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def314d5bf
o Before this patch, BPF backend will expand UNDEF node
to i64 constant 0.
o For second pass of dag combiner, legalizer will run through
each to-be-processed dag node.
o If any new SDNode is generated and has an undef operand,
dag combiner will put undef node, newly-generated constant-0 node,
and any node which uses these nodes in the working list.
o During this process, it is possible undef operand is
generated again, and this will form an infinite loop
for dag combiner pass2.
o This patch allows UNDEF to be a legal type.
Signed-off-by: Yonghong Song <yhs@plumgrid.com>
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
llvm-svn: 249718
69 lines
3.2 KiB
LLVM
69 lines
3.2 KiB
LLVM
; RUN: llc < %s -march=bpf | FileCheck %s
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%struct.bpf_map_def = type { i32, i32, i32, i32 }
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%struct.__sk_buff = type opaque
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%struct.routing_key_2 = type { [6 x i8] }
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@routing = global %struct.bpf_map_def { i32 1, i32 6, i32 12, i32 1024 }, section "maps", align 4
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@routing_miss_0 = global %struct.bpf_map_def { i32 1, i32 1, i32 12, i32 1 }, section "maps", align 4
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@test1 = global %struct.bpf_map_def { i32 2, i32 4, i32 8, i32 1024 }, section "maps", align 4
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@test1_miss_4 = global %struct.bpf_map_def { i32 2, i32 1, i32 8, i32 1 }, section "maps", align 4
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@_license = global [4 x i8] c"GPL\00", section "license", align 1
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@llvm.used = appending global [6 x i8*] [i8* getelementptr inbounds ([4 x i8], [4 x i8]* @_license, i32 0, i32 0), i8* bitcast (i32 (%struct.__sk_buff*)* @ebpf_filter to i8*), i8* bitcast (%struct.bpf_map_def* @routing to i8*), i8* bitcast (%struct.bpf_map_def* @routing_miss_0 to i8*), i8* bitcast (%struct.bpf_map_def* @test1 to i8*), i8* bitcast (%struct.bpf_map_def* @test1_miss_4 to i8*)], section "llvm.metadata"
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; Function Attrs: nounwind uwtable
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define i32 @ebpf_filter(%struct.__sk_buff* nocapture readnone %ebpf_packet) #0 section "socket1" {
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%key = alloca %struct.routing_key_2, align 1
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%1 = getelementptr inbounds %struct.routing_key_2, %struct.routing_key_2* %key, i64 0, i32 0, i64 0
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; CHECK: mov r1, 5
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; CHECK: stb -8(r10), r1
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store i8 5, i8* %1, align 1
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%2 = getelementptr inbounds %struct.routing_key_2, %struct.routing_key_2* %key, i64 0, i32 0, i64 1
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; CHECK: mov r1, 6
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; CHECK: stb -7(r10), r1
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store i8 6, i8* %2, align 1
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%3 = getelementptr inbounds %struct.routing_key_2, %struct.routing_key_2* %key, i64 0, i32 0, i64 2
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; CHECK: mov r1, 7
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; CHECK: stb -6(r10), r1
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store i8 7, i8* %3, align 1
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%4 = getelementptr inbounds %struct.routing_key_2, %struct.routing_key_2* %key, i64 0, i32 0, i64 3
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; CHECK: mov r1, 8
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; CHECK: stb -5(r10), r1
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store i8 8, i8* %4, align 1
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%5 = getelementptr inbounds %struct.routing_key_2, %struct.routing_key_2* %key, i64 0, i32 0, i64 4
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; CHECK: mov r1, 9
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; CHECK: stb -4(r10), r1
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store i8 9, i8* %5, align 1
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%6 = getelementptr inbounds %struct.routing_key_2, %struct.routing_key_2* %key, i64 0, i32 0, i64 5
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; CHECK: mov r1, 10
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; CHECK: stb -3(r10), r1
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store i8 10, i8* %6, align 1
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%7 = getelementptr inbounds %struct.routing_key_2, %struct.routing_key_2* %key, i64 1, i32 0, i64 0
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; CHECK: mov r1, r10
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; CHECK: addi r1, -2
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; CHECK: mov r2, 0
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; CHECK: sth 6(r1), r2
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; CHECK: sth 4(r1), r2
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; CHECK: sth 2(r1), r2
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; CHECK: sth 24(r10), r2
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; CHECK: sth 22(r10), r2
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; CHECK: sth 20(r10), r2
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; CHECK: sth 18(r10), r2
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; CHECK: sth 16(r10), r2
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; CHECK: sth 14(r10), r2
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; CHECK: sth 12(r10), r2
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; CHECK: sth 10(r10), r2
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; CHECK: sth 8(r10), r2
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; CHECK: sth 6(r10), r2
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; CHECK: sth -2(r10), r2
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; CHECK: sth 26(r10), r2
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call void @llvm.memset.p0i8.i64(i8* %7, i8 0, i64 30, i32 1, i1 false)
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%8 = call i32 (%struct.bpf_map_def*, %struct.routing_key_2*, ...) bitcast (i32 (...)* @bpf_map_lookup_elem to i32 (%struct.bpf_map_def*, %struct.routing_key_2*, ...)*)(%struct.bpf_map_def* nonnull @routing, %struct.routing_key_2* nonnull %key) #3
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ret i32 undef
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}
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; Function Attrs: nounwind argmemonly
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declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) #1
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declare i32 @bpf_map_lookup_elem(...) #2
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