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[ARM] Mark function calls as possibly changing FPSCR #160699

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[ARM] Mark function calls as possibly changing FPSCR #160699

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f26ecda
[ARM] Mark function calls as possibly changing FPSCR
Varnike Aug 27, 2025
107563a
fixup: use FPSCR_RM instead of FPSCR and correct test target
Varnike Sep 29, 2025
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5 changes: 5 additions & 0 deletions llvm/lib/Target/ARM/ARMISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -22004,6 +22004,11 @@ bool ARMTargetLowering::isComplexDeinterleavingOperationSupported(
ScalarTy->isIntegerTy(32));
}

ArrayRef<MCPhysReg> ARMTargetLowering::getRoundingControlRegisters() const {
static const MCPhysReg RCRegs[] = {ARM::FPSCR_RM};
return RCRegs;
}

Value *ARMTargetLowering::createComplexDeinterleavingIR(
IRBuilderBase &B, ComplexDeinterleavingOperation OperationType,
ComplexDeinterleavingRotation Rotation, Value *InputA, Value *InputB,
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2 changes: 2 additions & 0 deletions llvm/lib/Target/ARM/ARMISelLowering.h
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Expand Up @@ -1005,6 +1005,8 @@ class VectorType;

bool isUnsupportedFloatingType(EVT VT) const;

ArrayRef<MCPhysReg> getRoundingControlRegisters() const override;

SDValue getCMOV(const SDLoc &dl, EVT VT, SDValue FalseVal, SDValue TrueVal,
SDValue ARMcc, SDValue Flags, SelectionDAG &DAG) const;
SDValue getARMCmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
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13 changes: 13 additions & 0 deletions llvm/test/CodeGen/ARM/strict-fp-func.ll
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@@ -0,0 +1,13 @@
; RUN: llc -mtriple arm-none-eabi -stop-after=finalize-isel %s -o - | FileCheck %s

define float @func_02(float %x, float %y) strictfp nounwind {
%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
}
; CHECK-LABEL: name: func_02
; CHECK: BL @func_01, {{.*}}, implicit-def $fpscr_rm


declare float @func_01(float)
declare float @llvm.experimental.constrained.fadd.f32(float, float, metadata, metadata)