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a couple of miscellaneous things.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26625 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-09 01:39:46 +00:00
parent 5a7a9e5386
commit 181b9c6a2a
1 changed files with 18 additions and 0 deletions
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18
lib/Target/X86/README.txt
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@ -566,3 +566,21 @@ LBB_foo_3: # no_exit
jb LBB_foo_3 # no_exit
//===---------------------------------------------------------------------===//
Codegen:
if (copysign(1.0, x) == copysign(1.0, y))
into:
if (x^y & mask)
when using SSE.
//===---------------------------------------------------------------------===//
Optimize this into something reasonable:
x * copysign(1.0, y) * copysign(1.0, z)
//===---------------------------------------------------------------------===//
Optimize copysign(x, *y) to use an integer load from y.
//===---------------------------------------------------------------------===//