Chris Lattner 1d6373c1af teach selection dag mask tracking about the fact that select_cc operates like ... select. Also teach it that the bit count instructions can only set the low bits of the result, depending on the size of the input. This allows us to compile this: int %eq0(int %a) { %tmp.1 = seteq int %a, 0 ; <bool> [#uses=1] %tmp.2 = cast bool %tmp.1 to int ; <int> [#uses=1] ret int %tmp.2 } To this: _eq0: cntlzw r2, r3 srwi r3, r2, 5 blr instead of this: _eq0: cntlzw r2, r3 rlwinm r3, r2, 27, 31, 31 blr when setcc is marked illegal on ppc (which restores parity to non-illegal setcc). Thanks to Nate for pointing this out. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23013 91177308-0d34-0410-b5e6-96231b3b80d8		2005-08-24 16:46:55 +00:00
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CodeGen	teach selection dag mask tracking about the fact that select_cc operates like	2005-08-24 16:46:55 +00:00
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System	For PR616:	2005-08-24 10:07:20 +00:00
Target	Whoops, fix a thinko. All cases except SETNE are now handled by the	2005-08-24 05:06:48 +00:00
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