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| author | Chris Lattner <sabre@nondot.org> | 2008-04-10 05:54:50 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-04-10 05:54:50 +0000 |
| commit | 2189c1744398958407f6802cd07177a292cc1416 (patch) | |
| tree | 2f91c975f8fca6ef1cd61ed4c94b9a41a608f2a4 /lib/Target/X86 | |
| parent | a825d75f1dab354135a6608fb78640b8f844df20 (diff) | |
| download | external_llvm-2189c1744398958407f6802cd07177a292cc1416.zip external_llvm-2189c1744398958407f6802cd07177a292cc1416.tar.gz external_llvm-2189c1744398958407f6802cd07177a292cc1416.tar.bz2 | |
add a note, this is actually not too bad to implement.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49466 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/X86')
| -rw-r--r-- | lib/Target/X86/README-SSE.txt | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt index bbd93bf..5cccfa8 100644 --- a/lib/Target/X86/README-SSE.txt +++ b/lib/Target/X86/README-SSE.txt @@ -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. + //===---------------------------------------------------------------------===// |