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Don't attempt to create VZEXT_LOAD out of an extload. This an issue where the

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code generator would do something like this:

f64 = load f32 <anyext>, f32mem
v2f64 = insertelt undef, %0, 0
v2f64 = insertelt %1, 0.0, 1

into 

v2f64 = vzext_load f32mem

which on x86 is movsd, when you really wanted a cvtss2sd/movsd pair.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51624 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2008-05-28 00:24:25 +00:00
parent ed185d6e96
commit f7333bf4a2
1 changed files with 5 additions and 0 deletions
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5
lib/Target/X86/X86ISelLowering.cpp
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@ -6324,6 +6324,11 @@ static SDOperand PerformBuildVectorCombine(SDNode *N, SelectionDAG &DAG,
// Transform it into VZEXT_LOAD addr.
LoadSDNode *LD = cast<LoadSDNode>(Base);
// Load must not be an extload.
if (LD->getExtensionType() != ISD::NON_EXTLOAD)
return SDOperand();
return DAG.getNode(X86ISD::VZEXT_LOAD, VT, LD->getChain(), LD->getBasePtr());
}