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37c462f96a
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
131 lines
5.5 KiB
LLVM
131 lines
5.5 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 are three lds globals defined here, and these three lds are used respectively within
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; three non-kernel functions. There are three kernels, which call two of the non-kernel functions.
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; Hence pointer replacement should take place for all three lds, and pointer initialization within
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; kernel should selectively happen depending on which lds is reachable from the kernel.
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;
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; Original LDS should exist.
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; CHECK: @lds_used_within_function_1 = internal addrspace(3) global [1 x i32] undef, align 4
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; CHECK: @lds_used_within_function_2 = internal addrspace(3) global [2 x i32] undef, align 4
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; CHECK: @lds_used_within_function_3 = internal addrspace(3) global [3 x i32] undef, align 4
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@lds_used_within_function_1 = internal addrspace(3) global [1 x i32] undef, align 4
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@lds_used_within_function_2 = internal addrspace(3) global [2 x i32] undef, align 4
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@lds_used_within_function_3 = internal addrspace(3) global [3 x i32] undef, align 4
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; Pointers should be created.
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; CHECK: @lds_used_within_function_1.ptr = internal unnamed_addr addrspace(3) global i16 undef, align 2
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; CHECK: @lds_used_within_function_2.ptr = internal unnamed_addr addrspace(3) global i16 undef, align 2
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; CHECK: @lds_used_within_function_3.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_3() {
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; CHECK-LABEL: entry:
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; CHECK: %0 = load i16, i16 addrspace(3)* @lds_used_within_function_3.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 [3 x i32] addrspace(3)*
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; CHECK: %gep = getelementptr inbounds [3 x i32], [3 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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%gep = getelementptr inbounds [3 x i32], [3 x i32] addrspace(3)* @lds_used_within_function_3, i32 0, i32 0
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ret void
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}
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; Pointer replacement code should be added.
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define internal void @function_2() {
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; CHECK-LABEL: entry:
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; CHECK: %0 = load i16, i16 addrspace(3)* @lds_used_within_function_2.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 [2 x i32] addrspace(3)*
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; CHECK: %gep = getelementptr inbounds [2 x i32], [2 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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%gep = getelementptr inbounds [2 x i32], [2 x i32] addrspace(3)* @lds_used_within_function_2, i32 0, i32 0
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ret void
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}
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; Pointer replacement code should be added.
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define internal void @function_1() {
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; CHECK-LABEL: entry:
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; CHECK: %0 = load i16, i16 addrspace(3)* @lds_used_within_function_1.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: %gep = 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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%gep = getelementptr inbounds [1 x i32], [1 x i32] addrspace(3)* @lds_used_within_function_1, 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_calls_function_3_and_1() {
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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 ([3 x i32] addrspace(3)* @lds_used_within_function_3 to i16), i16 addrspace(3)* @lds_used_within_function_3.ptr, align 2
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; CHECK: store i16 ptrtoint ([1 x i32] addrspace(3)* @lds_used_within_function_1 to i16), i16 addrspace(3)* @lds_used_within_function_1.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_3()
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; CHECK: call void @function_1()
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; CHECK: ret void
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entry:
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call void @function_3()
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call void @function_1()
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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_calls_function_2_and_3() {
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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 ([3 x i32] addrspace(3)* @lds_used_within_function_3 to i16), i16 addrspace(3)* @lds_used_within_function_3.ptr, align 2
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; CHECK: store i16 ptrtoint ([2 x i32] addrspace(3)* @lds_used_within_function_2 to i16), i16 addrspace(3)* @lds_used_within_function_2.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_2()
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; CHECK: call void @function_3()
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; CHECK: ret void
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entry:
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call void @function_2()
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call void @function_3()
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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_calls_function_1_and_2() {
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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 ([2 x i32] addrspace(3)* @lds_used_within_function_2 to i16), i16 addrspace(3)* @lds_used_within_function_2.ptr, align 2
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; CHECK: store i16 ptrtoint ([1 x i32] addrspace(3)* @lds_used_within_function_1 to i16), i16 addrspace(3)* @lds_used_within_function_1.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_1()
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; CHECK: call void @function_2()
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; CHECK: ret void
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entry:
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call void @function_1()
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call void @function_2()
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ret void
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}
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