Imported Upstream version 5.18.0.205

Former-commit-id: 7f59f7e792705db773f1caecdaa823092f4e2927

external/llvm/test/Analysis/ScalarEvolution/2007-07-15-NegativeStride.ll

@@ -0,0 +1,22 @@
+; RUN: opt < %s -analyze -scalar-evolution -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR1533
+
+@array = weak global [101 x i32] zeroinitializer, align 32		; <[100 x i32]*> [#uses=1]
+
+; CHECK: Loop %bb: backedge-taken count is 100
+
+define void @loop(i32 %x) {
+entry:
+	br label %bb
+
+bb:		; preds = %bb, %entry
+	%i.01.0 = phi i32 [ 100, %entry ], [ %tmp4, %bb ]		; <i32> [#uses=2]
+	%tmp1 = getelementptr [101 x i32], [101 x i32]* @array, i32 0, i32 %i.01.0		; <i32*> [#uses=1]
+	store i32 %x, i32* %tmp1
+	%tmp4 = add i32 %i.01.0, -1		; <i32> [#uses=2]
+	%tmp7 = icmp sgt i32 %tmp4, -1		; <i1> [#uses=1]
+	br i1 %tmp7, label %bb, label %return
+
+return:		; preds = %bb
+	ret void
+}

external/llvm/test/Analysis/ScalarEvolution/2007-08-06-MisinterpretBranch.ll

@@ -0,0 +1,20 @@
+; RUN: opt < %s -indvars -adce -simplifycfg -S | FileCheck %s
+; PR1598
+
+; CHECK: icmp s
+
+define i32 @f(i32 %a, i32 %b, i32 %x, i32 %y) {
+entry:
+	%tmp3 = icmp eq i32 %a, %b		; <i1> [#uses=1]
+	br i1 %tmp3, label %return, label %bb
+
+bb:		; preds = %bb, %entry
+	%x_addr.0 = phi i32 [ %tmp6, %bb ], [ %x, %entry ]		; <i32> [#uses=1]
+	%tmp6 = add i32 %x_addr.0, 1		; <i32> [#uses=3]
+	%tmp9 = icmp slt i32 %tmp6, %y		; <i1> [#uses=1]
+	br i1 %tmp9, label %bb, label %return
+
+return:		; preds = %bb, %entry
+	%x_addr.1 = phi i32 [ %x, %entry ], [ %tmp6, %bb ]		; <i32> [#uses=1]
+	ret i32 %x_addr.1
+}

external/llvm/test/Analysis/ScalarEvolution/2007-08-06-Unsigned.ll

@@ -0,0 +1,32 @@
+; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s
+; PR1597
+
+; CHECK: Loop %bb: backedge-taken count is (-1 + (-1 * %x) + %y)
+
+define i32 @f(i32 %x, i32 %y) {
+entry:
+        %tmp63 = icmp ult i32 %x, %y            ; <i1> [#uses=1]
+        br i1 %tmp63, label %bb.preheader, label %bb8
+
+bb.preheader:           ; preds = %entry
+        br label %bb
+
+bb:             ; preds = %bb3, %bb.preheader
+        %x_addr.0 = phi i32 [ %tmp2, %bb3 ], [ %x, %bb.preheader ]              ; <i32> [#uses=1]
+        %tmp2 = add i32 %x_addr.0, 1            ; <i32> [#uses=3]
+        br label %bb3
+
+bb3:            ; preds = %bb
+        %tmp6 = icmp ult i32 %tmp2, %y          ; <i1> [#uses=1]
+        br i1 %tmp6, label %bb, label %bb8.loopexit
+
+bb8.loopexit:           ; preds = %bb3
+        br label %bb8
+
+bb8:            ; preds = %bb8.loopexit, %entry
+        %x_addr.1 = phi i32 [ %x, %entry ], [ %tmp2, %bb8.loopexit ]            ; <i32> [#uses=1]
+        br label %return
+
+return:         ; preds = %bb8
+        ret i32 %x_addr.1
+}

