mirror of
https://github.com/c64scene-ar/llvm-6502.git
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a4bdf2ea48
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121945 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
2.6 KiB
LLVM
82 lines
2.6 KiB
LLVM
; RUN: opt < %s -tbaa -basicaa -functionattrs -S | FileCheck %s
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; FunctionAttrs should make use of TBAA.
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; Add the readnone attribute, since the only access is a store which TBAA
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; says is to constant memory.
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;
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; It's unusual to see a store to constant memory, but it isn't necessarily
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; invalid, as it's possible that this only happens after optimization on a
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; code path which isn't ever executed.
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; CHECK: define void @test0_yes(i32* nocapture %p) nounwind readnone {
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define void @test0_yes(i32* %p) nounwind {
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store i32 0, i32* %p, !tbaa !1
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ret void
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}
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; CHECK: define void @test0_no(i32* nocapture %p) nounwind {
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define void @test0_no(i32* %p) nounwind {
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store i32 0, i32* %p, !tbaa !2
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ret void
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}
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; Add the readonly attribute, since there's just a call to a function which
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; TBAA says doesn't modify any memory.
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; CHECK: define void @test1_yes(i32* %p) nounwind readonly {
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define void @test1_yes(i32* %p) nounwind {
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call void @callee(i32* %p), !tbaa !1
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ret void
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}
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; CHECK: define void @test1_no(i32* %p) nounwind {
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define void @test1_no(i32* %p) nounwind {
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call void @callee(i32* %p), !tbaa !2
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ret void
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}
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; Add the readonly attribute, as above, but this time BasicAA will say
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; that the function accesses memory through its arguments, which TBAA
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; still says that the function doesn't write to memory.
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;
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; This is unusual, since the function is memcpy, but as above, this
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; isn't necessarily invalid.
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; CHECK: define void @test2_yes(i8* nocapture %p, i8* nocapture %q, i64 %n) nounwind readnone {
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define void @test2_yes(i8* %p, i8* %q, i64 %n) nounwind {
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %p, i8* %q, i64 %n, i32 1, i1 false), !tbaa !1
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ret void
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}
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; CHECK: define void @test2_no(i8* nocapture %p, i8* nocapture %q, i64 %n) nounwind {
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define void @test2_no(i8* %p, i8* %q, i64 %n) nounwind {
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call void @llvm.memcpy.p0i8.p0i8.i64(i8* %p, i8* %q, i64 %n, i32 1, i1 false), !tbaa !2
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ret void
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}
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; Similar to the others, va_arg only accesses memory through its operand.
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; CHECK: define i32 @test3_yes(i8* nocapture %p) nounwind readnone {
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define i32 @test3_yes(i8* %p) nounwind {
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%t = va_arg i8* %p, i32, !tbaa !1
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ret i32 %t
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}
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; CHECK: define i32 @test3_no(i8* nocapture %p) nounwind {
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define i32 @test3_no(i8* %p) nounwind {
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%t = va_arg i8* %p, i32, !tbaa !2
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ret i32 %t
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}
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declare void @callee(i32* %p) nounwind
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8*, i8*, i64, i32, i1) nounwind
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; Root note.
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!0 = metadata !{ }
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; Invariant memory.
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!1 = metadata !{ metadata !"foo", metadata !0, i1 1 }
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; Not invariant memory.
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!2 = metadata !{ metadata !"foo", metadata !0, i1 0 }
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