llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-12 03:32:10 +00:00

History

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

Analysis

Fix Transforms/LoopStrengthReduce/2005-08-15-AddRecIV.ll

2005-08-16 00:37:01 +00:00