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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25903 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2006-02-02 07:37:11 +00:00
parent 93c740bbbb
commit 275b8846d5
1 changed files with 19 additions and 0 deletions
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19
lib/Target/PowerPC/README.txt
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@ -448,3 +448,22 @@ LBB1_2:
blr
noticed in 2005-05-11-Popcount-ffs-fls.c.
===-------------------------------------------------------------------------===
We should custom expand setcc instead of pretending that we have it. That
would allow us to expose the access of the crbit after the mfcr, allowing
that access to be trivially folded into other ops. A simple example:
int foo(int a, int b) { return (a < b) << 4; }
compiles into:
_foo:
cmpw cr7, r3, r4
mfcr r2, 1
rlwinm r2, r2, 29, 31, 31
slwi r3, r2, 4
blr