On Sat, Jan 27, 2007 at 11:13:28PM +0530, BHASKAR G. REDDY wrote: > > Hi, > Is there any way to know, how a pattern in MD file is matched while > generating code? The program build/genrecog.c is compiled and run, generating insn-recog.c which contains a decision tree to match RTL against the instruction patterns in the machine description. > But there are numerous other patterns in this md file which also > generates and instruction when matched against RTL template. It is quite normal since "andl" also sets the condition codes. This alone makes for three patterns to output an "andl" instruction: One to describe what happens to the destination operand, one to describe how the condition codes are set and one to describe both of the above at the same time. Additionally, "andl" may be used for clearing bit-fields. -- Rask Ingemann Lambertsen
