On Mon, May 7, 2012 at 3:02 PM, Steven Bosscher <stevenb....@gmail.com> wrote: > Hi, > > I noticed gcc predicts huge sizes for asm statements on ix86. This is > due to define_asm_attributes in i386.md, where the length *per single > instruction* in the asm is set to 128. That doesn't look realistic to > me. Is there a good reason for this large value? Or should something > like the patch below be tested? (I choose 16 but I don't know if there > are larger insns for x86 - I assume you do ;-) > > Ciao! > Steven > > > Index: config/i386/i386.md > =================================================================== > --- config/i386/i386.md (revision 187257) > +++ config/i386/i386.md (working copy) > @@ -661,7 +661,7 @@ > > ;; Describe a user's asm statement. > (define_asm_attributes > - [(set_attr "length" "128") > + [(set_attr "length" "16") > (set_attr "type" "multi")]) > > (define_code_iterator plusminus [plus minus])
I checked with our people. The maximum insn length on Intel processor is 15byte. -- H.J.
