5 Commits

Author	SHA1	Message	Date
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