[PATCH] [Tablegen] Fix alias instruction printer mangling opcodes with optional suffixes.

[Matthew Wahab]

> From: hfinkel at anl.gov [mailto:hfinkel at anl.gov]
> Sent: 23 December 2014 23:27
>
> ================
> Comment at: utils/TableGen/AsmWriterEmitter.cpp:1029
> @@ -1026,2 +1028,3 @@
>    O << "          printOperand(MI, unsigned(AsmString[I++]) - 1, OS);\n";
> -  O << "      } else {\n";
> +  O << "      } else if (NeedOpcodeSep &&\n";
> +  O << "                 (AsmString[I] == ' ' || AsmString[I] == '\t'))
> {\n";
> ----------------
> So the general idea here is that we always eat the first ' ' or '\t' and
> replace it with a '\t'. All other whitespace (including that in between
> operands) passes through as provided. Is that right?

That's right. The current printer puts a tab between the opcode and the first operand. This needs to be suppressed until after those operands which are not separated from the opcode. Whitespace after the first separator will appear as is.

> http://reviews.llvm.org/D6530
>
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