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2012 Nov 16
1
[LLVMdev] Operand order in dag pattern matching in td files
...s needs be answered first. null_frag causes the pattern to be dropped. Now having covered that the reason the operands are in the order they are is because the only instruction that doesn't use null_frag is this one defm r213 : fma3s_rm<opc213, !strconcat(OpStr, !strconcat("213", PackTy)), x86memop, RC, OpVT, mem_frag, OpNode> Which specifies the operand order as 213 thus why they are 2, 1, 3 in the pattern. ~Craig On Fri, Nov 16, 2012 at 12:19 AM, Anitha B Gollamudi < anitha.boyapati at gmail.com> wrote: > On 16 November 2012 13:41, Anitha B G...
2012 Nov 16
0
[LLVMdev] Operand order in dag pattern matching in td files
On 16 November 2012 13:41, Anitha B Gollamudi <anitha.boyapati at gmail.com> wrote: > Hi, > > I have a simple question w.r.t the order of operands used in dag > pattern matching in target files. Some of them seem intuitive. But I > want to get it clarified anyway. I am using a pattern from > X86InstrFMA.td in the below example. Consider FMA3 pattern > (simplified). >
2012 Nov 16
2
[LLVMdev] Operand order in dag pattern matching in td files
Hi, I have a simple question w.r.t the order of operands used in dag pattern matching in target files. Some of them seem intuitive. But I want to get it clarified anyway. I am using a pattern from X86InstrFMA.td in the below example. Consider FMA3 pattern (simplified). let Constraints = "$src1 = $dst" in { multiclass fma3s_rm<bits<8> opc, string OpcodeStr, X86MemOperand