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NFC: improve ARM64 isFPImmLegal debug print 

Forking this change from D51706. This just made it easier to understand llc
output with -debug.

llvm-svn: 341504
This commit is contained in:
JF Bastien 2018-09-05 23:38:11 +00:00
parent 7999b4fa48
commit da33900b95
1 changed files with 8 additions and 19 deletions
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27
llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
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@ -5195,40 +5195,29 @@ bool AArch64TargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
// FIXME: We should be able to handle f128 as well with a clever lowering.
if (Imm.isPosZero() && (VT == MVT::f64 || VT == MVT::f32 ||
(VT == MVT::f16 && Subtarget->hasFullFP16()))) {
LLVM_DEBUG(
dbgs() << "Legal fp imm: materialize 0 using the zero register\n");
LLVM_DEBUG(dbgs() << "Legal " << VT.getEVTString() << " imm value: 0\n");
return true;
}
StringRef FPType;
bool IsLegal = false;
SmallString<128> ImmStrVal;
Imm.toString(ImmStrVal);
if (VT == MVT::f64) {
FPType = "f64";
if (VT == MVT::f64)
IsLegal = AArch64_AM::getFP64Imm(Imm) != -1;
} else if (VT == MVT::f32) {
FPType = "f32";
else if (VT == MVT::f32)
IsLegal = AArch64_AM::getFP32Imm(Imm) != -1;
} else if (VT == MVT::f16 && Subtarget->hasFullFP16()) {
FPType = "f16";
else if (VT == MVT::f16 && Subtarget->hasFullFP16())
IsLegal = AArch64_AM::getFP16Imm(Imm) != -1;
}
if (IsLegal) {
LLVM_DEBUG(dbgs() << "Legal " << FPType << " imm value: " << ImmStrVal
<< "\n");
LLVM_DEBUG(dbgs() << "Legal " << VT.getEVTString()
<< " imm value: " << ImmStrVal << "\n");
return true;
}
if (!FPType.empty())
LLVM_DEBUG(dbgs() << "Illegal " << FPType << " imm value: " << ImmStrVal
<< "\n");
else
LLVM_DEBUG(dbgs() << "Illegal fp imm " << ImmStrVal
<< ": unsupported fp type\n");
LLVM_DEBUG(dbgs() << "Illegal " << VT.getEVTString()
<< " imm value: " << ImmStrVal << "\n");
return false;
}