>::._101" }
+	%"struct.QList<QAbstractExtensionFactory*>::._101" = type { %struct.QListData }
+	%struct.QListData = type { %"struct.QListData::Data"* }
+	%"struct.QListData::Data" = type { %struct.Alignment, i32, i32, i32, i8, [1 x i8*] }
+	%struct.QObject = type { i32 (...)**, %struct.QObjectData* }
+	%struct.QObjectData = type { i32 (...)**, %struct.QObject*, %struct.QObject*, %"struct.QList<QAbstractExtensionFactory*>", i32, i32 }
+	%struct.QPaintDevice.base = type { i32 (...)**, i16 }
+	%"struct.QPair<int,int>" = type { i32, i32 }
+	%struct.QPalette = type { %struct.QPalettePrivate*, i32 }
+	%struct.QPalettePrivate = type opaque
+	%struct.QRect = type { i32, i32, i32, i32 }
+	%struct.QWidget = type { %struct.QObject, %struct.QPaintDevice.base, %struct.QWidgetData* }
+	%struct.QWidgetData = type { i64, i32, %struct.Alignment, i8, i8, i16, %struct.QRect, %struct.QPalette, %struct.QFont, %struct.QRect }
+	%struct.__pthread_list_t = type { %struct.__pthread_list_t*, %struct.__pthread_list_t* }
+	%struct.pthread_attr_t = type { i64, [48 x i8] }
+	%struct.pthread_mutex_t = type { %struct..0__pthread_mutex_s }
+	%"struct.qdesigner_internal::Grid" = type { i32, i32, %struct.QWidget**, i8*, i8* }
+	%"struct.qdesigner_internal::GridLayout" = type { %"struct.qdesigner_internal::Layout", %"struct.QPair<int,int>", %"struct.qdesigner_internal::Grid"* }
+	%"struct.qdesigner_internal::Layout" = type { %struct.QObject, %"struct.QList<QAbstractExtensionFactory*>", %struct.QWidget*, %"struct.QHash<QString,QList<QAbstractExtensionFactory*> >", %struct.QWidget*, %struct.QDesignerFormWindowInterface*, i8, %"struct.QPair<int,int>", %struct.QRect, i8 }
+
+@_ZL20__gthrw_pthread_oncePiPFvvE = alias weak i32 (i32*, void ()*)* @pthread_once		; <i32 (i32*, void ()*)*> [#uses=0]
+@_ZL27__gthrw_pthread_getspecificj = alias weak i8* (i32)* @pthread_getspecific		; <i8* (i32)*> [#uses=0]
+@_ZL27__gthrw_pthread_setspecificjPKv = alias weak i32 (i32, i8*)* @pthread_setspecific		; <i32 (i32, i8*)*> [#uses=0]
+@_ZL22__gthrw_pthread_createPmPK14pthread_attr_tPFPvS3_ES3_ = alias weak i32 (i64*, %struct.pthread_attr_t*, i8* (i8*)*, i8*)* @pthread_create		; <i32 (i64*, %struct.pthread_attr_t*, i8* (i8*)*, i8*)*> [#uses=0]
+@_ZL22__gthrw_pthread_cancelm = alias weak i32 (i64)* @pthread_cancel		; <i32 (i64)*> [#uses=0]
+@_ZL26__gthrw_pthread_mutex_lockP15pthread_mutex_t = alias weak i32 (%struct.pthread_mutex_t*)* @pthread_mutex_lock		; <i32 (%struct.pthread_mutex_t*)*> [#uses=0]
+@_ZL29__gthrw_pthread_mutex_trylockP15pthread_mutex_t = alias weak i32 (%struct.pthread_mutex_t*)* @pthread_mutex_trylock		; <i32 (%struct.pthread_mutex_t*)*> [#uses=0]
+@_ZL28__gthrw_pthread_mutex_unlockP15pthread_mutex_t = alias weak i32 (%struct.pthread_mutex_t*)* @pthread_mutex_unlock		; <i32 (%struct.pthread_mutex_t*)*> [#uses=0]
+@_ZL26__gthrw_pthread_mutex_initP15pthread_mutex_tPK19pthread_mutexattr_t = alias weak i32 (%struct.pthread_mutex_t*, %struct.Alignment*)* @pthread_mutex_init		; <i32 (%struct.pthread_mutex_t*, %struct.Alignment*)*> [#uses=0]
+@_ZL26__gthrw_pthread_key_createPjPFvPvE = alias weak i32 (i32*, void (i8*)*)* @pthread_key_create		; <i32 (i32*, void (i8*)*)*> [#uses=0]
+@_ZL26__gthrw_pthread_key_deletej = alias weak i32 (i32)* @pthread_key_delete		; <i32 (i32)*> [#uses=0]
+@_ZL30__gthrw_pthread_mutexattr_initP19pthread_mutexattr_t = alias weak i32 (%struct.Alignment*)* @pthread_mutexattr_init		; <i32 (%struct.Alignment*)*> [#uses=0]
+@_ZL33__gthrw_pthread_mutexattr_settypeP19pthread_mutexattr_ti = alias weak i32 (%struct.Alignment*, i32)* @pthread_mutexattr_settype		; <i32 (%struct.Alignment*, i32)*> [#uses=0]
+@_ZL33__gthrw_pthread_mutexattr_destroyP19pthread_mutexattr_t = alias weak i32 (%struct.Alignment*)* @pthread_mutexattr_destroy		; <i32 (%struct.Alignment*)*> [#uses=0]
+
+define void @_ZN18qdesigner_internal10GridLayout9buildGridEv(%"struct.qdesigner_internal::GridLayout"* %this) nounwind {
+entry:
+	br label %bb44
+
+bb44:		; preds = %bb47, %entry
+	%indvar = phi i128 [ %indvar.next144, %bb47 ], [ 0, %entry ]		; <i128> [#uses=2]
+	br i1 false, label %bb46, label %bb47
+
+bb46:		; preds = %bb44
+	%tmp = shl i128 %indvar, 64		; <i128> [#uses=1]
+	%tmp96 = and i128 %tmp, 79228162495817593519834398720		; <i128> [#uses=0]
+	br label %bb47
+
+bb47:		; preds = %bb46, %bb44
+	%indvar.next144 = add i128 %indvar, 1		; <i128> [#uses=1]
+	br label %bb44
+}
+
+declare i32 @pthread_once(i32*, void ()*)
+
+declare i8* @pthread_getspecific(i32)
+
+declare i32 @pthread_setspecific(i32, i8*)
+
+declare i32 @pthread_create(i64*, %struct.pthread_attr_t*, i8* (i8*)*, i8*)
+
+declare i32 @pthread_cancel(i64)
+
+declare i32 @pthread_mutex_lock(%struct.pthread_mutex_t*)
+
+declare i32 @pthread_mutex_trylock(%struct.pthread_mutex_t*)
+
+declare i32 @pthread_mutex_unlock(%struct.pthread_mutex_t*)
+
+declare i32 @pthread_mutex_init(%struct.pthread_mutex_t*, %struct.Alignment*)
+
+declare i32 @pthread_key_create(i32*, void (i8*)*)
+
+declare i32 @pthread_key_delete(i32)
+
+declare i32 @pthread_mutexattr_init(%struct.Alignment*)
+
+declare i32 @pthread_mutexattr_settype(%struct.Alignment*, i32)
+
+declare i32 @pthread_mutexattr_destroy(%struct.Alignment*)