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[Mips] Mark function calls as possibly changing FCSR (FCR31) #170314

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[Mips] Mark function calls as possibly changing FCSR (FCR31) #170314

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5 changes: 5 additions & 0 deletions llvm/lib/Target/Mips/MipsISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3060,6 +3060,11 @@ SDValue MipsTargetLowering::lowerSTRICT_FP_TO_INT(SDValue Op,
return DAG.getMergeValues({Result, Op.getOperand(0)}, Loc);
}

ArrayRef<MCPhysReg> MipsTargetLowering::getRoundingControlRegisters() const {
static const MCPhysReg RCRegs[] = {Mips::FCR31};
return RCRegs;
}

//===----------------------------------------------------------------------===//
// Calling Convention Implementation
//===----------------------------------------------------------------------===//
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2 changes: 2 additions & 0 deletions llvm/lib/Target/Mips/MipsISelLowering.h
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Expand Up @@ -719,6 +719,8 @@ class TargetRegisterClass;
return true;
}

ArrayRef<MCPhysReg> getRoundingControlRegisters() const override;

/// Emit a sign-extension using sll/sra, seb, or seh appropriately.
MachineBasicBlock *emitSignExtendToI32InReg(MachineInstr &MI,
MachineBasicBlock *BB,
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11 changes: 11 additions & 0 deletions llvm/test/CodeGen/Mips/strict-fp-func.ll
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@@ -0,0 +1,11 @@
; RUN: llc -mtriple=mips -stop-after=finalize-isel %s -o - | FileCheck %s

define float @func_02(float %x, float %y) strictfp nounwind {
; CHECK-LABEL: name: func_02
; CHECK: JAL @func_01, {{.*}}, implicit-def $fcr31
%call = call float @func_01(float %x) strictfp
%res = call float @llvm.experimental.constrained.fadd.f32(float %call, float %y, metadata !"round.dynamic", metadata !"fpexcept.ignore") strictfp
ret float %res
}

declare float @func_01(float)
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