Teach instsimplify how to simplify comparisons of pointers which are
constant-offsets of a common base using the generic GEP-walking logic
I added for computing pointer differences in the same situation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153419 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/Transforms/InstSimplify/compare.ll b/test/Transforms/InstSimplify/compare.ll
index e15bfaa..ced74bd 100644
--- a/test/Transforms/InstSimplify/compare.ll
+++ b/test/Transforms/InstSimplify/compare.ll
@@ -103,6 +103,68 @@
; CHECK: ret i1 %equal
}
+define i1 @gep9(i8* %ptr) {
+; CHECK: @gep9
+; CHECK-NOT: ret
+; CHECK: ret i1 true
+
+entry:
+ %first1 = getelementptr inbounds i8* %ptr, i32 0
+ %first2 = getelementptr inbounds i8* %first1, i32 1
+ %first3 = getelementptr inbounds i8* %first2, i32 2
+ %first4 = getelementptr inbounds i8* %first3, i32 4
+ %last1 = getelementptr inbounds i8* %first2, i32 48
+ %last2 = getelementptr inbounds i8* %last1, i32 8
+ %last3 = getelementptr inbounds i8* %last2, i32 -4
+ %last4 = getelementptr inbounds i8* %last3, i32 -4
+ %first.int = ptrtoint i8* %first4 to i32
+ %last.int = ptrtoint i8* %last4 to i32
+ %cmp = icmp ne i32 %last.int, %first.int
+ ret i1 %cmp
+}
+
+define i1 @gep10(i8* %ptr) {
+; CHECK: @gep10
+; CHECK-NOT: ret
+; CHECK: ret i1 true
+
+entry:
+ %first1 = getelementptr inbounds i8* %ptr, i32 -2
+ %first2 = getelementptr inbounds i8* %first1, i32 44
+ %last1 = getelementptr inbounds i8* %ptr, i32 48
+ %last2 = getelementptr inbounds i8* %last1, i32 -6
+ %first.int = ptrtoint i8* %first2 to i32
+ %last.int = ptrtoint i8* %last2 to i32
+ %cmp = icmp eq i32 %last.int, %first.int
+ ret i1 %cmp
+}
+
+define i1 @gep11(i8* %ptr) {
+; CHECK: @gep11
+; CHECK-NOT: ret
+; CHECK: ret i1 true
+
+entry:
+ %first1 = getelementptr inbounds i8* %ptr, i32 -2
+ %last1 = getelementptr inbounds i8* %ptr, i32 48
+ %last2 = getelementptr inbounds i8* %last1, i32 -6
+ %cmp = icmp ult i8* %first1, %last2
+ ret i1 %cmp
+}
+
+define i1 @gep12(i8* %ptr) {
+; CHECK: @gep12
+; CHECK-NOT: ret
+; CHECK: ret i1 %cmp
+
+entry:
+ %first1 = getelementptr inbounds i8* %ptr, i32 -2
+ %last1 = getelementptr inbounds i8* %ptr, i32 48
+ %last2 = getelementptr inbounds i8* %last1, i32 -6
+ %cmp = icmp slt i8* %first1, %last2
+ ret i1 %cmp
+}
+
define i1 @zext(i32 %x) {
; CHECK: @zext
%e1 = zext i32 %x to i64