656bf13004
This changes the AliasSetTracker to track memory locations instead of pointers in its alias sets. The motivation for this is outlined in an RFC posted on LLVM discourse: https://discourse.llvm.org/t/rfc-dont-merge-memory-locations-in-aliassettracker/73336 In the data structures of the AST implementation, I made the choice to replace the linked list of `PointerRec` entries (that had to go anyway) with a simple flat vector of `MemoryLocation` objects, but for the `AliasSet` objects referenced from a lookup table, I retained the mechanism of a linked list, reference counting, forwarding, etc. The data structures could be revised in a follow-up change.
49 lines
2.0 KiB
LLVM
49 lines
2.0 KiB
LLVM
; RUN: opt -passes=print-alias-sets -S -o - < %s 2>&1 | FileCheck %s
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@s = global i8 1, align 1
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@d = global i8 2, align 1
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; CHECK: Alias sets for function 'test_known_size':
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; CHECK: Alias Set Tracker: 1 alias sets for 1 pointer values.
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; CHECK: AliasSet[0x{{[0-9a-f]+}}, 1] must alias, Mod Memory locations: (ptr %d, LocationSize::precise(1))
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define void @test_known_size(ptr noalias %d) {
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entry:
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call void @llvm.memset.p0.i64(ptr align 1 %d, i8 0, i64 1, i1 false)
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ret void
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}
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; CHECK: Alias sets for function 'test_unknown_size':
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; CHECK: Alias Set Tracker: 1 alias sets for 1 pointer values.
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; CHECK: AliasSet[0x{{[0-9a-f]+}}, 1] must alias, Mod Memory locations: (ptr %d, unknown after)
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define void @test_unknown_size(ptr noalias %d, i64 %len) {
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entry:
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call void @llvm.memset.p0.i64(ptr align 1 %d, i8 0, i64 %len, i1 false)
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ret void
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}
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; CHECK: Alias sets for function 'test_atomic_known_size':
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; CHECK: Alias Set Tracker: 1 alias sets for 1 pointer values.
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; CHECK: AliasSet[0x{{[0-9a-f]+}}, 1] must alias, Mod Memory locations: (ptr %d, LocationSize::precise(1))
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define void @test_atomic_known_size(ptr noalias %d) {
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entry:
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call void @llvm.memset.element.unordered.atomic.p0.i32(ptr align 1 %d, i8 0, i64 1, i32 1)
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ret void
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}
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; CHECK: Alias sets for function 'test_atomic_unknown_size':
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; CHECK: Alias Set Tracker: 1 alias sets for 1 pointer values.
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; CHECK: AliasSet[0x{{[0-9a-f]+}}, 1] must alias, Mod Memory locations: (ptr %d, unknown after)
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define void @test_atomic_unknown_size(ptr noalias %d, i64 %len) {
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entry:
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call void @llvm.memset.element.unordered.atomic.p0.i32(ptr align 1 %d, i8 0, i64 %len, i32 1)
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ret void
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}
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declare void @llvm.memset.p0.i64(ptr %dest, i8 %val,
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i64 %len, i1 %isvolatile)
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declare void @llvm.memset.element.unordered.atomic.p0.i32(ptr %dest,
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i8 %value,
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i64 %len,
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i32 %element_size)
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