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https://github.com/c64scene-ar/llvm-6502.git
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ee6d5d1c9e
The motivation is to allow GatherAllAliases / FindBetterChain to not give up on dependent loads of a pointer from constant memory. This is important for AMDGPU, because most loads are pointers derived from a load of a kernel argument from constant memory. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241948 91177308-0d34-0410-b5e6-96231b3b80d8
35 lines
1.7 KiB
LLVM
35 lines
1.7 KiB
LLVM
; RUN: llc -march=amdgcn -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
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; GatherAllAliases gives up on trying to analyze cases where the
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; pointer may have been loaded from an aliased store, so make sure
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; that this works and allows moving the stores to a better chain to
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; allow them to be merged merged when it's clear the pointer is loaded
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; from constant/invariant memory.
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; GCN-LABEL: {{^}}test_merge_store_constant_i16_invariant_global_pointer_load:
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; GCN: buffer_load_dwordx2 [[PTR:v\[[0-9]+:[0-9]+\]]],
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; GCN: v_mov_b32_e32 [[K:v[0-9]+]], 0x1c8007b
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; GCN: buffer_store_dword [[K]], [[PTR]]
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define void @test_merge_store_constant_i16_invariant_global_pointer_load(i16 addrspace(1)* addrspace(1)* dereferenceable(4096) nonnull %in) #0 {
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%ptr = load i16 addrspace(1)*, i16 addrspace(1)* addrspace(1)* %in, !invariant.load !0
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%ptr.1 = getelementptr i16, i16 addrspace(1)* %ptr, i64 1
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store i16 123, i16 addrspace(1)* %ptr, align 4
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store i16 456, i16 addrspace(1)* %ptr.1
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ret void
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}
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; GCN-LABEL: {{^}}test_merge_store_constant_i16_invariant_constant_pointer_load:
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; GCN: s_load_dwordx2 s{{\[}}[[SPTR_LO:[0-9]+]]:[[SPTR_HI:[0-9]+]]{{\]}}
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; GCN: v_mov_b32_e32 [[K:v[0-9]+]], 0x1c8007b
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; GCN: buffer_store_dword [[K]], s{{\[}}[[SPTR_LO]]:
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define void @test_merge_store_constant_i16_invariant_constant_pointer_load(i16 addrspace(1)* addrspace(2)* dereferenceable(4096) nonnull %in) #0 {
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%ptr = load i16 addrspace(1)*, i16 addrspace(1)* addrspace(2)* %in, !invariant.load !0
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%ptr.1 = getelementptr i16, i16 addrspace(1)* %ptr, i64 1
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store i16 123, i16 addrspace(1)* %ptr, align 4
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store i16 456, i16 addrspace(1)* %ptr.1
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ret void
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}
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!0 = !{}
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attributes #0 = { nounwind } |