48 lines
1.8 KiB
LLVM
48 lines
1.8 KiB
LLVM
; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=fiji -verify-machineinstrs < %s | FileCheck -check-prefix=GCN %s
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; GCN-LABEL: {{^}}private_load_maybe_divergent:
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; GCN: buffer_load_dword
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; GCN-NOT: s_load_dword s
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; GCN: flat_load_dword
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; GCN-NOT: s_load_dword s
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define amdgpu_kernel void @private_load_maybe_divergent(ptr addrspace(4) %k, ptr %flat) {
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%load = load volatile i32, ptr addrspace(5) poison, align 4
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%gep = getelementptr inbounds i32, ptr addrspace(4) %k, i32 %load
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%maybe.not.uniform.load = load i32, ptr addrspace(4) %gep, align 4
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store i32 %maybe.not.uniform.load, ptr addrspace(1) poison
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ret void
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}
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; GCN-LABEL: {{^}}flat_load_maybe_divergent:
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; GCN: s_load_dwordx4
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; GCN-NOT: s_load
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; GCN: flat_load_dword
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; GCN-NOT: s_load
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; GCN: flat_load_dword
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; GCN-NOT: s_load
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; GCN: flat_store_dword
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define amdgpu_kernel void @flat_load_maybe_divergent(ptr addrspace(4) %k, ptr %flat) {
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%load = load i32, ptr %flat, align 4
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%gep = getelementptr inbounds i32, ptr addrspace(4) %k, i32 %load
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%maybe.not.uniform.load = load i32, ptr addrspace(4) %gep, align 4
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store i32 %maybe.not.uniform.load, ptr addrspace(1) poison
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ret void
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}
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; This decomposes into a sequence of divergent sub carries. The first
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; subs in the sequence are divergent from the value inputs, but the
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; last values are divergent due to the carry in glue (such that
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; divergence needs to propagate through glue if there are any non-void
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; outputs)
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; GCN-LABEL: {{^}}wide_carry_divergence_error:
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; GCN: v_sub_u32_e32
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; GCN: v_subb_u32_e32
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; GCN: v_subb_u32_e32
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; GCN: v_subb_u32_e32
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define <2 x i128> @wide_carry_divergence_error(i128 %arg) {
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%i = call i128 @llvm.ctlz.i128(i128 %arg, i1 false)
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%i1 = sub i128 0, %i
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%i2 = insertelement <2 x i128> zeroinitializer, i128 %i1, i64 0
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ret <2 x i128> %i2
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}
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