------- Comment #4 from pinskia at gcc dot gnu dot org 2006-10-05 04:38 -------
Actually the reason why it uses cvttsd2si is two fold, first cvttsd2si does not
need to act on a SSE register which is where the argument is passed in.
In fact we use cvttsd2si for 32bit also which actually simplifies the code a
lot.
Compare:
convert:
cvttsd2si 4(%esp), %eax
ret
To:
convert:
subl $8, %esp
fnstcw 6(%esp)
fldl 12(%esp)
movzwl 6(%esp), %eax
movb $12, %ah
movw %ax, 4(%esp)
fldcw 4(%esp)
fistpl (%esp)
fldcw 6(%esp)
movl (%esp), %eax
addl $8, %esp
ret
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29337
