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[IC] Turn non-null MD on pointer loads to range MD on integer loads.

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Summary:
This change fixes the FIXME that you recently added when you committed
(a modified version of) my patch.  When `InstCombine` combines a load and
store of an pointer to those of an equivalently-sized integer, it currently
drops any `!nonnull` metadata that might be present.  This change replaces
`!nonnull` metadata with `!range !{ 1, -1 }` metadata instead.

Reviewers: chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7621

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230462 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Charles Davis
2015-02-25 05:10:25 +00:00
parent 465084ffcf
commit fba7e30f0f
4 changed files with 40 additions and 11 deletions
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3
include/llvm/IR/MDBuilder.h
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@@ -67,6 +67,9 @@ public:
/// \brief Return metadata describing the range [Lo, Hi).
MDNode *createRange(const APInt &Lo, const APInt &Hi);
/// \brief Return metadata describing the range [Lo, Hi).
MDNode *createRange(Constant *Lo, Constant *Hi);
//===------------------------------------------------------------------===//
// AA metadata.
//===------------------------------------------------------------------===//