[SCEV] Revert bailout added in r75511.

Summary:
With the introduction of MarkPendingLoopPredicates in r157092, I don't
think the bailout is needed anymore.

Reviewers: atrick, nicholas

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8624

llvm-svn: 233296

1 files changed, 45 insertions, 0 deletions

diff --git a/llvm/test/Analysis/ScalarEvolution/ext-antecedent.ll b/llvm/test/Analysis/ScalarEvolution/ext-antecedent.ll
new file mode 100644
index 00000000000..e8d38133ad3
--- /dev/null
+++ b/llvm/test/Analysis/ScalarEvolution/ext-antecedent.ll
@@ -0,0 +1,45 @@
+; RUN: opt -S -indvars < %s | FileCheck %s
+
+declare void @use(i1)
+
+define void @sext_condition(i8 %t) {
+; CHECK-LABEL: sext_condition
+ entry:
+  %st = sext i8 %t to i16
+  %ecmp = icmp slt i16 %st, 42
+  br i1 %ecmp, label %loop, label %exit
+
+ loop:
+; CHECK-LABEL: loop
+  %idx = phi i8 [ %t, %entry ], [ %idx.inc, %loop ]
+  %idx.inc = add i8 %idx, 1
+  %c = icmp slt i8 %idx, 42
+; CHECK: call void @use(i1 true)
+  call void @use(i1 %c)
+  %be = icmp slt i8 %idx.inc, 42
+  br i1 %be, label %loop, label %exit
+
+ exit:
+  ret void
+}
+
+define void @zext_condition(i8 %t) {
+; CHECK-LABEL: zext_condition
+ entry:
+  %st = zext i8 %t to i16
+  %ecmp = icmp ult i16 %st, 42
+  br i1 %ecmp, label %loop, label %exit
+
+ loop:
+; CHECK-LABEL: loop
+  %idx = phi i8 [ %t, %entry ], [ %idx.inc, %loop ]
+  %idx.inc = add i8 %idx, 1
+  %c = icmp ult i8 %idx, 42
+; CHECK: call void @use(i1 true)
+  call void @use(i1 %c)
+  %be = icmp ult i8 %idx.inc, 42
+  br i1 %be, label %loop, label %exit
+
+ exit:
+  ret void
+}