On 01/18/2016 02:04 AM, Richard Earnshaw (lists) wrote:
+(define_constraint "Upl"
+ "A constraint that matches two uses of add instructions."
That's not a particularly helpful description for external users of the
compiler. I think that either needs to be sufficiently precise that
people who
> +(define_constraint "Upl"
> + "A constraint that matches two uses of add instructions."
That's not a particularly helpful description for external users of the
compiler. I think that either needs to be sufficiently precise that
people who understand the ISA but not the guts of GCC can use it,
See the PR for details, but basically, the plus operations are special so you
can't just split out one of the alternatives to a different pattern.
This merges the two-instruction add case back into the main plus pattern, and
then adds peepholes and splitters to generate the same code as before.
O
