[LLVMdev] where is F7 opcode for TEST instruction on X86?
Jun Koi
junkoi2004 at gmail.com
Wed Apr 23 20:25:26 PDT 2014
On Tue, Apr 22, 2014 at 11:39 PM, Craig Topper <craig.topper at gmail.com>wrote:
> If memory serves the Xi16, Xi32, and Xi64 types cause some magic inside of
> BinOpMI_F(or classes it inherits from) to OR a 1 into the LSB of the opcode.
>
>
Thanks a lot, Craig!
>
> On Tue, Apr 22, 2014 at 6:45 AM, Jun Koi <junkoi2004 at gmail.com> wrote:
>
>> hi,
>>
>> at the moment, TEST instruction is defined with 0xf7 opcode, as
>> demonstrated below.
>>
>> $ echo "0xf7 0xc0 0x00 0x00 0x00 0x22"|./Release+Asserts/bin/llvm-mc
>> -disassemble -arch=x86
>> .section __TEXT,__text,regular,pure_instructions
>> testl $570425344, %eax ## imm = 0x22000000
>>
>> however, i cannot find anywhere this F7 opcode is defined in
>> lib/Target/X86/X86InstrArithmetic.td.
>> we only have TEST defined with F6 & other opcode like below.
>>
>> any hint please?
>>
>> thanks.
>>
>>
>> let isCompare = 1 in {
>> let Defs = [EFLAGS] in {
>> let isCommutable = 1 in {
>> def TEST8rr : BinOpRR_F<0x84, "test", Xi8 , X86testpat, MRMSrcReg>;
>> def TEST16rr : BinOpRR_F<0x84, "test", Xi16, X86testpat, MRMSrcReg>;
>> def TEST32rr : BinOpRR_F<0x84, "test", Xi32, X86testpat, MRMSrcReg>;
>> def TEST64rr : BinOpRR_F<0x84, "test", Xi64, X86testpat, MRMSrcReg>;
>> } // isCommutable
>>
>> def TEST8rm : BinOpRM_F<0x84, "test", Xi8 , X86testpat>;
>> def TEST16rm : BinOpRM_F<0x84, "test", Xi16, X86testpat>;
>> def TEST32rm : BinOpRM_F<0x84, "test", Xi32, X86testpat>;
>> def TEST64rm : BinOpRM_F<0x84, "test", Xi64, X86testpat>;
>>
>> def TEST8ri : BinOpRI_F<0xF6, "test", Xi8 , X86testpat, MRM0r>;
>> def TEST16ri : BinOpRI_F<0xF6, "test", Xi16, X86testpat, MRM0r>;
>> def TEST32ri : BinOpRI_F<0xF6, "test", Xi32, X86testpat, MRM0r>;
>> def TEST64ri32 : BinOpRI_F<0xF6, "test", Xi64, X86testpat, MRM0r>;
>>
>> def TEST8mi : BinOpMI_F<"test", Xi8 , X86testpat, MRM0m, 0xF6>;
>> def TEST16mi : BinOpMI_F<"test", Xi16, X86testpat, MRM0m, 0xF6>;
>> def TEST32mi : BinOpMI_F<"test", Xi32, X86testpat, MRM0m, 0xF6>;
>> def TEST64mi32 : BinOpMI_F<"test", Xi64, X86testpat, MRM0m, 0xF6>;
>>
>> // When testing the result of EXTRACT_SUBREG sub_8bit_hi, make sure
>> the
>> // register class is constrained to GR8_NOREX.
>> let isPseudo = 1 in
>> def TEST8ri_NOREX : I<0, Pseudo, (outs), (ins GR8_NOREX:$src,
>> i8imm:$mask),
>> "", [], IIC_BIN_NONMEM>, Sched<[WriteALU]>;
>> } // Defs = [EFLAGS]
>>
>> def TEST8i8 : BinOpAI<0xA8, "test", Xi8 , AL,
>> "{$src, %al|al, $src}">;
>> def TEST16i16 : BinOpAI<0xA8, "test", Xi16, AX,
>> "{$src, %ax|ax, $src}">;
>> def TEST32i32 : BinOpAI<0xA8, "test", Xi32, EAX,
>> "{$src, %eax|eax, $src}">;
>> def TEST64i32 : BinOpAI<0xA8, "test", Xi64, RAX,
>> "{$src, %rax|rax, $src}">;
>> } // isCompare
>>
>>
>>
>> _______________________________________________
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>> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu
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>>
>>
>
>
> --
> ~Craig
>
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