external/llvm/test/Analysis/ScalarEvolution/2007-09-27-LargeStepping.ll

@@ -0,0 +1,23 @@
+; RUN: opt < %s -analyze -scalar-evolution -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR1706
+
+; CHECK: backedge-taken count is 13
+
+define i32 @f() {
+entry:
+	br label %bb5
+
+bb:		; preds = %bb5
+	%tmp2 = shl i32 %j.0, 1		; <i32> [#uses=1]
+	%tmp4 = add i32 %i.0, 268435456		; <i32> [#uses=1]
+	br label %bb5
+
+bb5:		; preds = %bb, %entry
+	%j.0 = phi i32 [ 1, %entry ], [ %tmp2, %bb ]		; <i32> [#uses=2]
+	%i.0 = phi i32 [ -1879048192, %entry ], [ %tmp4, %bb ]		; <i32> [#uses=2]
+	%tmp7 = icmp slt i32 %i.0, 1610612736		; <i1> [#uses=1]
+	br i1 %tmp7, label %bb, label %return
+
+return:		; preds = %bb5
+	ret i32 %j.0
+}

external/llvm/test/Analysis/ScalarEvolution/2007-11-14-SignedAddRec.ll

@@ -0,0 +1,26 @@
+; RUN: opt < %s -indvars -S | FileCheck %s
+; PR1798
+
+; CHECK: printd(i32 1206807378)
+
+declare void @printd(i32)
+
+define i32 @test() {
+entry:
+	br label %bb6
+
+bb:		; preds = %bb6
+	%tmp3 = add i32 %x.0, %i.0		; <i32> [#uses=1]
+	%tmp5 = add i32 %i.0, 1		; <i32> [#uses=1]
+	br label %bb6
+
+bb6:		; preds = %bb, %entry
+	%i.0 = phi i32 [ 0, %entry ], [ %tmp5, %bb ]		; <i32> [#uses=3]
+	%x.0 = phi i32 [ 0, %entry ], [ %tmp3, %bb ]		; <i32> [#uses=3]
+	%tmp8 = icmp slt i32 %i.0, 123456789		; <i1> [#uses=1]
+	br i1 %tmp8, label %bb, label %bb10
+
+bb10:		; preds = %bb6
+	call void @printd(i32 %x.0)
+	ret i32 0
+}

external/llvm/test/Analysis/ScalarEvolution/2007-11-18-OrInstruction.ll

@@ -0,0 +1,21 @@
+; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
+; PR1810
+
+define void @fun() {
+entry:
+        br label %header
+header:
+        %i = phi i32 [ 1, %entry ], [ %i.next, %body ]
+        %cond = icmp eq i32 %i, 10
+        br i1 %cond, label %exit, label %body
+body:
+        %a = mul i32 %i, 5
+        %b = or i32 %a, 1
+        %i.next = add i32 %i, 1
+        br label %header
+exit:        
+        ret void
+}
+
+; CHECK: -->  %b
+

external/llvm/test/Analysis/ScalarEvolution/2008-02-11-ReversedCondition.ll

@@ -0,0 +1,17 @@
+; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s
+
+; CHECK: Loop %header: backedge-taken count is (0 smax %n)
+
+define void @foo(i32 %n) {
+entry:
+	br label %header
+header:
+	%i = phi i32 [ 0, %entry ], [ %i.inc, %next ]
+	%cond = icmp sgt i32 %n, %i
+	br i1 %cond, label %next, label %return
+next:
+        %i.inc = add i32 %i, 1
+	br label %header
+return:
+	ret void
+}

