Merging r259702:

[oota-llvm.git] / test / Transforms / LoopStrengthReduce / quadradic-exit-value.ll

diff --git a/test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll b/test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll
index 8959c17740990d4c269b752f9d6eb8fd8b09295e..c6d6690e4302a0efe89170fad80941cc6dfbf931 100644 (file)
--- a/test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll
+++ b/test/Transforms/LoopStrengthReduce/quadradic-exit-value.ll
@@ -1,18 +1,53 @@
-; RUN: opt < %s -analyze -iv-users | grep {\{1,+,3,+,2\}<%loop> (post-inc)}
+; RUN: opt < %s -analyze -iv-users | FileCheck %s
 
-; The value of %r is dependent on a polynomial iteration expression.
+; Provide legal integer types.
+target datalayout = "n8:16:32:64"
 
+; The value of %r is dependent on a polynomial iteration expression.
+;
+; CHECK-LABEL: IV Users for loop %foo.loop
+; CHECK: {1,+,3,+,2}<%foo.loop>
 define i64 @foo(i64 %n) {
 entry:
-  br label %loop
+  br label %foo.loop
 
-loop:
-  %indvar = phi i64 [ 0, %entry ], [ %indvar.next, %loop ]
+foo.loop:
+  %indvar = phi i64 [ 0, %entry ], [ %indvar.next, %foo.loop ]
   %indvar.next = add i64 %indvar, 1
   %c = icmp eq i64 %indvar.next, %n
-  br i1 %c, label %exit, label %loop
+  br i1 %c, label %exit, label %foo.loop
 
 exit:
   %r = mul i64 %indvar.next, %indvar.next
   ret i64 %r
 }
+
+; PR15470: LSR miscompile. The test2 function should return '1'.
+;
+; SCEV does not know how to denormalize chained recurrences, so make
+; sure they aren't marked as post-inc users.
+;
+; CHECK-LABEL: IV Users for loop %test2.loop
+; CHECK: %sext.us = {0,+,(16777216 + (-16777216 * %sub.us))<nuw><nsw>,+,33554432}<%test2.loop> in %f = ashr i32 %sext.us, 24
+define i32 @test2() {
+entry:
+  br label %test2.loop
+
+test2.loop:
+  %inc1115.us = phi i32 [ 0, %entry ], [ %inc11.us, %test2.loop ]
+  %inc11.us = add nsw i32 %inc1115.us, 1
+  %cmp.us = icmp slt i32 %inc11.us, 2
+  br i1 %cmp.us, label %test2.loop, label %for.end
+
+for.end:
+  %tobool.us = icmp eq i32 %inc1115.us, 0
+  %sub.us = select i1 %tobool.us, i32 0, i32 0
+  %mul.us = shl i32 %inc1115.us, 24
+  %sub.cond.us = sub nsw i32 %inc1115.us, %sub.us
+  %sext.us = mul i32 %mul.us, %sub.cond.us
+  %f = ashr i32 %sext.us, 24
+  br label %exit
+
+exit:
+  ret i32 %f
+}