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11 Commits

Author SHA1 Message Date
Dan Gohman
93b5be1824 Implement an x86-64 ABI detail of passing structs by hidden first 
argument. The x86-64 ABI requires the incoming value of %rdi to
be copied to %rax on exit from a function that is returning a
large C struct.

Also, add a README-X86-64 entry detailing the missed optimization
opportunity and proposing an alternative approach.

llvm-svn: 50075
 2008-04-21 23:59:07 +00:00
Evan Cheng
5b9282f3b5 Combine MovePCtoStack + POP32r into one instruction MOVPC32r so it can be moved if needed. 
llvm-svn: 45605
 2008-01-05 00:41:47 +00:00
Chris Lattner
ad9a6ccb83 Remove attribution from file headers, per discussion on llvmdev. 
llvm-svn: 45418
 2007-12-29 20:36:04 +00:00
Arnold Schwaighofer
d47210011e Added tail call optimization to the x86 back end. It can be 
enabled by passing -tailcallopt to llc.  The optimization is
performed if the following conditions are satisfied:
* caller/callee are fastcc
* elf/pic is disabled OR
  elf/pic enabled + callee is in module + callee has
  visibility protected or hidden

llvm-svn: 42870
 2007-10-11 19:40:01 +00:00
Anton Korobeynikov
3094846993 Move ReturnAddrIndex variable to X86MachineFunctionInfo structure. This fixed 
hard to catch bugs with retaddr lowering

llvm-svn: 41104
 2007-08-15 17:12:32 +00:00
Evan Cheng
532b73311e Use push / pop for prologues and epilogues. 
llvm-svn: 39967
 2007-07-17 07:59:08 +00:00
Chris Lattner
c7109ece27 rename X86FunctionInfo to X86MachineFunctionInfo to match the header file 
it is defined in.

llvm-svn: 36196
 2007-04-17 17:21:52 +00:00
Chris Lattner
b826d65e01 Various random and minor code cleanups. 
llvm-svn: 30608
 2006-09-26 03:57:53 +00:00
Anton Korobeynikov
59ef7e94eb Adding codegeneration for StdCall & FastCall calling conventions 
llvm-svn: 30549
 2006-09-20 22:03:51 +00:00
Evan Cheng
9e5e585c89 Comments to appease sabre. 
llvm-svn: 28737
 2006-06-09 06:25:10 +00:00
Evan Cheng
2da9d803a4 Added X86FunctionInfo subclass of MachineFunction to record whether the 
function that is being lowered is forced to use FP. Currently this is only
true for main() / Cygwin.

llvm-svn: 28703
 2006-06-06 23:30:24 +00:00