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Perform DAG combine: and (srl x, c), mask => shl (bfe x, nb + c, mask >> nb), nb Where nb is a number of trailing zeroes in mask. It replaces two instructions with two and BFE is generally a more expensive one. However this is only done if we are selecting a byte or word at an aligned boundary which results in a proper SDWA operand pattern. It is only done if SDWA is supported. TODO: improve SDWA pass to actually convert this pattern. It is not done now because we have an immediate in the instruction, which has be moved into a VGPR. Differential Revision: https://reviews.llvm.org/D33455 llvm-svn: 303681
42 lines
1.8 KiB
LLVM
42 lines
1.8 KiB
LLVM
; RUN: llc -march=amdgcn -mcpu=fiji < %s | FileCheck --check-prefix=GCN --check-prefix=VI %s
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; RUN: llc -march=amdgcn -mcpu=bonaire < %s | FileCheck --check-prefix=GCN --check-prefix=CI %s
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; GCN-LABEL: {{^}}bfe_combine8:
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; VI: v_bfe_u32 v[[BFE:[0-9]+]], v{{[0-9]+}}, 8, 8
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; VI: v_lshlrev_b32_e32 v[[ADDRBASE:[0-9]+]], 2, v[[BFE]]
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; CI: v_lshrrev_b32_e32 v[[SHR:[0-9]+]], 6, v{{[0-9]+}}
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; CI: v_and_b32_e32 v[[ADDRLO:[0-9]+]], 0x3fc, v[[SHR]]
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; VI: v_add_i32_e32 v[[ADDRLO:[0-9]+]], vcc, s{{[0-9]+}}, v[[ADDRBASE]]
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; GCN: load_dword v{{[0-9]+}}, v{{\[}}[[ADDRLO]]:
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define amdgpu_kernel void @bfe_combine8(i32 addrspace(1)* nocapture %arg, i32 %x) {
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%id = tail call i32 @llvm.amdgcn.workitem.id.x() #2
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%idx = add i32 %x, %id
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%srl = lshr i32 %idx, 8
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%and = and i32 %srl, 255
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%ptr = getelementptr inbounds i32, i32 addrspace(1)* %arg, i32 %and
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%val = load i32, i32 addrspace(1)* %ptr, align 4
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store i32 %val, i32 addrspace(1)* %arg, align 4
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ret void
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}
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; GCN-LABEL: {{^}}bfe_combine16:
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; VI: v_bfe_u32 v[[BFE:[0-9]+]], v{{[0-9]+}}, 16, 16
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; VI: v_lshlrev_b32_e32 v[[ADDRBASE:[0-9]+]], {{[^,]+}}, v[[BFE]]
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; CI: v_lshrrev_b32_e32 v[[SHR:[0-9]+]], 1, v{{[0-9]+}}
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; CI: v_and_b32_e32 v[[AND:[0-9]+]], 0x7fff8000, v[[SHR]]
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; CI: v_lshl_b64 v{{\[}}[[ADDRLO:[0-9]+]]:{{[^\]+}}], v{{\[}}[[AND]]:{{[^\]+}}], 2
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; VI: v_add_i32_e32 v[[ADDRLO:[0-9]+]], vcc, s{{[0-9]+}}, v[[ADDRBASE]]
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; GCN: load_dword v{{[0-9]+}}, v{{\[}}[[ADDRLO]]:
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define amdgpu_kernel void @bfe_combine16(i32 addrspace(1)* nocapture %arg, i32 %x) {
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%id = tail call i32 @llvm.amdgcn.workitem.id.x() #2
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%idx = add i32 %x, %id
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%srl = lshr i32 %idx, 1
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%and = and i32 %srl, 2147450880
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%ptr = getelementptr inbounds i32, i32 addrspace(1)* %arg, i32 %and
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%val = load i32, i32 addrspace(1)* %ptr, align 4
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store i32 %val, i32 addrspace(1)* %arg, align 4
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ret void
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}
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declare i32 @llvm.amdgcn.workitem.id.x() #1
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