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15 Commits

Author SHA1 Message Date
Benjamin Kramer
aeff9e581b X86: Add an SSE2 lowering for 64 bit compares when pcmpgtq (SSE4.2) isn't available. 
This pattern started popping up in vectorized min/max reductions.

llvm-svn: 179797
 2013-04-18 21:37:45 +00:00
Benjamin Kramer
e4eabce005 X86: Shave off one shuffle from the pcmpeqq sequence for SSE2 by making use of and commutativity. 
llvm-svn: 171064
 2012-12-25 13:09:08 +00:00
Benjamin Kramer
2e313ba01d X86: Custom lower <2 x i64> eq and ne when SSE41 is not available. 
pcmpeqd, pshufd, pshufd, pand is cheaper than unpack + cmpq, sbbq, cmpq, sbbq + pack.
Small speedup on loop-vectorized viterbi (-march=core2).

llvm-svn: 171063
 2012-12-25 12:54:19 +00:00
Manman Ren
2c236a30f6 X86 Peephole: fold loads to the source register operand if possible. 
Add more comments and use early returns to reduce nesting in isLoadFoldable.
Also disable folding for V_SET0 to avoid introducing a const pool entry and
a const pool load.

rdar://10554090 and rdar://11873276

llvm-svn: 161207
 2012-08-02 19:37:32 +00:00
Manman Ren
78b8d454cc X86 Peephole: fold loads to the source register operand if possible. 
Machine CSE and other optimizations can remove instructions so folding
is possible at peephole while not possible at ISel.

This patch is a rework of r160919 and was tested on clang self-host on my local
machine.

rdar://10554090 and rdar://11873276

llvm-svn: 161152
 2012-08-02 00:56:42 +00:00
Manman Ren
ceef7c4d9b Revert r160920 and r160919 due to dragonegg and clang selfhost failure 
llvm-svn: 160927
 2012-07-29 02:44:09 +00:00
Manman Ren
9494d0a2c2 X86 Peephole: fold loads to the source register operand if possible. 
Trying to fix the bot by specifying a triple in the failing testing cases.

llvm-svn: 160920
 2012-07-28 17:51:24 +00:00
Manman Ren
ea77f9076b X86 Peephole: fold loads to the source register operand if possible. 
Machine CSE and other optimizations can remove instructions so folding
is possible at peephole while not possible at ISel.

rdar://10554090 and rdar://11873276

llvm-svn: 160919
 2012-07-28 16:48:01 +00:00
Jakob Stoklund Olesen
a027a6d4f2 Enable -sse-domain-fix by default. Now with tests! 
llvm-svn: 99954
 2010-03-30 22:47:00 +00:00
Dan Gohman
df2896d609 Eliminate more uses of llvm-as and llvm-dis. 
llvm-svn: 81290
 2009-09-08 23:54:48 +00:00
Chris Lattner
1eeea0d262 add some more check for vector compares. 
llvm-svn: 75024
 2009-07-08 18:51:25 +00:00
Chris Lattner
c153b998d9 eliminate the v[if]cmp versions of these tests, now that [if]cmp+sext works. 
llvm-svn: 74980
 2009-07-08 00:49:35 +00:00
Chris Lattner
ea7bd9b484 dag combine sext(setcc) -> vsetcc before legalize. To make this safe, 
VSETCC must define all bits, which is different than it was documented
to before.  Since all targets that implement VSETCC already have this
behavior, and we don't optimize based on this, just change the 
documentation.  We now get nice code for vec_compare.ll

llvm-svn: 74978
 2009-07-08 00:31:33 +00:00
Chris Lattner
e2435c4f6f add support for legalizing an icmp where the result is illegal (4xi1) but 
the input is legal (4 x i32)

llvm-svn: 74964
 2009-07-07 23:03:54 +00:00
Chris Lattner
1de1b3155b add a trivial test that vector compares work. 
llvm-svn: 74963
 2009-07-07 22:51:09 +00:00