external/llvm/test/Analysis/ScalarEvolution/2008-02-12-SMAXTripCount.ll

@@ -0,0 +1,17 @@
+; RUN: opt < %s -scalar-evolution -analyze | FileCheck %s
+; PR2002
+
+; CHECK: Loop %loop: backedge-taken count is (100 + (-100 smax %n))
+define void @foo(i8 %n) {
+entry:
+	br label %loop
+loop:
+	%i = phi i8 [ -100, %entry ], [ %i.inc, %next ]
+	%cond = icmp slt i8 %i, %n
+	br i1 %cond, label %next, label %return
+next:
+        %i.inc = add i8 %i, 1
+	br label %loop
+return:
+	ret void
+}

external/llvm/test/Analysis/ScalarEvolution/2008-02-15-UMax.ll

@@ -0,0 +1,19 @@
+; RUN: opt < %s -analyze -scalar-evolution | FileCheck %s
+; PR2003
+
+; CHECK: umax
+
+define i32 @foo(i32 %n) {
+entry:
+        br label %header
+header:
+        %i = phi i32 [ 100, %entry ], [ %i.inc, %next ]
+        %cond = icmp ult i32 %i, %n
+        br i1 %cond, label %next, label %return
+next:
+        %i.inc = add i32 %i, 1
+        br label %header
+return:
+        ret i32 %i
+}
+

external/llvm/test/Analysis/ScalarEvolution/2008-05-25-NegativeStepToZero.ll

@@ -0,0 +1,23 @@
+; RUN: opt < %s -analyze -scalar-evolution -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR2364
+
+; CHECK: backedge-taken count is 61
+
+define i32 @func_6() nounwind  {
+entry:
+	br label %bb5
+
+bb:		; preds = %bb5
+	%tmp2 = add i32 %i.0, 1		; <i32> [#uses=1]
+	%tmp4 = add i8 %x.0, -4		; <i8> [#uses=1]
+	br label %bb5
+
+bb5:		; preds = %bb, %entry
+	%x.0 = phi i8 [ 0, %entry ], [ %tmp4, %bb ]		; <i8> [#uses=2]
+	%i.0 = phi i32 [ 0, %entry ], [ %tmp2, %bb ]		; <i32> [#uses=2]
+	%tmp7 = icmp eq i8 %x.0, 12		; <i1> [#uses=1]
+	br i1 %tmp7, label %return, label %bb
+
+return:		; preds = %bb5
+	ret i32 %i.0
+}

external/llvm/test/Analysis/ScalarEvolution/2008-06-12-BinomialInt64.ll

@@ -0,0 +1,43 @@
+; RUN: opt < %s -analyze -scalar-evolution 2>/dev/null
+; PR2433
+
+define i32 @main1(i32 %argc, i8** %argv) nounwind  {
+entry:
+	br i1 false, label %bb10, label %bb23
+
+bb10:		; preds = %bb10, %entry
+	%accum.03 = phi i64 [ %tmp14, %bb10 ], [ 0, %entry ]		; <i64> [#uses=1]
+	%i.02 = phi i32 [ %tmp16, %bb10 ], [ 0, %entry ]		; <i32> [#uses=1]
+	%d.1.01 = phi i64 [ %tmp5.i, %bb10 ], [ 0, %entry ]		; <i64> [#uses=1]
+	%tmp5.i = add i64 %d.1.01, 1		; <i64> [#uses=2]
+	%tmp14 = add i64 %accum.03, %tmp5.i		; <i64> [#uses=2]
+	%tmp16 = add i32 %i.02, 1		; <i32> [#uses=2]
+	%tmp20 = icmp slt i32 %tmp16, 0		; <i1> [#uses=1]
+	br i1 %tmp20, label %bb10, label %bb23
+
+bb23:		; preds = %bb10, %entry
+	%accum.0.lcssa = phi i64 [ 0, %entry ], [ %tmp14, %bb10 ]		; <i64> [#uses=0]
+	ret i32 0
+}
+
+define i32 @main2(i32 %argc, i8** %argv) {
+entry:
+	%tmp8 = tail call i32 @atoi( i8* null ) nounwind readonly 		; <i32> [#uses=1]
+	br i1 false, label %bb9, label %bb21
+
+bb9:		; preds = %bb9, %entry
+	%accum.03 = phi i64 [ %tmp12, %bb9 ], [ 0, %entry ]		; <i64> [#uses=1]
+	%i.02 = phi i32 [ %tmp14, %bb9 ], [ 0, %entry ]		; <i32> [#uses=1]
+	%d.1.01 = phi i64 [ %tmp4.i, %bb9 ], [ 0, %entry ]		; <i64> [#uses=1]
+	%tmp4.i = add i64 %d.1.01, 1		; <i64> [#uses=2]
+	%tmp12 = add i64 %accum.03, %tmp4.i		; <i64> [#uses=2]
+	%tmp14 = add i32 %i.02, 1		; <i32> [#uses=2]
+	%tmp18 = icmp slt i32 %tmp14, %tmp8		; <i1> [#uses=1]
+	br i1 %tmp18, label %bb9, label %bb21
+
+bb21:		; preds = %bb9, %entry
+	%accum.0.lcssa = phi i64 [ 0, %entry ], [ %tmp12, %bb9 ]		; <i64> [#uses=0]
+	ret i32 0
+}
+
+declare i32 @atoi(i8*) nounwind readonly 

