On 01/13/2016 09:01 AM, David Kang wrote:
Hello,
The hardware I'm porting gcc onto has floating multiply-add instructions.
I'm trying to make gcc to generate the multiply-add instructions but it doesn't.
I described the instruction in the .md file as follows:
A floating point multiply-add is generally going to be created by
combining a floating point multiply and a floating point add in the
combine.c pass.
Expanders are only used when they're explicitly called by name -- there
is very little, if any support for generating multiply-add instructions
prior to the combine phase in GCC.
Jeff
