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V_SET0 has no side effects.

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TableGen will mark any pattern-less instruction as having unmodeled side
effects. This is extra bad for V_SET0 which gets rematerialized a lot.

This was part of the cause for PR11125, but the real bug was fixed
in r141923.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141924 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-10-14 00:39:50 +00:00
parent a80444f88d
commit 0a951fba75
1 changed files with 1 additions and 1 deletions
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2
lib/Target/X86/X86InstrSSE.td
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@ -266,7 +266,7 @@ let isReMaterializable = 1, isAsCheapAsAMove = 1, isCodeGenOnly = 1,
// We set canFoldAsLoad because this can be converted to a constant-pool
// load of an all-zeros value if folding it would be beneficial.
let isReMaterializable = 1, isAsCheapAsAMove = 1, canFoldAsLoad = 1,
isPseudo = 1 in {
isPseudo = 1, neverHasSideEffects = 1 in {
def V_SET0 : I<0, Pseudo, (outs VR128:$dst), (ins), "", []>;
}