a call.  This fixes Prolangs-C++/deriv2, kimwitu++, and Misc-C++/bigfib
on X86 with -enable-x86-fastcc.

llvm-svn: 22023

This fixes fourinarow with -enable-x86-fastcc.

llvm-svn: 22022

to do ugly hackery to avoid emitting code like this:

   call foo
   mov vreg, EAX
   adjcallstackup ...

If foo is a fastcc call and if vreg gets spilled, we might end up with this:

   call foo
   mov [ESP+offset], EAX     ;; Offset doesn't consider the 12!
   sub ESP, 12

Which is bad.  The previous hacky code to deal with this was A) gross B) not
good enough.  In particular, it could miss cases and emit the bad code above.
Now we always emit this:

   call foo
   adjcallstackup ...
   mov vreg, EAX

directly.

This makes fastcc with callees poping the stack work much better.  Next
stop (finally!) really is tail calls.

llvm-svn: 22021

llvm-svn: 22020

codepath

llvm-svn: 22019

llvm-svn: 22018

llvm-svn: 22017

llvm-svn: 22016

llvm-svn: 22015

special case hacks.

llvm-svn: 22014

llvm-svn: 22013

This should fix some missing symbols problems on BSD and improve performance
of programs that use that operation.

llvm-svn: 22012

llvm-svn: 22011

llvm-svn: 22010

llvm-svn: 22009

llvm-svn: 22008

llvm-svn: 22007

llvm-svn: 22006

llvm-svn: 22005

llvm-svn: 22004

llvm-svn: 22003

llvm-svn: 22002

llvm-svn: 22001

llvm-svn: 22000

llvm-svn: 21999

llvm-svn: 21998

llvm-svn: 21997

used to support things like volatile load/store, tail calls, and calling
conventions without reserving space for the additional information.

llvm-svn: 21996

is always 8-byte aligned for fastcc

llvm-svn: 21995

llvm-svn: 21994

llvm-svn: 21993

llvm-svn: 21992

llvm-svn: 21991

llvm-svn: 21990

llvm-svn: 21989

llvm-svn: 21988

llvm-svn: 21987

llvm-svn: 21986

llvm-svn: 21985

do not use

llvm-svn: 21984