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13 Commits

Author SHA1 Message Date
Chris Lattner 76aa8e071b Allow the live interval analysis pass to be a bit more aggressive about 
numbering values in live ranges for physical registers.

The alpha backend currently generates code that looks like this:

  vreg = preg
...
  preg = vreg
  use preg
...
  preg = vreg
  use preg

etc.  Because vreg contains the value of preg coming in, each of the
copies back into preg contain that initial value as well.

In the case of the Alpha, this allows this testcase:

void "foo"(int %blah) {
        store int 5, int *%MyVar
        store int 12, int* %MyVar2
        ret void
}

to compile to:

foo:
        ldgp $29, 0($27)
        ldiq $0,5
        stl $0,MyVar
        ldiq $0,12
        stl $0,MyVar2
        ret $31,($26),1

instead of:

foo:
        ldgp $29, 0($27)
        bis $29,$29,$0
        ldiq $1,5
        bis $0,$0,$29
        stl $1,MyVar
        ldiq $1,12
        bis $0,$0,$29
        stl $1,MyVar2
        ret $31,($26),1

This does not seem to have any noticable effect on X86 code.

This fixes PR535.

llvm-svn: 20536
 2005-03-09 23:05:19 +00:00
Reid Spencer 9083936835 For PR387:\ 
Make only one print method to avoid overloaded virtual warnings when \
compiled with -Woverloaded-virtual

llvm-svn: 18589
 2004-12-07 04:03:45 +00:00
Chris Lattner b0b707fc75 * Wrap some comments to 80 cols 
* Add const_iterator stuff
* Add a print method, which means that I can now call dump() from the
  debugger.

llvm-svn: 16612
 2004-09-30 15:59:17 +00:00
Alkis Evlogimenos adb2ce2962 Use a DenseMap for mapping reg->reg. This improves the LiveInterval 
analysis running time from 2.7869secs to 2.5226secs on 176.gcc.

llvm-svn: 16244
 2004-09-08 03:01:50 +00:00
Alkis Evlogimenos 542ac1cba7 Use newly added API in MRegisterInfo. 
llvm-svn: 16060
 2004-08-26 22:22:38 +00:00
Alkis Evlogimenos 4242241a69 Clean up whitespace. 
llvm-svn: 15490
 2004-08-04 09:46:56 +00:00
Alkis Evlogimenos a698308cce Convert indentation to 2 spaces. 
llvm-svn: 15489
 2004-08-04 09:46:26 +00:00
Alkis Evlogimenos cf72e7f854 Change std::map<unsigned, LiveInterval*> into a std::map<unsigned, 
LiveInterval>. This saves some space and removes the pointer
indirection caused by following the pointer.

llvm-svn: 15167
 2004-07-24 11:44:15 +00:00
Chris Lattner c51866a20e Completely eliminate the intervals_ list. instead, the r2iMap_ maintains 
ownership of the intervals.

llvm-svn: 15155
 2004-07-24 03:32:06 +00:00
Chris Lattner d7b9e29327 Add a new differingRegisterClasses method 
make overlapsAliases take pointers instead of references
fix indentation

llvm-svn: 15153
 2004-07-24 02:53:43 +00:00
Chris Lattner 1604b02c4c More minor changes: 
* Inline some functions
 * Eliminate some comparisons from the release build

This is good for another .3 on gcc.

llvm-svn: 15144
 2004-07-23 21:24:19 +00:00
Chris Lattner 848c7c59d4 Speedup debug builds a bit 
llvm-svn: 15137
 2004-07-23 18:38:52 +00:00
Chris Lattner 856383326a Rename LiveIntervals.(cpp|h) -> LiveIntervalAnalysis.(cpp|h) 
llvm-svn: 15135
 2004-07-23 17:56:30 +00:00