external/llvm/test/Analysis/ScalarEvolution/2008-07-12-UnneededSelect1.ll

@@ -0,0 +1,39 @@
+; RUN: opt < %s -analyze -scalar-evolution 2>&1 | FileCheck %s
+; PR2261
+
+; CHECK: Printing analysis 'Scalar Evolution Analysis' for function 'foo'
+; CHECK-NOT: smax
+
+@lut = common global [256 x i8] zeroinitializer, align 32		; <[256 x i8]*> [#uses=1]
+
+define void @foo(i32 %count, i32* %srcptr, i32* %dstptr) nounwind  {
+entry:
+	icmp sgt i32 %count, 0		; <i1>:0 [#uses=1]
+	br i1 %0, label %bb.nph, label %return
+
+bb.nph:		; preds = %entry
+	br label %bb
+
+bb:		; preds = %bb1, %bb.nph
+	%j.01 = phi i32 [ %8, %bb1 ], [ 0, %bb.nph ]		; <i32> [#uses=1]
+	load i32, i32* %srcptr, align 4		; <i32>:1 [#uses=2]
+	and i32 %1, 255		; <i32>:2 [#uses=1]
+	and i32 %1, -256		; <i32>:3 [#uses=1]
+	getelementptr [256 x i8], [256 x i8]* @lut, i32 0, i32 %2		; <i8*>:4 [#uses=1]
+	load i8, i8* %4, align 1		; <i8>:5 [#uses=1]
+	zext i8 %5 to i32		; <i32>:6 [#uses=1]
+	or i32 %6, %3		; <i32>:7 [#uses=1]
+	store i32 %7, i32* %dstptr, align 4
+	add i32 %j.01, 1		; <i32>:8 [#uses=2]
+	br label %bb1
+
+bb1:		; preds = %bb
+	icmp slt i32 %8, %count		; <i1>:9 [#uses=1]
+	br i1 %9, label %bb, label %bb1.return_crit_edge
+
+bb1.return_crit_edge:		; preds = %bb1
+	br label %return
+
+return:		; preds = %bb1.return_crit_edge, %entry
+	ret void
+}

