derek.holloway
7502bf64a4
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92 lines
2.8 KiB
LLVM
92 lines
2.8 KiB
LLVM
; Checks generated using command:
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; llvm/utils/update_test_body.py llvm/test/CodeGen/BPF/jump_table_blockaddr.ll
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; RUN: rm -rf %t && split-file %s %t && cd %t
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; RUN: llc -march=bpf -mcpu=v4 < test.ll | FileCheck %s
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;
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; Source code:
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; int bar(int a) {
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; __label__ l1, l2;
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; void * volatile tgt;
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; int ret = 0;
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; if (a)
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; tgt = &&l1; // synthetic jump table generated here
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; else
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; tgt = &&l2; // another synthetic jump table
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; goto *tgt;
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; l1: ret += 1;
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; l2: ret += 2;
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; return ret;
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; }
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;
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; Compilation Flags:
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; clang --target=bpf -mcpu=v4 -O2 -emit-llvm -S test.c
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.ifdef GEN
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;--- test.ll
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define dso_local range(i32 2, 4) i32 @bar(i32 noundef %a) local_unnamed_addr{
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entry:
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%tgt = alloca ptr, align 8
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%tobool.not = icmp eq i32 %a, 0
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%. = select i1 %tobool.not, ptr blockaddress(@bar, %l2), ptr blockaddress(@bar, %l1)
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store volatile ptr %., ptr %tgt, align 8
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%tgt.0.tgt.0.tgt.0.tgt.0. = load volatile ptr, ptr %tgt, align 8
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indirectbr ptr %tgt.0.tgt.0.tgt.0.tgt.0., [label %l1, label %l2]
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l1: ; preds = %entry
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br label %l2
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l2: ; preds = %l1, %entry
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%ret.0 = phi i32 [ 3, %l1 ], [ 2, %entry ]
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ret i32 %ret.0
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}
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;--- gen
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echo ""
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echo "; Generated checks follow"
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echo ";"
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llc -march=bpf -mcpu=v4 < test.ll \
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| awk '/# -- End function/ {p=0} /@function/ {p=1} p {print "; CHECK" ": " $0}'
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.endif
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; Generated checks follow
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;
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; CHECK: .type bar,@function
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; CHECK: bar: # @bar
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; CHECK: .Lbar$local:
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; CHECK: .type .Lbar$local,@function
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; CHECK: .cfi_startproc
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; CHECK: # %bb.0: # %entry
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; CHECK: r2 = BPF.JT.0.0 ll
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; CHECK: r2 = *(u64 *)(r2 + 0)
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; CHECK: r3 = BPF.JT.0.1 ll
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; CHECK: r3 = *(u64 *)(r3 + 0)
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; CHECK: if w1 == 0 goto .LBB0_2
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; CHECK: # %bb.1: # %entry
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; CHECK: r3 = r2
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; CHECK: .LBB0_2: # %entry
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; CHECK: *(u64 *)(r10 - 8) = r3
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; CHECK: r1 = *(u64 *)(r10 - 8)
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; CHECK: gotox r1
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; CHECK: .Ltmp0: # Block address taken
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; CHECK: .LBB0_3: # %l1
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; CHECK: w0 = 3
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; CHECK: goto .LBB0_5
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; CHECK: .Ltmp1: # Block address taken
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; CHECK: .LBB0_4: # %l2
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; CHECK: w0 = 2
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; CHECK: .LBB0_5: # %.split
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; CHECK: exit
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; CHECK: .Lfunc_end0:
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; CHECK: .size bar, .Lfunc_end0-bar
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; CHECK: .size .Lbar$local, .Lfunc_end0-bar
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; CHECK: .cfi_endproc
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; CHECK: .section .jumptables,"",@progbits
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; CHECK: BPF.JT.0.0:
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; CHECK: .quad .LBB0_3-.text
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; CHECK: .size BPF.JT.0.0, 8
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; CHECK: BPF.JT.0.1:
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; CHECK: .quad .LBB0_4-.text
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; CHECK: .size BPF.JT.0.1, 8
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