1 ; RUN: opt -instcombine -S < %s | FileCheck %s 2 3 target datalayout = "e-m:e-p:64:64:64-i64:64-f80:128-n8:16:32:64-S128" 4 5 define i32 @test_load_cast_combine_tbaa(float* %ptr) { 6 ; Ensure (cast (load (...))) -> (load (cast (...))) preserves TBAA. 7 ; CHECK-LABEL: @test_load_cast_combine_tbaa( 8 ; CHECK: load i32, i32* %{{.*}}, !tbaa !0 9 entry: 10 %l = load float, float* %ptr, !tbaa !0 11 %c = bitcast float %l to i32 12 ret i32 %c 13 } 14 15 define i32 @test_load_cast_combine_noalias(float* %ptr) { 16 ; Ensure (cast (load (...))) -> (load (cast (...))) preserves no-alias metadata. 17 ; CHECK-LABEL: @test_load_cast_combine_noalias( 18 ; CHECK: load i32, i32* %{{.*}}, !alias.scope !2, !noalias !1 19 entry: 20 %l = load float, float* %ptr, !alias.scope !2, !noalias !1 21 %c = bitcast float %l to i32 22 ret i32 %c 23 } 24 25 define float @test_load_cast_combine_range(i32* %ptr) { 26 ; Ensure (cast (load (...))) -> (load (cast (...))) drops range metadata. It 27 ; would be nice to preserve or update it somehow but this is hard when moving 28 ; between types. 29 ; CHECK-LABEL: @test_load_cast_combine_range( 30 ; CHECK: load float, float* %{{.*}} 31 ; CHECK-NOT: !range 32 ; CHECK: ret float 33 entry: 34 %l = load i32, i32* %ptr, !range !6 35 %c = bitcast i32 %l to float 36 ret float %c 37 } 38 39 define i32 @test_load_cast_combine_invariant(float* %ptr) { 40 ; Ensure (cast (load (...))) -> (load (cast (...))) preserves invariant metadata. 41 ; CHECK-LABEL: @test_load_cast_combine_invariant( 42 ; CHECK: load i32, i32* %{{.*}}, !invariant.load !3 43 entry: 44 %l = load float, float* %ptr, !invariant.load !3 45 %c = bitcast float %l to i32 46 ret i32 %c 47 } 48 49 define i32 @test_load_cast_combine_nontemporal(float* %ptr) { 50 ; Ensure (cast (load (...))) -> (load (cast (...))) preserves nontemporal 51 ; metadata. 52 ; CHECK-LABEL: @test_load_cast_combine_nontemporal( 53 ; CHECK: load i32, i32* %{{.*}}, !nontemporal !4 54 entry: 55 %l = load float, float* %ptr, !nontemporal !4 56 %c = bitcast float %l to i32 57 ret i32 %c 58 } 59 60 define i8* @test_load_cast_combine_align(i32** %ptr) { 61 ; Ensure (cast (load (...))) -> (load (cast (...))) preserves align 62 ; metadata. 63 ; CHECK-LABEL: @test_load_cast_combine_align( 64 ; CHECK: load i8*, i8** %{{.*}}, !align !5 65 entry: 66 %l = load i32*, i32** %ptr, !align !5 67 %c = bitcast i32* %l to i8* 68 ret i8* %c 69 } 70 71 define i8* @test_load_cast_combine_deref(i32** %ptr) { 72 ; Ensure (cast (load (...))) -> (load (cast (...))) preserves dereferenceable 73 ; metadata. 74 ; CHECK-LABEL: @test_load_cast_combine_deref( 75 ; CHECK: load i8*, i8** %{{.*}}, !dereferenceable !5 76 entry: 77 %l = load i32*, i32** %ptr, !dereferenceable !5 78 %c = bitcast i32* %l to i8* 79 ret i8* %c 80 } 81 82 define i8* @test_load_cast_combine_deref_or_null(i32** %ptr) { 83 ; Ensure (cast (load (...))) -> (load (cast (...))) preserves 84 ; dereferenceable_or_null metadata. 85 ; CHECK-LABEL: @test_load_cast_combine_deref_or_null( 86 ; CHECK: load i8*, i8** %{{.*}}, !dereferenceable_or_null !5 87 entry: 88 %l = load i32*, i32** %ptr, !dereferenceable_or_null !5 89 %c = bitcast i32* %l to i8* 90 ret i8* %c 91 } 92 93 define void @test_load_cast_combine_loop(float* %src, i32* %dst, i32 %n) { 94 ; Ensure (cast (load (...))) -> (load (cast (...))) preserves loop access 95 ; metadata. 96 ; CHECK-LABEL: @test_load_cast_combine_loop( 97 ; CHECK: load i32, i32* %{{.*}}, !llvm.mem.parallel_loop_access !1 98 entry: 99 br label %loop 100 101 loop: 102 %i = phi i32 [ 0, %entry ], [ %i.next, %loop ] 103 %src.gep = getelementptr inbounds float, float* %src, i32 %i 104 %dst.gep = getelementptr inbounds i32, i32* %dst, i32 %i 105 %l = load float, float* %src.gep, !llvm.mem.parallel_loop_access !1 106 %c = bitcast float %l to i32 107 store i32 %c, i32* %dst.gep 108 %i.next = add i32 %i, 1 109 %cmp = icmp slt i32 %i.next, %n 110 br i1 %cmp, label %loop, label %exit, !llvm.loop !1 111 112 exit: 113 ret void 114 } 115 116 define void @test_load_cast_combine_nonnull(float** %ptr) { 117 ; We can't preserve nonnull metadata when converting a load of a pointer to 118 ; a load of an integer. Instead, we translate it to range metadata. 119 ; FIXME: We should also transform range metadata back into nonnull metadata. 120 ; FIXME: This test is very fragile. If any LABEL lines are added after 121 ; this point, the test will fail, because this test depends on a metadata tuple, 122 ; which is always emitted at the end of the file. At some point, we should 123 ; consider an option to the IR printer to emit MD tuples after the function 124 ; that first uses them--this will allow us to refer to them like this and not 125 ; have the tests break. For now, this function must always come last in this 126 ; file, and no LABEL lines are to be added after this point. 127 ; 128 ; CHECK-LABEL: @test_load_cast_combine_nonnull( 129 ; CHECK: %[[V:.*]] = load i64, i64* %{{.*}}, !range ![[MD:[0-9]+]] 130 ; CHECK-NOT: !nonnull 131 ; CHECK: store i64 %[[V]], i64* 132 entry: 133 %p = load float*, float** %ptr, !nonnull !3 134 %gep = getelementptr float*, float** %ptr, i32 42 135 store float* %p, float** %gep 136 ret void 137 } 138 139 ; This is the metadata tuple that we reference above: 140 ; CHECK: ![[MD]] = !{i64 1, i64 0} 141 !0 = !{ !1, !1, i64 0 } 142 !1 = !{ !1 } 143 !2 = !{ !2, !1 } 144 !3 = !{ } 145 !4 = !{ i32 1 } 146 !5 = !{ i64 8 } 147 !6 = !{ i32 0, i32 42 } 148
