Commit Graph

19 Commits

Author SHA1 Message Date
Dan Gohman 31ae586c74 Move per-function state out of TargetLowering subclasses and into
MachineFunctionInfo subclasses.

llvm-svn: 101634
2010-04-17 14:41:14 +00:00
Jim Grosbach 4dac890600 Fix PR6696 and PR6663
When a frame pointer is not otherwise required, and dynamic stack alignment
is necessary solely due to the spilling of a register with larger alignment
requirements than the default stack alignment, the frame pointer can be both
used as a general purpose register and a frame pointer. That goes poorly, for
obvious reasons. This patch brings back a bit of old logic for identifying
the use of such registers and conservatively reserves the frame pointer
during register allocation in such cases.

For now, implement for X86 only since it's 32-bit linux which is hitting this,
and we want a targeted fix for 2.7. As a follow-on, this will be expanded
to handle other targets, as theoretically the problem could arise elsewhere
as well.

llvm-svn: 100559
2010-04-06 20:26:37 +00:00
Anton Korobeynikov c9276dfe04 Cleanup stdcall / fastcall name mangling.
This should fix alot of problems we saw so far, e.g. PRs 5851 & 2936

llvm-svn: 95980
2010-02-12 15:28:40 +00:00
Evan Cheng d064aefefc Do not emit callseq instructions around sibcalls. This eliminated some unnecessary stack adjustments.
llvm-svn: 95475
2010-02-06 03:28:46 +00:00
Dan Gohman d185a7a629 Add explicit keywords.
llvm-svn: 72969
2009-06-05 23:05:51 +00:00
Dan Gohman 6f873b446a Fix X86MachineFunctionInfo's doxygen comment.
llvm-svn: 69127
2009-04-15 01:20:18 +00:00
Dan Gohman 0d1e9a8e04 Switch the MachineOperand accessors back to the short names like
isReg, etc., from isRegister, etc.

llvm-svn: 57006
2008-10-03 15:45:36 +00:00
Dan Gohman 6ebe734ca6 Move the GlobalBaseReg field out of X86ISelDAGToDAG.cpp
and X86FastISel.cpp into X86MachineFunction.h, so that it
can be shared, instead of having each selector keep track
of its own.

llvm-svn: 56825
2008-09-30 00:58:23 +00:00
Dan Gohman f166d2d0d6 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 f55b7381af 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 f3ebc3f3d2 Remove attribution from file headers, per discussion on llvmdev.
llvm-svn: 45418
2007-12-29 20:36:04 +00:00
Arnold Schwaighofer 9ccea99165 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 597c8b77e4 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 9ae2eb43d8 Use push / pop for prologues and epilogues.
llvm-svn: 39967
2007-07-17 07:59:08 +00:00
Chris Lattner ff0598de75 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 104aa5dbc1 Various random and minor code cleanups.
llvm-svn: 30608
2006-09-26 03:57:53 +00:00
Anton Korobeynikov 3c5b3df6a0 Adding codegeneration for StdCall & FastCall calling conventions
llvm-svn: 30549
2006-09-20 22:03:51 +00:00
Evan Cheng beedf824e3 Comments to appease sabre.
llvm-svn: 28737
2006-06-09 06:25:10 +00:00
Evan Cheng dc614c193e 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