external/llvm/test/Analysis/ScalarEvolution/2008-07-12-UnneededSelect2.ll

@@ -0,0 +1,33 @@
+; RUN: opt < %s -analyze -scalar-evolution 2>&1 | FileCheck %s
+; PR2070
+
+; CHECK: Printing analysis 'Scalar Evolution Analysis' for function 'a'
+; CHECK-NOT: smax
+
+define i32 @a(i32 %x) nounwind  {
+entry:
+	icmp sgt i32 %x, 1		; <i1>:0 [#uses=1]
+	br i1 %0, label %bb.nph, label %bb2
+
+bb.nph:		; preds = %entry
+	br label %bb
+
+bb:		; preds = %bb1, %bb.nph
+	%z.02 = phi i32 [ %1, %bb1 ], [ 1, %bb.nph ]		; <i32> [#uses=1]
+	%i.01 = phi i32 [ %2, %bb1 ], [ 1, %bb.nph ]		; <i32> [#uses=2]
+	mul i32 %z.02, %i.01		; <i32>:1 [#uses=2]
+	add i32 %i.01, 1		; <i32>:2 [#uses=2]
+	br label %bb1
+
+bb1:		; preds = %bb
+	icmp slt i32 %2, %x		; <i1>:3 [#uses=1]
+	br i1 %3, label %bb, label %bb1.bb2_crit_edge
+
+bb1.bb2_crit_edge:		; preds = %bb1
+	%.lcssa = phi i32 [ %1, %bb1 ]		; <i32> [#uses=1]
+	br label %bb2
+
+bb2:		; preds = %bb1.bb2_crit_edge, %entry
+	%z.0.lcssa = phi i32 [ %.lcssa, %bb1.bb2_crit_edge ], [ 1, %entry ]		; <i32> [#uses=1]
+	ret i32 %z.0.lcssa
+}

external/llvm/test/Analysis/ScalarEvolution/2008-07-19-InfiniteLoop.ll

@@ -0,0 +1,16 @@
+; RUN: opt < %s -analyze -scalar-evolution -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR2088
+
+; CHECK: Unpredictable
+
+define void @fun() {
+entry:
+        br label %loop
+loop:
+        %i = phi i8 [ 0, %entry ], [ %i.next, %loop ]
+        %i.next = add i8 %i, 4
+        %cond = icmp ne i8 %i.next, 6
+        br i1 %cond, label %loop, label %exit
+exit:
+        ret void
+}

external/llvm/test/Analysis/ScalarEvolution/2008-07-19-WrappingIV.ll

@@ -0,0 +1,16 @@
+; RUN: opt < %s -analyze -scalar-evolution -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR2088
+
+; CHECK: backedge-taken count is 113
+
+define void @fun() {
+entry:
+        br label %loop
+loop:
+        %i = phi i8 [ 0, %entry ], [ %i.next, %loop ]
+        %i.next = add i8 %i, 18
+        %cond = icmp ne i8 %i.next, 4
+        br i1 %cond, label %loop, label %exit
+exit:
+        ret void
+}

external/llvm/test/Analysis/ScalarEvolution/2008-07-29-SGTTripCount.ll

@@ -0,0 +1,28 @@
+; RUN: opt < %s -analyze -scalar-evolution \
+; RUN:   -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR2607
+
+define i32 @_Z1aj(i32 %j) nounwind  {
+entry:
+	icmp sgt i32 0, %j		; <i1>:0 [#uses=1]
+	br i1 %0, label %bb.preheader, label %return
+
+bb.preheader:		; preds = %entry
+	br label %bb
+
+bb:		; preds = %bb, %bb.preheader
+	%i.01 = phi i32 [ %1, %bb ], [ 0, %bb.preheader ]		; <i32> [#uses=1]
+	add i32 %i.01, -1		; <i32>:1 [#uses=3]
+	icmp sgt i32 %1, %j		; <i1>:2 [#uses=1]
+	br i1 %2, label %bb, label %return.loopexit
+
+return.loopexit:		; preds = %bb
+	br label %return
+
+return:		; preds = %return.loopexit, %entry
+	%i.0.lcssa = phi i32 [ 0, %entry ], [ %1, %return.loopexit ]		; <i32> [#uses=1]
+	ret i32 %i.0.lcssa
+}
+
+; CHECK: backedge-taken count is (-1 + (-1 * %j))
+

