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4919477f39
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14 Commits

Author SHA1 Message Date
Chris Lattner
4919477f39 Teach live intervals to not crash on dead livein regs 
llvm-svn: 23206
 2005-09-02 00:20:32 +00:00
Chris Lattner
ea2e61b83a 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
d50c86f078 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
bb425800f5 * 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
a5edc58139 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
3bfc6999f2 Use newly added API in MRegisterInfo. 
llvm-svn: 16060
 2004-08-26 22:22:38 +00:00
Alkis Evlogimenos
4084c50fad Clean up whitespace. 
llvm-svn: 15490
 2004-08-04 09:46:56 +00:00
Alkis Evlogimenos
db3b503b6f Convert indentation to 2 spaces. 
llvm-svn: 15489
 2004-08-04 09:46:26 +00:00
Alkis Evlogimenos
0618429149 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
c71a9684f8 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
5ff4567405 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
f60cf84fc5 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
b05751f2c7 Speedup debug builds a bit 
llvm-svn: 15137
 2004-07-23 18:38:52 +00:00
Chris Lattner
a1bce98d7f Rename LiveIntervals.(cpp|h) -> LiveIntervalAnalysis.(cpp|h) 
llvm-svn: 15135
 2004-07-23 17:56:30 +00:00