[PATCH] D19935: [BasicAA] Compare GEP indices based on value
Vedant Kumar via llvm-commits
llvm-commits at lists.llvm.org
Fri May 6 13:34:53 PDT 2016
vsk updated this revision to Diff 56454.
vsk added a comment.
- Updated with Ahmed's suggested test case.
http://reviews.llvm.org/D19935
Files:
lib/Analysis/BasicAliasAnalysis.cpp
test/Analysis/BasicAA/struct-geps.ll
Index: test/Analysis/BasicAA/struct-geps.ll
===================================================================
--- test/Analysis/BasicAA/struct-geps.ll
+++ test/Analysis/BasicAA/struct-geps.ll
@@ -162,3 +162,12 @@
%y = getelementptr %struct2, %struct2* %st, i32 0, i32 0, i32 1, i32 1
ret void
}
+
+; PR27418 - Treat GEP indices with the same value but different types the same
+; CHECK-LABEL: test_different_index_types
+; CHECK: MustAlias: i16* %tmp1, i16* %tmp2
+define void @test_different_index_types([2 x i16]* %arr) {
+ %tmp1 = getelementptr [2 x i16], [2 x i16]* %arr, i16 0, i32 1
+ %tmp2 = getelementptr [2 x i16], [2 x i16]* %arr, i16 0, i16 1
+ ret void
+}
Index: lib/Analysis/BasicAliasAnalysis.cpp
===================================================================
--- lib/Analysis/BasicAliasAnalysis.cpp
+++ lib/Analysis/BasicAliasAnalysis.cpp
@@ -819,7 +819,7 @@
// If the last (struct) indices are constants and are equal, the other indices
// might be also be dynamically equal, so the GEPs can alias.
- if (C1 && C2 && C1 == C2)
+ if (C1 && C2 && C1->getSExtValue() == C2->getSExtValue())
return MayAlias;
// Find the last-indexed type of the GEP, i.e., the type you'd get if
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