external/llvm/test/Analysis/ScalarEvolution/2008-07-29-SMinExpr.ll

@@ -0,0 +1,26 @@
+; RUN: opt < %s -analyze -scalar-evolution \
+; RUN:   -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR2607
+
+define i32 @b(i32 %x, i32 %y) nounwind {
+entry:
+	%cmp2 = icmp slt i32 %y, %x
+	%cond3 = select i1 %cmp2, i32 %y, i32 %x
+	%cmp54 = icmp slt i32 %cond3, -2147483632
+	br i1 %cmp54, label %forinc, label %afterfor
+
+forinc:		; preds = %forinc, %entry
+	%j.01 = phi i32 [ %dec, %forinc ], [ -2147483632, %entry ]
+	%dec = add i32 %j.01, -1
+	%cmp = icmp slt i32 %y, %x
+	%cond = select i1 %cmp, i32 %y, i32 %x
+	%cmp5 = icmp sgt i32 %dec, %cond
+	br i1 %cmp5, label %forinc, label %afterfor
+
+afterfor:		; preds = %forinc, %entry
+	%j.0.lcssa = phi i32 [ -2147483632, %entry ], [ %dec, %forinc ]
+	ret i32 %j.0.lcssa
+}
+
+; CHECK: backedge-taken count is (-2147483632 + ((-1 + (-1 * %{{[xy]}})) smax (-1 + (-1 * %{{[xy]}}))))
+

external/llvm/test/Analysis/ScalarEvolution/2008-08-04-IVOverflow.ll

@@ -0,0 +1,27 @@
+; RUN: opt < %s -analyze -scalar-evolution \
+; RUN:   -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR2621
+
+define i32 @a() nounwind  {
+entry:
+	br label %bb1
+
+bb:
+	trunc i32 %i.0 to i16
+	add i16 %0, %x16.0
+	add i32 %i.0, 1
+	br label %bb1
+
+bb1:
+	%i.0 = phi i32 [ 0, %entry ], [ %2, %bb ]
+	%x16.0 = phi i16 [ 0, %entry ], [ %1, %bb ]
+	icmp ult i32 %i.0, 888888
+	br i1 %3, label %bb, label %bb2
+
+bb2:
+	zext i16 %x16.0 to i32
+	ret i32 %4
+}
+
+; CHECK: Exits: 20028
+

