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[WebAssembly] Implement isCheapToSpeculateCtlz and isCheapToSpeculateCttz.

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This unbreaks test/CodeGen/WebAssembly/i32.ll and
test/CodeGen/WebAssembly/i64.ll after r224899.

llvm-svn: 253617
This commit is contained in:
Dan Gohman 2015-11-19 23:04:59 +00:00
parent 395b71970b
commit 73ba14a388
2 changed files with 12 additions and 0 deletions
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10
lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
View File

@ -228,6 +228,16 @@ WebAssemblyTargetLowering::getRegForInlineAsmConstraint(
return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
}
bool WebAssemblyTargetLowering::isCheapToSpeculateCttz() const {
// Assume ctz is a relatively cheap operation.
return true;
}
bool WebAssemblyTargetLowering::isCheapToSpeculateCtlz() const {
// Assume clz is a relatively cheap operation.
return true;
}
//===----------------------------------------------------------------------===//
// WebAssembly Lowering private implementation.
//===----------------------------------------------------------------------===//

2
lib/Target/WebAssembly/WebAssemblyISelLowering.h
View File

@ -52,6 +52,8 @@ private:
std::pair<unsigned, const TargetRegisterClass *>
getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint, MVT VT) const override;
bool isCheapToSpeculateCttz() const override;
bool isCheapToSpeculateCtlz() const override;
SDValue LowerCall(CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const override;