Chris Lattner
e538db4fb0
fix PR6193, only considering sign extensions *from i1* for this
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xform.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95642 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-09 01:12:41 +00:00
Chris Lattner
74529826a7
fix logical-select to invoke filecheck right, and fix hte instcombine
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xform it is checking to actually pass. There is no need to match
m_SelectCst<0, -1> since instcombine canonicalizes that into not(sext).
Add matches for sext(not(x)) in addition to not(sext(x)).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95420 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-05 19:53:02 +00:00
Chris Lattner
39ceb471b7
don't turn (A & (C0?-1:0)) | (B & ~(C0?-1:0)) -> C0 ? A : B
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for vectors. Codegen is generating awful code or segfaulting
in various cases (e.g. PR6204).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95058 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-02 02:43:51 +00:00
Chris Lattner
abb992d6a3
change the canonical form of "cond ? -1 : 0" to be
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"sext cond" instead of a select. This simplifies some instcombine
code, matches the policy for zext (cond ? 1 : 0 -> zext), and allows
us to generate better code for a testcase on ppc.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94339 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-24 00:09:49 +00:00
Chris Lattner
c0404b3715
optimize ~(~X >>s Y) --> (X >>s Y), patch by Edmund Grimley
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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
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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
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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
