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9 Commits

Author SHA1 Message Date
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 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
Craig Topper e57b49ee16 Add mcpu to tests to prevent them from using AVX instructions on Sandy Bridge after r155618. 
llvm-svn: 155696
 2012-04-27 07:11:58 +00:00
NAKAMURA Takumi eff7bdb792 Relax expressions and add explicit triplets -linux and -win32. 
llvm-svn: 126197
 2011-02-22 07:19:20 +00:00
Dan Gohman 51e6d9bbf6 Apply the SSE dependence idiom for SSE unary operations to 
SD instructions too, in addition to SS instructions. And
add a comment about it.

llvm-svn: 108191
 2010-07-12 20:46:04 +00:00
Benjamin Kramer 3bbc52ce3e Fix some tests that didn't test anything. 
llvm-svn: 106954
 2010-06-26 20:05:06 +00:00
Evan Cheng 71d7eaa87e Remove target attribute break-sse-dep. Instead, do not fold load into sse partial update instructions unless optimizing for size. 
llvm-svn: 91910
 2009-12-22 17:47:23 +00:00
Evan Cheng 4cf30b72bf On recent Intel u-arch's, folding loads into some unary SSE instructions can 
be non-optimal. To be precise, we should avoid folding loads if the instructions
only update part of the destination register, and the non-updated part is not
needed. e.g. cvtss2sd, sqrtss. Unfolding the load from these instructions breaks
the partial register dependency and it can improve performance. e.g.

movss (%rdi), %xmm0
cvtss2sd %xmm0, %xmm0

instead of
cvtss2sd (%rdi), %xmm0

An alternative method to break dependency is to clear the register first. e.g.
xorps %xmm0, %xmm0
cvtss2sd (%rdi), %xmm0

llvm-svn: 91672
 2009-12-18 07:40:29 +00:00