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Add a note about SSE4.1 roundss/roundsd.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125438 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2011-02-12 17:58:16 +00:00
parent 609d54ee1e
commit d800cf0a50
1 changed files with 11 additions and 0 deletions
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11
lib/Target/X86/README-SSE.txt
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@ -923,4 +923,15 @@ The insertps's of $0 are pointless complex copies.
//===---------------------------------------------------------------------===//
If SSE4.1 is available we should inline rounding functions instead of emitting
a libcall.
floor: roundsd $0x01, %xmm, %xmm
ceil: roundsd $0x02, %xmm, %xmm
and likewise for the single precision versions.
Currently, SelectionDAGBuilder doesn't turn calls to these functions into the
corresponding nodes and some targets (including X86) aren't ready for them.
//===---------------------------------------------------------------------===//