[LLVMdev] Botched Build

Chris Lattner clattner at apple.com
Mon Feb 15 13:08:22 PST 2010

On Feb 15, 2010, at 1:04 PM, David Greene wrote:
>> FWIW, this is because you broke the encoding of an instruction in your
>> patch.  This is incorrect:
>> +def MOVNTDQ_64mr : PSI<0xE7, MRMDestMem, (outs), (ins f128mem:$dst,
>> VR128:$src), +                    "movntdq\t{$src, $dst|$dst, $src}",
>> +                    [(alignednontemporalstore (v2f64 VR128:$src),
>> addr:$dst)]>;
>> Please don't check in patches when you know that they break testcases.
> I certainly didn't know it broke anything.  I even checked the buildbot and it 
> looked like it failed before I ever applied anything.  Apologies for the mix-
> up.

FYI, if you want to check the encoding of an instruction, you can do so with a command like this:

$ cat t.s
 movntdq %xmm5, 3735928559(%ebx,%ecx,8)
$ llvm-mc t.s -show-encoding -show-inst
	.section	__TEXT,__text,regular,pure_instructions
	movntdq	%xmm5, 3735928559(%ebx,%ecx,8) ## encoding: [0x66,0x0f,0xe7,0xac,0xcb,0xef,0xbe,0xad,0xde]
                                        ## <MCInst #1358 MOVNTDQmr
                                        ##   <MCOperand Reg:29>
                                        ##   <MCOperand Imm:8>
                                        ##   <MCOperand Reg:38>
                                        ##   <MCOperand Imm:3735928559>
                                        ##   <MCOperand Reg:0>
                                        ##   <MCOperand Reg:138>>

This shows that the 'MOVNTDQmr' instruction is being used along with the encoding.


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