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14 Commits

Author SHA1 Message Date
Benjamin Kramer 81b5a8fd2e 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 df4af41b9b 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 ba8122cc25 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 5759d01230 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 f87dd7c01b Revert r160920 and r160919 due to dragonegg and clang selfhost failure 
llvm-svn: 160927
 2012-07-29 02:44:09 +00:00
Manman Ren 9de95e779c 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 0fa3ab88ba 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 6f6ebb663c Enable -sse-domain-fix by default. Now with tests! 
llvm-svn: 99954
 2010-03-30 22:47:00 +00:00
Dan Gohman 40503396da Eliminate more uses of llvm-as and llvm-dis. 
llvm-svn: 81290
 2009-09-08 23:54:48 +00:00
Chris Lattner d5ffa8ffb6 add some more check for vector compares. 
llvm-svn: 75024
 2009-07-08 18:51:25 +00:00
Chris Lattner 04bf64d43c 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 4ac607332d 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 fc74e8241a 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 cbbf747b7b add a trivial test that vector compares work. 
llvm-svn: 74963
 2009-07-07 22:51:09 +00:00