Benjamin Kramer
98c95e7743
Revert r108141 again, sigh.
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llvm-svn: 108148
2010-07-12 14:42:04 +00:00
Benjamin Kramer
c4f46375d3
Reapply 108136 with an ugly pasto fixed.
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llvm-svn: 108141
2010-07-12 13:44:00 +00:00
Benjamin Kramer
d9bf737e62
Revert r108136 until I figure out why it broke selfhost.
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llvm-svn: 108139
2010-07-12 12:35:49 +00:00
Benjamin Kramer
f00a49ceff
instcombine: fold (x & y) | (~x & z) and (x & y) ^ (~x & z) into ((y ^ z) & x) ^ z which is one instruction shorter. (PR6773)
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before:
%and = and i32 %y, %x
%neg = xor i32 %x, -1
%and4 = and i32 %z, %neg
%xor = xor i32 %and4, %and
after:
%xor1 = xor i32 %z, %y
%and2 = and i32 %xor1, %x
%xor = xor i32 %and2, %z
llvm-svn: 108136
2010-07-12 11:54:45 +00:00
Bill Wendling
d1f658563d
This test case:
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long test(long x) { return (x & 123124) | 3; }
Currently compiles to:
_test:
orl $3, %edi
movq %rdi, %rax
andq $123127, %rax
ret
This is because instruction and DAG combiners canonicalize
(or (and x, C), D) -> (and (or, D), (C | D))
However, this is only profitable if (C & D) != 0. It gets in the way of the
3-addressification because the input bits are known to be zero.
llvm-svn: 97616
2010-03-03 00:35:56 +00:00
Chris Lattner
e0124f19f9
optimize ~(~X >>s Y) --> (X >>s Y), patch by Edmund Grimley
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Evans!
llvm-svn: 93884
2010-01-19 18:16:19 +00:00
Chris Lattner
b033a0ac47
teach instcombine to simplify xor's harder, catching the
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new testcase.
llvm-svn: 83799
2009-10-11 22:22:13 +00:00
Chris Lattner
c8e0cdb676
convert xor2 to filecheck, merge in a random regtest
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llvm-svn: 83796
2009-10-11 21:42:08 +00:00
Dan Gohman
205b641954
Change tests from "opt %s" to "opt < %s" so that opt doesn't see the
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input filename so that opt doesn't print the input filename in the
output so that grep lines in the tests don't unintentionally match
strings in the input filename.
llvm-svn: 81537
2009-09-11 18:01:28 +00:00
Dan Gohman
c95df8b6d8
Use opt -S instead of piping bitcode output through llvm-dis.
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llvm-svn: 81257
2009-09-08 22:34:10 +00:00
Dan Gohman
8d84372836
Change these tests to feed the assembly files to opt directly, instead
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of using llvm-as, now that opt supports this.
llvm-svn: 81226
2009-09-08 16:50:01 +00:00
Reid Spencer
c49d7dd886
For PR1319:
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Upgrade tests to work with new llvm.exp version of llvm_runtest.
llvm-svn: 36013
2007-04-14 20:13:02 +00:00
Chris Lattner
2083adbfb8
new testcase for PR1253
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llvm-svn: 35611
2007-04-03 01:45:32 +00:00
