This patch teaches ScalarEvolution to pick and use !range metadata.

It also makes it more aggressive in querying range information by
adding a call to isKnownPredicateWithRanges to
isLoopBackedgeGuardedByCond and isLoopEntryGuardedByCond.

phabricator: http://reviews.llvm.org/D5638

Reviewed by: atrick, hfinkel

llvm-svn: 219532

1 files changed, 37 insertions, 0 deletions

diff --git a/llvm/test/Transforms/IndVarSimplify/use-range-metadata.ll b/llvm/test/Transforms/IndVarSimplify/use-range-metadata.ll
new file mode 100644
index 00000000000..7ac4f11bc2e
--- /dev/null
+++ b/llvm/test/Transforms/IndVarSimplify/use-range-metadata.ll
@@ -0,0 +1,37 @@
+;; RUN: opt -S < %s -indvars | FileCheck %s
+
+;; Check if IndVarSimplify understands !range metadata.
+
+declare void @abort()
+
+define i1 @iterate(i32* nocapture readonly %buffer) {
+entry:
+  %length = load i32* %buffer, !range !0
+  br label %loop.preheader
+
+loop.preheader:
+  br label %loop
+
+loop:
+  %idx = phi i32 [ %idx.inc, %loop.next ], [ 0, %loop.preheader ]
+  %oob.pred = icmp slt i32 %idx, %length
+  br i1 %oob.pred, label %loop.next, label %oob
+; CHECK: br i1 true, label %loop.next, label %oob
+
+loop.next:
+  %idx.inc = add i32 %idx, 1
+  %exit.pred = icmp slt i32 %idx.inc, %length
+  br i1 %exit.pred, label %loop, label %abort.loopexit
+
+abort.loopexit:
+  br label %abort
+
+abort:
+  ret i1 false
+
+oob:
+  tail call void @abort()
+  ret i1 false
+}
+
+!0 = metadata !{i32 1, i32 100}