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Another entry about shuffles.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27245 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2006-03-29 03:03:46 +00:00
parent 4f5633883b
commit c999c745c0
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6
lib/Target/X86/README.txt
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@ -667,3 +667,9 @@ directly %esp[0] if there are no other uses.
Use movhps to update upper 64-bits of a v4sf value. Also movlps on lower half
of a v4sf value.
//===---------------------------------------------------------------------===//
Better codegen for vector_shuffles like this { x, 0, 0, 0 } or { x, 0, x, 0}.
Perhaps use pxor / xorp* to clear a XMM register first?