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The main motivation behind pointer replacement of LDS use within non-kernel functions is - to *avoid* subsequent LDS lowering pass from directly packing LDS (assume large LDS) into a struct type which would otherwise cause allocating huge memory for struct instance within every kernel. Reviewed By: rampitec Differential Revision: https://reviews.llvm.org/D103225
54 lines
2.1 KiB
LLVM
54 lines
2.1 KiB
LLVM
; RUN: opt -S -mtriple=amdgcn-- -amdgpu-replace-lds-use-with-pointer < %s | FileCheck %s
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; DESCRIPTION:
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;
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; There is one lds global defined here, and this lds is used within a single non-kernel
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; function multiple times, and this non-kernel function is reachable from kernel. Hence
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; pointer takes place. But important note is - store-to/load-from pointer should happen
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; only once irrespective of number of uses.
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;
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; Original LDS should exist.
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; CHECK: @lds1 = internal addrspace(3) global [1 x i32] undef, align 4
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@lds1 = internal addrspace(3) global [1 x i32] undef, align 4
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; Pointers should be created.
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; CHECK: @lds1.ptr = internal unnamed_addr addrspace(3) global i16 undef, align 2
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; Pointer replacement code should be added.
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define internal void @function() {
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; CHECK-LABEL: entry:
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; CHECK: %0 = load i16, i16 addrspace(3)* @lds1.ptr, align 2
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; CHECK: %1 = getelementptr i8, i8 addrspace(3)* null, i16 %0
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; CHECK: %2 = bitcast i8 addrspace(3)* %1 to [1 x i32] addrspace(3)*
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; CHECK: %gep1 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* %2, i32 0, i32 0
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; CHECK: %gep2 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* %2, i32 0, i32 0
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; CHECK: %gep3 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* %2, i32 0, i32 0
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; CHECK: ret void
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entry:
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%gep1 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* @lds1, i32 0, i32 0
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%gep2 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* @lds1, i32 0, i32 0
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%gep3 = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* @lds1, i32 0, i32 0
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ret void
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}
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; Pointer initialization code shoud be added;
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define protected amdgpu_kernel void @kernel() {
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; CHECK-LABEL: entry:
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; CHECK: %0 = call i32 @llvm.amdgcn.mbcnt.lo(i32 -1, i32 0)
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; CHECK: %1 = icmp eq i32 %0, 0
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; CHECK: br i1 %1, label %2, label %3
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;
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; CHECK-LABEL: 2:
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; CHECK: store i16 ptrtoint ([1 x i32] addrspace(3)* @lds1 to i16), i16 addrspace(3)* @lds1.ptr, align 2
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; CHECK: br label %3
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;
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; CHECK-LABEL: 3:
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; CHECK: call void @llvm.amdgcn.wave.barrier()
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; CHECK: call void @function()
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; CHECK: ret void
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entry:
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call void @function()
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ret void
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}
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