diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2008-03-05 01:30:59 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2008-03-05 01:30:59 +0000 |
| commit | 6fd599fa6916bd9438dbea7994cf2437bdf4ab8c (patch) | |
| tree | 3c6d40842c57c1ed5309750a1c82a8dd107f107f /lib/CodeGen | |
| parent | d19189e9905e14a4001a8ca6fc4effb6a3f88e45 (diff) | |
Add a target lowering hook to control whether it's worthwhile to compress fp constant.
For x86, if sse2 is available, it's not a good idea since cvtss2sd is slower than a movsd load and it prevents load folding. On x87, it's important to shrink fp constant since fldt is very expensive.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47931 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index c1bf2188b1..24dd2fd3bd 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -504,7 +504,8 @@ static SDOperand ExpandConstantFP(ConstantFPSDNode *CFP, bool UseCP, if (CFP->isValueValidForType(SVT, CFP->getValueAPF()) && // Only do this if the target has a native EXTLOAD instruction from // smaller type. - TLI.isLoadXLegal(ISD::EXTLOAD, SVT)) { + TLI.isLoadXLegal(ISD::EXTLOAD, SVT) && + TLI.ShouldShrinkFPConstant(VT)) { const Type *SType = MVT::getTypeForValueType(SVT); LLVMC = cast<ConstantFP>(ConstantExpr::getFPTrunc(LLVMC, SType)); VT = SVT; |