237 lines
7.0 KiB
LLVM
237 lines
7.0 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S < %s -instcombine | FileCheck %s
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;; Start by showing the results of constant folding (which doesn't use
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;; the poison implied by gep for the nonnull cases).
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define i1 @test_ne_constants_null() {
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; CHECK-LABEL: @test_ne_constants_null(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i1 false
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;
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entry:
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%gep = getelementptr inbounds i8, i8* null, i64 0
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%cnd = icmp ne i8* %gep, null
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ret i1 %cnd
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}
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define i1 @test_ne_constants_nonnull() {
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; CHECK-LABEL: @test_ne_constants_nonnull(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i1 true
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;
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entry:
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%gep = getelementptr inbounds i8, i8* null, i64 1
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%cnd = icmp ne i8* %gep, null
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ret i1 %cnd
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}
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define i1 @test_eq_constants_null() {
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; CHECK-LABEL: @test_eq_constants_null(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i1 true
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;
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entry:
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%gep = getelementptr inbounds i8, i8* null, i64 0
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%cnd = icmp eq i8* %gep, null
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ret i1 %cnd
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}
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define i1 @test_eq_constants_nonnull() {
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; CHECK-LABEL: @test_eq_constants_nonnull(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i1 false
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;
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entry:
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%gep = getelementptr inbounds i8, i8* null, i64 1
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%cnd = icmp eq i8* %gep, null
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ret i1 %cnd
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}
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;; Then show the results for non-constants. These use the inbounds provided
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;; UB fact to ignore the possible overflow cases.
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define i1 @test_ne(i8* %base, i64 %idx) {
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; CHECK-LABEL: @test_ne(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CND:%.*]] = icmp ne i8* [[BASE:%.*]], null
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; CHECK-NEXT: ret i1 [[CND]]
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;
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entry:
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%gep = getelementptr inbounds i8, i8* %base, i64 %idx
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%cnd = icmp ne i8* %gep, null
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ret i1 %cnd
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}
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define i1 @test_eq(i8* %base, i64 %idx) {
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; CHECK-LABEL: @test_eq(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CND:%.*]] = icmp eq i8* [[BASE:%.*]], null
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; CHECK-NEXT: ret i1 [[CND]]
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;
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entry:
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%gep = getelementptr inbounds i8, i8* %base, i64 %idx
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%cnd = icmp eq i8* %gep, null
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ret i1 %cnd
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}
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define <2 x i1> @test_vector_base(<2 x i8*> %base, i64 %idx) {
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; CHECK-LABEL: @test_vector_base(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CND:%.*]] = icmp eq <2 x i8*> [[BASE:%.*]], zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[CND]]
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;
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entry:
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%gep = getelementptr inbounds i8, <2 x i8*> %base, i64 %idx
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%cnd = icmp eq <2 x i8*> %gep, zeroinitializer
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ret <2 x i1> %cnd
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}
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define <2 x i1> @test_vector_index(i8* %base, <2 x i64> %idx) {
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; CHECK-LABEL: @test_vector_index(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[DOTSPLATINSERT:%.*]] = insertelement <2 x i8*> poison, i8* [[BASE:%.*]], i32 0
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; CHECK-NEXT: [[TMP0:%.*]] = icmp eq <2 x i8*> [[DOTSPLATINSERT]], zeroinitializer
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; CHECK-NEXT: [[CND:%.*]] = shufflevector <2 x i1> [[TMP0]], <2 x i1> undef, <2 x i32> zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[CND]]
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;
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entry:
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%gep = getelementptr inbounds i8, i8* %base, <2 x i64> %idx
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%cnd = icmp eq <2 x i8*> %gep, zeroinitializer
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ret <2 x i1> %cnd
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}
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define <2 x i1> @test_vector_both(<2 x i8*> %base, <2 x i64> %idx) {
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; CHECK-LABEL: @test_vector_both(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CND:%.*]] = icmp eq <2 x i8*> [[BASE:%.*]], zeroinitializer
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; CHECK-NEXT: ret <2 x i1> [[CND]]
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;
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entry:
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%gep = getelementptr inbounds i8, <2 x i8*> %base, <2 x i64> %idx
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%cnd = icmp eq <2 x i8*> %gep, zeroinitializer
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ret <2 x i1> %cnd
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}
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;; These two show instsimplify's reasoning getting to the non-zero offsets
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;; before instcombine does.
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define i1 @test_eq_pos_idx(i8* %base) {
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; CHECK-LABEL: @test_eq_pos_idx(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i1 false
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;
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entry:
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%gep = getelementptr inbounds i8, i8* %base, i64 1
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%cnd = icmp eq i8* %gep, null
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ret i1 %cnd
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}
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define i1 @test_eq_neg_idx(i8* %base) {
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; CHECK-LABEL: @test_eq_neg_idx(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i1 false
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;
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entry:
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%gep = getelementptr inbounds i8, i8* %base, i64 -1
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%cnd = icmp eq i8* %gep, null
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ret i1 %cnd
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}
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;; Show an example with a zero sized type since that's
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;; a cornercase which keeps getting mentioned. The GEP
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;; produces %base regardless of the value of the index
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;; expression.
