> Second, like rs6000 the sparc negate fused multiply instructions > negate the full result, not the multiply result. So we cannot use > those instructions for the fnmadf4/fnmsdf4/fnmasf4/fnmssf4 patterns. > Since rs6000 provides patterns for such negate operations (presumably > just in case the combiner creates a match) I have done so for sparc > as well.
OK, this makes sense indeed. > For now my plan is to turn these fused multiply instructions on if you > ask to compile targetting a cpu that supports them. > I'll write a suitable changelog etc. once everything is finalized, this > patch posting is just to elicit feedback. What's the story with TFmode for FMA? Thanks for working on this! -- Eric Botcazou
