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3 Commits

Author SHA1 Message Date
Chris Lattner
c0404b3715 optimize ~(~X >>s Y) --> (X >>s Y), patch by Edmund Grimley 
Evans!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93884 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-19 18:16:19 +00:00
Chris Lattner
8e76764de8 add one more bitfield optimization, allowing clang to generate 
good code on PR4216:

_test_bitfield:                                             ## @test_bitfield
	orl	$32962, %edi
	movl	$4294941946, %eax
	andq	%rdi, %rax
	ret

instead of:

_test_bitfield:
        movl    $4294941696, %ecx
        movl    %edi, %eax
        orl     $194, %edi
        orl     $32768, %eax
        andq    $250, %rdi
        andq    %rax, %rcx
        movq    %rdi, %rax
        orq     %rcx, %rax
        ret

Evan is looking into the remaining andq+imm -> andl optimization.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93147 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-11 06:55:24 +00:00
Chris Lattner
25f2a23b4a split and/or/xor out into one overly-large (2000LOC) file. However, I think 
it does make sense to keep them together, at least for now.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92711 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-05 07:50:36 +00:00