llvm/test/CodeGen
Bill Wendling 36ae6c1827 The DAG combiner was performing a BT combine. The BT combine had a value of -1,
so it changed it into a 31 via the TLO.ShrinkDemandedConstant() call. Then it
would go through the DAG combiner again. This time it had a value of 31, which
was turned into a -1 by TLI.SimplifyDemandedBits(). This would ping pong
forever.

Teach the TLO.ShrinkDemandedConstant() call not to lower a value if the demanded
value is an XOR of all ones.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65985 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-04 00:18:06 +00:00
..
Alpha Fix Alpha test and support for private linkage. 2009-01-15 21:51:46 +00:00
ARM Last commit accidentially deleted this code. 2009-02-28 06:02:14 +00:00
CBackend Fix PR2907 by digging through constant expressions to find FP constants that 2008-10-22 04:53:16 +00:00
CellSPU Used "-enable-unsafe-fp-math" to allow this transformation - (a * b -c) = c - a *b. 2009-01-31 06:50:54 +00:00
CPP
Generic bug 3610: Test case. 2009-02-22 15:54:44 +00:00
IA64 Add the private linkage. 2009-01-15 20:18:42 +00:00
Mips Add the private linkage. 2009-01-15 20:18:42 +00:00
PowerPC Private linkage support for PPC / Darwin. 2009-01-25 06:32:01 +00:00
SPARC Add the private linkage. 2009-01-15 20:18:42 +00:00
X86 The DAG combiner was performing a BT combine. The BT combine had a value of -1, 2009-03-04 00:18:06 +00:00
XCore Add the private linkage. 2009-01-15 20:18:42 +00:00