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Re: PowerPC code generation
- To: Geoff Keating <geoffk at cygnus dot com>
- Subject: Re: PowerPC code generation
- From: David Edelsohn <dje at watson dot ibm dot com>
- Date: Wed, 05 Jul 2000 22:54:05 -0400
- cc: Franz dot Sirl-kernel at lauterbach dot com, dxs at pt dot com, gcc at gcc dot gnu dot org
About five years ago, I looked into adding patterns so that
combine would recognize bit-reversal shifts and ORs to use the PowerPC
byte reversal instruction. It requires a large number of intermediate,
valid patterns so that GCC combine pass eventually will combine enough of
the pieces so that it discovers the byte-reversal instruction.
David