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bd70b9a0d8
llvm-mirror/test/CodeGen/BPF
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Yonghong Song bd70b9a0d8 bpf: Tighten subregister definition check 
The current subregister definition check stops after the MOV_32_64
instruction.

This means we are thinking all the following instruction sequences
are safe to be eliminated:

  MOV_32_64 rB, wA
  SLL_ri    rB, rB, 32
  SRL_ri    rB, rB, 32

However, this is *not* true. The source subregister wA of MOV_32_64 could
come from a implicit truncation of 64-bit register in which case the high
bits of the 64-bit register is not zeroed, therefore we can't eliminate
above sequence.

For example, for i32_val, we shouldn't do the elimination:

  long long bar ();

  int foo (int b, int c)
  {
    unsigned int i32_val = (unsigned int) bar();

    if (i32_val < 10)
      return b;
    else
      return c;
  }

Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Yonghong Song <yhs@fb.com>
llvm-svn: 327365
2018-03-13 06:47:00 +00:00
..
32-bit-subreg-alu.ll bpf: New codegen testcases for 32-bit subregister support 2018-02-23 23:49:33 +00:00
32-bit-subreg-cond-select.ll bpf: New codegen testcases for 32-bit subregister support 2018-02-23 23:49:33 +00:00
32-bit-subreg-load-store.ll bpf: New codegen testcases for 32-bit subregister support 2018-02-23 23:49:33 +00:00
32-bit-subreg-peephole.ll bpf: Tighten subregister definition check 2018-03-13 06:47:00 +00:00
alu8.ll [BPF] Return true in enableMultipleCopyHints(). 2018-02-18 10:09:54 +00:00
atomics.ll [bpf] add BPF disassembler 2016-11-20 02:25:00 +00:00
basictest.ll [BPF] Return true in enableMultipleCopyHints(). 2018-02-18 10:09:54 +00:00
byval.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
cc_args_be.ll [bpf] allow direct and indirect calls 2017-11-19 01:35:00 +00:00
cc_args.ll [bpf] allow direct and indirect calls 2017-11-19 01:35:00 +00:00
cc_ret.ll [bpf] allow direct and indirect calls 2017-11-19 01:35:00 +00:00
cmp.ll [BPF] Return true in enableMultipleCopyHints(). 2018-02-18 10:09:54 +00:00
dwarfdump.ll [DebugInfo] Support DWARF v5 source code embedding extension 2018-02-23 23:01:06 +00:00
ex1.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
fi_ri.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
inline_asm.ll bpf: add inline-asm support 2017-09-18 23:29:36 +00:00
intrinsics.ll [BPF] Return true in enableMultipleCopyHints(). 2018-02-18 10:09:54 +00:00
lit.local.cfg
load.ll convert bpf assembler to look like kernel verifier output 2016-11-18 02:32:35 +00:00
loops.ll convert bpf assembler to look like kernel verifier output 2016-11-18 02:32:35 +00:00
many_args1.ll
many_args2.ll
mem_offset_be.ll bpf: add " ll" in the LD_IMM64 asmstring 2017-09-11 23:43:35 +00:00
mem_offset.ll [bpf] Fix memory offset check for loads and stores 2017-04-13 22:24:13 +00:00
objdump_atomics.ll [bpf] add BPF disassembler 2016-11-20 02:25:00 +00:00
objdump_cond_op_2.ll bpf: print backward branch target properly 2017-11-16 19:15:36 +00:00
objdump_cond_op.ll bpf: print backward branch target properly 2017-11-16 19:15:36 +00:00
objdump_imm_hex.ll bpf: add support for objdump -print-imm-hex 2017-12-20 19:39:58 +00:00
objdump_intrinsics.ll [BPF] Return true in enableMultipleCopyHints(). 2018-02-18 10:09:54 +00:00
objdump_trivial.ll [bpf] error when unknown bpf helper is called 2017-01-17 07:26:17 +00:00
reloc.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
remove_truncate_1.ll bpf: remove unnecessary truncate operation 2017-06-29 15:18:54 +00:00
remove_truncate_2.ll bpf: remove unnecessary truncate operation 2017-06-29 15:18:54 +00:00
remove_truncate_3.ll [BPF] Return true in enableMultipleCopyHints(). 2018-02-18 10:09:54 +00:00
remove_truncate_4.ll [BPF] Teach DAG2DAG AND elimination about load intrinsics 2018-01-16 07:27:19 +00:00
remove_truncate_5.ll bpf: fix a bug in dag2dag optimization for loads from readonly section 2018-02-15 17:06:45 +00:00
rodata_1.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
rodata_2.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
rodata_3.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
rodata_4.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
sanity.ll [BPF] Return true in enableMultipleCopyHints(). 2018-02-18 10:09:54 +00:00
sdiv_error.ll
select_ri.ll bpf: Improve expanding logic in LowerSELECT_CC 2018-02-08 04:37:49 +00:00
setcc.ll bpf: add variants of -mcpu=# and support for additional jmp insns 2017-08-23 04:25:57 +00:00
shifts.ll [BPF] Return true in enableMultipleCopyHints(). 2018-02-18 10:09:54 +00:00
sockex2.ll Followup on Proposal to move MIR physical register namespace to '$' sigil. 2018-01-31 22:04:26 +00:00
struct_ret1.ll
struct_ret2.ll
undef.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
vararg1.ll
warn-call.ll Remove alignment argument from memcpy/memmove/memset in favour of alignment attributes (Step 1) 2018-01-19 17:13:12 +00:00
warn-stack.ll Add address space mangling to lifetime intrinsics 2017-04-10 20:18:21 +00:00