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| author | Amara Emerson <aemerson@apple.com> | 2018-01-27 07:07:20 +0000 |
|---|---|---|
| committer | Amara Emerson <aemerson@apple.com> | 2018-01-27 07:07:20 +0000 |
| commit | 77a5c965607757d3c0f7e83525a41f655bb5db89 (patch) | |
| tree | cbaf0b35447e80b74083b5e58a094d97a77a9df9 | |
| parent | f86be121820b6f133b3fa609c4188756f370f3f1 (diff) | |
| download | bcm5719-llvm-77a5c965607757d3c0f7e83525a41f655bb5db89.tar.gz bcm5719-llvm-77a5c965607757d3c0f7e83525a41f655bb5db89.zip | |
[GlobalISel][Legalizer] Convert the FP constants to the right APFloat type for G_FCONSTANT.
We weren't converting the immediate ConstantFP during legalization, which caused
the wrong bit patterns to be emitted for half type FP constants.
Fixes PR36106.
llvm-svn: 323582
| -rw-r--r-- | llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp | 19 | ||||
| -rw-r--r-- | llvm/test/CodeGen/AArch64/GlobalISel/legalize-constant.mir | 2 |
2 files changed, 19 insertions, 2 deletions
diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp index d8dc936eef2..06e3c75e081 100644 --- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp +++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp @@ -715,7 +715,24 @@ LegalizerHelper::widenScalar(MachineInstr &MI, unsigned TypeIdx, LLT WideTy) { } case TargetOpcode::G_FCONSTANT: { unsigned DstExt = MRI.createGenericVirtualRegister(WideTy); - MIRBuilder.buildFConstant(DstExt, *MI.getOperand(1).getFPImm()); + const ConstantFP *CFP = MI.getOperand(1).getFPImm(); + APFloat Val = CFP->getValueAPF(); + LLVMContext &Ctx = MIRBuilder.getMF().getFunction().getContext(); + auto LLT2Sem = [](LLT Ty) { + switch (Ty.getSizeInBits()) { + case 32: + return &APFloat::IEEEsingle(); + break; + case 64: + return &APFloat::IEEEdouble(); + break; + default: + llvm_unreachable("Unhandled fp widen type"); + } + }; + bool LosesInfo; + Val.convert(*LLT2Sem(WideTy), APFloat::rmTowardZero, &LosesInfo); + MIRBuilder.buildFConstant(DstExt, *ConstantFP::get(Ctx, Val)); MIRBuilder.buildFPTrunc(MI.getOperand(0).getReg(), DstExt); MI.eraseFromParent(); return Legalized; diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/legalize-constant.mir b/llvm/test/CodeGen/AArch64/GlobalISel/legalize-constant.mir index 4ed84ed79bb..c3ed3316ad3 100644 --- a/llvm/test/CodeGen/AArch64/GlobalISel/legalize-constant.mir +++ b/llvm/test/CodeGen/AArch64/GlobalISel/legalize-constant.mir @@ -75,7 +75,7 @@ body: | ; CHECK: %w0 = COPY [[C]](s32) ; CHECK: [[C1:%[0-9]+]]:_(s64) = G_FCONSTANT double 2.000000e+00 ; CHECK: %x0 = COPY [[C1]](s64) - ; CHECK: [[C2:%[0-9]+]]:_(s32) = G_FCONSTANT half 0xH0000 + ; CHECK: [[C2:%[0-9]+]]:_(s32) = G_FCONSTANT float 0.000000e+00 ; CHECK: [[FPTRUNC:%[0-9]+]]:_(s16) = G_FPTRUNC [[C2]](s32) ; CHECK: [[ANYEXT:%[0-9]+]]:_(s32) = G_ANYEXT [[FPTRUNC]](s16) ; CHECK: %w0 = COPY [[ANYEXT]](s32) |
