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constant materialization could be improved.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92921 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-01-07 17:53:10 +00:00
parent 3d594fd299
commit ddac706747
1 changed files with 33 additions and 0 deletions
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33
lib/Target/PowerPC/README.txt
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@ -5,6 +5,39 @@ TODO:
* implement do-loop -> bdnz transform
* lmw/stmw pass a la arm load store optimizer for prolog/epilog
===-------------------------------------------------------------------------===
On PPC64, this:
long f2 (long x) { return 0xfffffff000000000UL; }
long f3 (long x) { return 0x1ffffffffUL; }
could compile into:
_f2:
li r3,-1
rldicr r3,r3,0,27
blr
_f3:
li r3,-1
rldicl r3,r3,0,31
blr
we produce:
_f2:
lis r2, 4095
ori r2, r2, 65535
sldi r3, r2, 36
blr
_f3:
li r2, 1
sldi r2, r2, 32
oris r2, r2, 65535
ori r3, r2, 65535
blr
===-------------------------------------------------------------------------===
Support 'update' load/store instructions. These are cracked on the G5, but are