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define i1 @test_size0({}* %base, i64 %idx) {
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; CHECK-LABEL: @test_size0(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CND:%.*]] = icmp ne {}* [[BASE:%.*]], null
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; CHECK-NEXT: ret i1 [[CND]]
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;
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entry:
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%gep = getelementptr inbounds {}, {}* %base, i64 %idx
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%cnd = icmp ne {}* %gep, null
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ret i1 %cnd
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}
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define i1 @test_size0_nonzero_offset({}* %base) {
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; CHECK-LABEL: @test_size0_nonzero_offset(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CND:%.*]] = icmp ne {}* [[BASE:%.*]], null
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; CHECK-NEXT: ret i1 [[CND]]
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;
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entry:
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%gep = getelementptr inbounds {}, {}* %base, i64 15
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%cnd = icmp ne {}* %gep, null
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ret i1 %cnd
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}
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define i1 @test_index_type([10 x i8]* %base, i64 %idx) {
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; CHECK-LABEL: @test_index_type(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CND:%.*]] = icmp eq [10 x i8]* [[BASE:%.*]], null
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; CHECK-NEXT: ret i1 [[CND]]
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;
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entry:
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%gep = getelementptr inbounds [10 x i8], [10 x i8]* %base, i64 %idx, i64 %idx
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%cnd = icmp eq i8* %gep, null
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ret i1 %cnd
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}
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;; Finally, some negative tests for sanity checking.
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define i1 @neq_noinbounds(i8* %base, i64 %idx) {
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; CHECK-LABEL: @neq_noinbounds(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr i8, i8* [[BASE:%.*]], i64 [[IDX:%.*]]
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; CHECK-NEXT: [[CND:%.*]] = icmp ne i8* [[GEP]], null
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; CHECK-NEXT: ret i1 [[CND]]
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;
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entry:
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%gep = getelementptr i8, i8* %base, i64 %idx
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%cnd = icmp ne i8* %gep, null
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ret i1 %cnd
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}
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define i1 @neg_objectatnull(i8 addrspace(2)* %base, i64 %idx) {
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; CHECK-LABEL: @neg_objectatnull(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[GEP:%.*]] = getelementptr inbounds i8, i8 addrspace(2)* [[BASE:%.*]], i64 [[IDX:%.*]]
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; CHECK-NEXT: [[CND:%.*]] = icmp eq i8 addrspace(2)* [[GEP]], null
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; CHECK-NEXT: ret i1 [[CND]]
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;
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entry:
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%gep = getelementptr inbounds i8, i8 addrspace(2)* %base, i64 %idx
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%cnd = icmp eq i8 addrspace(2)* %gep, null
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ret i1 %cnd
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}
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; Test for an assert from trying to create an invalid constantexpr
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; bitcast between different address spaces. The addrspacecast is
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; stripped off and the addrspace(0) null can be treated as invalid.
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; FIXME: This should be able to fold to ret i1 false
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define i1 @invalid_bitcast_icmp_addrspacecast_as0_null(i32 addrspace(5)* %ptr) {
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; CHECK-LABEL: @invalid_bitcast_icmp_addrspacecast_as0_null(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 addrspace(5)* [[PTR:%.*]], addrspacecast (i32* null to i32 addrspace(5)*)
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; CHECK-NEXT: ret i1 [[TMP2]]
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;
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bb:
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%tmp1 = getelementptr inbounds i32, i32 addrspace(5)* %ptr, i32 1
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%tmp2 = icmp eq i32 addrspace(5)* %tmp1, addrspacecast (i32* null to i32 addrspace(5)*)
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ret i1 %tmp2
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}
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define i1 @invalid_bitcast_icmp_addrspacecast_as0_null_var(i32 addrspace(5)* %ptr, i32 %idx) {
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; CHECK-LABEL: @invalid_bitcast_icmp_addrspacecast_as0_null_var(
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; CHECK-NEXT: bb:
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; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 addrspace(5)* [[PTR:%.*]], addrspacecast (i32* null to i32 addrspace(5)*)
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; CHECK-NEXT: ret i1 [[TMP2]]
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;
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bb:
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%tmp1 = getelementptr inbounds i32, i32 addrspace(5)* %ptr, i32 %idx
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%tmp2 = icmp eq i32 addrspace(5)* %tmp1, addrspacecast (i32* null to i32 addrspace(5)*)
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ret i1 %tmp2
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}
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