6ce7b1f861
Retrieve `!tbaa` metadata via `!tbaa.struct` in `adjustForAccess` unless it already exists, as struct-path aware `MDNodes` emitted via `new-struct-path-tbaa` may be leveraged. As `!tbaa.struct` carries memcpy padding semantics among struct fields and `!tbaa` is already meant to aid to alias semantics, it should be possible to zero out `!tbaa.struct` once the memcpy has been simplified. `SROA/tbaa-struct.ll` test has gone out of scope, as `!tbaa` has already replaced `!tbaa.struct` in SROA. Fixes: https://github.com/llvm/llvm-project/issues/95661.
90 lines
3.1 KiB
LLVM
90 lines
3.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
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; RUN: opt -passes=instcombine -S < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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declare void @llvm.memcpy.p0.p0.i64(ptr nocapture, ptr nocapture, i64, i1) nounwind
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; Verify that instcombine preserves TBAA tags when converting a memcpy into
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; a scalar load and store.
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%struct.test1 = type { float }
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define void @test1(ptr nocapture %a, ptr nocapture %b) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[B:%.*]], align 4, !tbaa [[TBAA0:![0-9]+]]
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; CHECK-NEXT: store i32 [[TMP0]], ptr [[A:%.*]], align 4, !tbaa [[TBAA0]]
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; CHECK-NEXT: ret void
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;
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entry:
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tail call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a, ptr align 4 %b, i64 4, i1 false), !tbaa.struct !3
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ret void
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}
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%struct.test2 = type { ptr }
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define ptr @test2() {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: store i1 true, ptr poison, align 1
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; CHECK-NEXT: ret ptr poison
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;
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%tmp = alloca %struct.test2, align 8
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call void @llvm.memcpy.p0.p0.i64(ptr align 8 %tmp, ptr align 8 undef, i64 8, i1 false), !tbaa.struct !4
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%tmp3 = load ptr, ptr %tmp
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ret ptr %tmp
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}
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define void @test3_multiple_fields(ptr nocapture %a, ptr nocapture %b) {
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; CHECK-LABEL: @test3_multiple_fields(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = load i64, ptr [[B:%.*]], align 4
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; CHECK-NEXT: store i64 [[TMP0]], ptr [[A:%.*]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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tail call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a, ptr align 4 %b, i64 8, i1 false), !tbaa.struct !6
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ret void
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}
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define void @test4_multiple_copy_first_field(ptr nocapture %a, ptr nocapture %b) {
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; CHECK-LABEL: @test4_multiple_copy_first_field(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[B:%.*]], align 4, !tbaa [[TBAA0]]
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; CHECK-NEXT: store i32 [[TMP0]], ptr [[A:%.*]], align 4, !tbaa [[TBAA0]]
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; CHECK-NEXT: ret void
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;
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entry:
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tail call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a, ptr align 4 %b, i64 4, i1 false), !tbaa.struct !6
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ret void
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}
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define void @test5_multiple_copy_more_than_first_field(ptr nocapture %a, ptr nocapture %b) {
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; CHECK-LABEL: @test5_multiple_copy_more_than_first_field(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[B:%.*]], align 4
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; CHECK-NEXT: store i32 [[TMP0]], ptr [[A:%.*]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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tail call void @llvm.memcpy.p0.p0.i64(ptr align 4 %a, ptr align 4 %b, i64 4, i1 false), !tbaa.struct !7
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ret void
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}
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!0 = !{!"Simple C/C++ TBAA"}
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!1 = !{!"omnipotent char", !0}
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!2 = !{!5, !5, i64 0}
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!3 = !{i64 0, i64 4, !2}
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!4 = !{i64 0, i64 8, null}
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!5 = !{!"float", !0}
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!6 = !{i64 0, i64 4, !2, i64 4, i64 4, !2}
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!7 = !{i64 0, i64 2, !2, i64 4, i64 6, !2}
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;.
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; CHECK: attributes #[[ATTR0:[0-9]+]] = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
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;.
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; CHECK: [[TBAA0]] = !{[[META1:![0-9]+]], [[META1]], i64 0}
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; CHECK: [[META1]] = !{!"float", [[META2:![0-9]+]]}
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; CHECK: [[META2]] = !{!"Simple C/C++ TBAA"}
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;.
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