261580cacd
We can fold ptrdiff(ptradd(p, x), p) to x regardless of whether the ptradd is inbounds. Proof: https://alive2.llvm.org/ce/z/Xuvc7N
72 lines
2.2 KiB
LLVM
72 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instsimplify -S | FileCheck %s
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define i64 @ptrdiff(ptr %ptr) {
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; CHECK-LABEL: @ptrdiff(
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; CHECK-NEXT: ret i64 42
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;
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%last = getelementptr inbounds i8, ptr %ptr, i32 42
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%first.int = ptrtoint ptr %ptr to i64
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%last.int = ptrtoint ptr %last to i64
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%diff = sub i64 %last.int, %first.int
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ret i64 %diff
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}
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define i64 @ptrdiff_no_inbounds(ptr %ptr) {
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; CHECK-LABEL: @ptrdiff_no_inbounds(
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; CHECK-NEXT: ret i64 42
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;
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%last = getelementptr i8, ptr %ptr, i32 42
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%first.int = ptrtoint ptr %ptr to i64
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%last.int = ptrtoint ptr %last to i64
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%diff = sub i64 %last.int, %first.int
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ret i64 %diff
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}
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define i64 @ptrdiff_chain(ptr %ptr) {
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; CHECK-LABEL: @ptrdiff_chain(
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; CHECK-NEXT: ret i64 42
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;
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%first2 = getelementptr inbounds i8, ptr %ptr, i32 1
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%first3 = getelementptr inbounds i8, ptr %first2, i32 2
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%first4 = getelementptr inbounds i8, ptr %first3, i32 4
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%last1 = getelementptr inbounds i8, ptr %first2, i32 48
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%last2 = getelementptr inbounds i8, ptr %last1, i32 8
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%last3 = getelementptr inbounds i8, ptr %last2, i32 -4
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%last4 = getelementptr inbounds i8, ptr %last3, i32 -4
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%first.int = ptrtoint ptr %first4 to i64
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%last.int = ptrtoint ptr %last4 to i64
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%diff = sub i64 %last.int, %first.int
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ret i64 %diff
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}
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; Handle simple cases of vectors of pointers.
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define <4 x i32> @ptrdiff_vectors(<4 x ptr> %arg) nounwind {
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; CHECK-LABEL: @ptrdiff_vectors(
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; CHECK-NEXT: ret <4 x i32> zeroinitializer
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;
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%p1 = ptrtoint <4 x ptr> %arg to <4 x i32>
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%bc = bitcast <4 x ptr> %arg to <4 x ptr>
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%p2 = ptrtoint <4 x ptr> %bc to <4 x i32>
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%sub = sub <4 x i32> %p1, %p2
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ret <4 x i32> %sub
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}
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%struct.ham = type { i32, [2 x [2 x i32]] }
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@global = internal global %struct.ham zeroinitializer, align 4
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define i32 @ptrdiff_global() nounwind {
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; CHECK-LABEL: @ptrdiff_global(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: ret i32 0
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;
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bb:
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%tmp = getelementptr inbounds %struct.ham, ptr @global, i32 0, i32 1
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%tmp3 = ptrtoint ptr %tmp to i32
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%tmp4 = getelementptr inbounds %struct.ham, ptr @global, i32 0, i32 1
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%tmp6 = ptrtoint ptr %tmp4 to i32
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%tmp7 = sub i32 %tmp3, %tmp6
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ret i32 %tmp7
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}
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