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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34081 91177308-0d34-0410-b5e6-96231b3b80d8
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Nate Begeman 2007-02-09 04:19:54 +00:00
parent 4d9e7fe1f0
commit 8c541bcc56
1 changed files with 0 additions and 26 deletions
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26
lib/Target/PowerPC/README.txt
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@ -265,32 +265,6 @@ This could be done in the dag combiner, by swapping a BR_CC when a SETCC of the
same operands (but backwards) exists. In this case, this wouldn't save us
anything though, because the compares still wouldn't be shared.
===-------------------------------------------------------------------------===
The legalizer should lower this:
bool %test(ulong %x) {
%tmp = setlt ulong %x, 4294967296
ret bool %tmp
}
into "if x.high == 0", not:
_test:
cntlzw r2, r3
xori r3, r3, 1
cmplwi cr0, r3, 0
srwi r2, r2, 5
li r3, 0
beq cr0, LBB1_2 ;entry
LBB1_1: ;entry
mr r3, r2
LBB1_2: ;entry
blr
noticed in 2005-05-11-Popcount-ffs-fls.c.
===-------------------------------------------------------------------------===
We should custom expand setcc instead of pretending that we have it. That