Duncan Sands d462ba8539 Teach LegalizeTypes how to expand and promote CTLZ, ... CTTZ and CTPOP. The expansion code differs from that in LegalizeDAG in that it chooses to take the CTLZ/CTTZ count from the Hi/Lo part depending on whether the Hi/Lo value is zero, not on whether CTLZ/CTTZ of Hi/Lo returned 32 (or whatever the width of the type is) for it. I made this change because the optimizers may well know that Hi/Lo is zero and exploit it. The promotion code for CTTZ also differs from that in LegalizeDAG: it uses an "or" to get the right result when the original value is zero, rather than using a compare and select. This also means the value doesn't need to be zero extended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47075 91177308-0d34-0410-b5e6-96231b3b80d8		2008-02-13 18:01:53 +00:00
..
Alpha	xfail a test	2007-11-28 05:37:13 +00:00
ARM	It's PR1925, not PR1609.	2008-02-06 22:07:17 +00:00
CBackend	CBackend: Implement unaligned load/store.	2008-02-01 21:25:59 +00:00
CellSPU	Overhaul Cell SPU's addressing mode internals so that there are now	2008-01-29 02:16:57 +00:00
Generic	Teach LegalizeTypes how to expand and promote CTLZ,	2008-02-13 18:01:53 +00:00
IA64
PowerPC	Add testcase for recent legalizer change	2008-02-13 06:48:40 +00:00
SPARC
X86	In SDISel, for targets that support FORMAL_ARGUMENTS nodes, lower this	2008-02-13 07:39:09 +00:00