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add a note, this is actually not too bad to implement.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49466 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2008-04-10 05:54:50 +00:00
parent a825d75f1d
commit 2189c17443
1 changed files with 7 additions and 1 deletions
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8
lib/Target/X86/README-SSE.txt
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@ -472,7 +472,13 @@ _doload64:
addl $12, %esp
ret
instead of movsd from the stack.
instead of movsd from the stack. This is actually not too bad to implement. The
best way to do this is to implement a dag combine that turns
bitconvert(build_pair(load a, load b)) into one load of the right type. The
only trick to this is writing the predicate that determines that a/b are at the
right offset from each other. For the enterprising hacker, InferAlignment is a
helpful place to start poking if interested.
//===---------------------------------------------------------------------===//