external/llvm/test/Analysis/ScalarEvolution/2008-08-04-LongAddRec.ll

@@ -0,0 +1,58 @@
+; RUN: opt < %s -analyze -scalar-evolution \
+; RUN:   -scalar-evolution-max-iterations=0 | FileCheck %s
+; PR2621
+
+define i32 @a() nounwind  {
+entry:
+	br label %bb1
+
+bb:		; preds = %bb1
+	add i16 %x17.0, 1		; <i16>:0 [#uses=2]
+	add i16 %0, %x16.0		; <i16>:1 [#uses=2]
+	add i16 %1, %x15.0		; <i16>:2 [#uses=2]
+	add i16 %2, %x14.0		; <i16>:3 [#uses=2]
+	add i16 %3, %x13.0		; <i16>:4 [#uses=2]
+	add i16 %4, %x12.0		; <i16>:5 [#uses=2]
+	add i16 %5, %x11.0		; <i16>:6 [#uses=2]
+	add i16 %6, %x10.0		; <i16>:7 [#uses=2]
+	add i16 %7, %x9.0		; <i16>:8 [#uses=2]
+	add i16 %8, %x8.0		; <i16>:9 [#uses=2]
+	add i16 %9, %x7.0		; <i16>:10 [#uses=2]
+	add i16 %10, %x6.0		; <i16>:11 [#uses=2]
+	add i16 %11, %x5.0		; <i16>:12 [#uses=2]
+	add i16 %12, %x4.0		; <i16>:13 [#uses=2]
+	add i16 %13, %x3.0		; <i16>:14 [#uses=2]
+	add i16 %14, %x2.0		; <i16>:15 [#uses=2]
+	add i16 %15, %x1.0		; <i16>:16 [#uses=1]
+	add i32 %i.0, 1		; <i32>:17 [#uses=1]
+	br label %bb1
+
+bb1:		; preds = %bb, %entry
+	%x2.0 = phi i16 [ 0, %entry ], [ %15, %bb ]		; <i16> [#uses=1]
+	%x3.0 = phi i16 [ 0, %entry ], [ %14, %bb ]		; <i16> [#uses=1]
+	%x4.0 = phi i16 [ 0, %entry ], [ %13, %bb ]		; <i16> [#uses=1]
+	%x5.0 = phi i16 [ 0, %entry ], [ %12, %bb ]		; <i16> [#uses=1]
+	%x6.0 = phi i16 [ 0, %entry ], [ %11, %bb ]		; <i16> [#uses=1]
+	%x7.0 = phi i16 [ 0, %entry ], [ %10, %bb ]		; <i16> [#uses=1]
+	%x8.0 = phi i16 [ 0, %entry ], [ %9, %bb ]		; <i16> [#uses=1]
+	%x9.0 = phi i16 [ 0, %entry ], [ %8, %bb ]		; <i16> [#uses=1]
+	%x10.0 = phi i16 [ 0, %entry ], [ %7, %bb ]		; <i16> [#uses=1]
+	%x11.0 = phi i16 [ 0, %entry ], [ %6, %bb ]		; <i16> [#uses=1]
+	%x12.0 = phi i16 [ 0, %entry ], [ %5, %bb ]		; <i16> [#uses=1]
+	%x13.0 = phi i16 [ 0, %entry ], [ %4, %bb ]		; <i16> [#uses=1]
+	%x14.0 = phi i16 [ 0, %entry ], [ %3, %bb ]		; <i16> [#uses=1]
+	%x15.0 = phi i16 [ 0, %entry ], [ %2, %bb ]		; <i16> [#uses=1]
+	%x16.0 = phi i16 [ 0, %entry ], [ %1, %bb ]		; <i16> [#uses=1]
+	%x17.0 = phi i16 [ 0, %entry ], [ %0, %bb ]		; <i16> [#uses=1]
+	%i.0 = phi i32 [ 0, %entry ], [ %17, %bb ]		; <i32> [#uses=2]
+	%x1.0 = phi i16 [ 0, %entry ], [ %16, %bb ]		; <i16> [#uses=2]
+	icmp ult i32 %i.0, 8888		; <i1>:18 [#uses=1]
+	br i1 %18, label %bb, label %bb2
+
+bb2:		; preds = %bb1
+	zext i16 %x1.0 to i32		; <i32>:19 [#uses=1]
+	ret i32 %19
+}
+
+; CHECK: Exits: -19168
+

external/llvm/test/Analysis/ScalarEvolution/2008-11-02-QuadraticCrash.ll

@@ -0,0 +1,21 @@
+; RUN: opt < %s -analyze -scalar-evolution
+; PR1827
+
+declare void @use(i32)
+
+define void @foo() {
+entry:
+	br label %loop_1
+
+loop_1:		; preds = %loop_1, %entry
+	%a = phi i32 [ 2, %entry ], [ %b, %loop_1 ]		; <i32> [#uses=2]
+	%c = phi i32 [ 5, %entry ], [ %d, %loop_1 ]		; <i32> [#uses=1]
+	%b = add i32 %a, 1		; <i32> [#uses=1]
+	%d = add i32 %c, %a		; <i32> [#uses=3]
+	%A = icmp ult i32 %d, 50		; <i1> [#uses=1]
+	br i1 %A, label %loop_1, label %endloop
+
+endloop:		; preds = %loop_1
+	call void @use(i32 %d)
+	ret void
+}