github.com/llir/llvm@v0.3.6/asm/inst_unary.go (about)

     1  package asm
     2  
     3  import (
     4  	"fmt"
     5  
     6  	"github.com/llir/ll/ast"
     7  	"github.com/llir/llvm/ir"
     8  	"github.com/pkg/errors"
     9  )
    10  
    11  // === [ Create IR ] ===========================================================
    12  
    13  // newFNegInst returns a new IR fneg instruction (without body but with type)
    14  // based on the given AST fneg instruction.
    15  func (fgen *funcGen) newFNegInst(ident ir.LocalIdent, old *ast.FNegInst) (*ir.InstFNeg, error) {
    16  	typ, err := fgen.gen.irType(old.X().Typ())
    17  	if err != nil {
    18  		return nil, errors.WithStack(err)
    19  	}
    20  	return &ir.InstFNeg{LocalIdent: ident, Typ: typ}, nil
    21  }
    22  
    23  // === [ Translate AST to IR ] =================================================
    24  
    25  // --- [ fneg ] ----------------------------------------------------------------
    26  
    27  // irFNegInst translates the given AST fneg instruction into an equivalent IR
    28  // instruction.
    29  func (fgen *funcGen) irFNegInst(new ir.Instruction, old *ast.FNegInst) error {
    30  	inst, ok := new.(*ir.InstFNeg)
    31  	if !ok {
    32  		panic(fmt.Errorf("invalid IR instruction for AST instruction; expected *ir.InstFNeg, got %T", new))
    33  	}
    34  	// X operand.
    35  	x, err := fgen.irTypeValue(old.X())
    36  	if err != nil {
    37  		return errors.WithStack(err)
    38  	}
    39  	inst.X = x
    40  	// (optional) Fast math flags.
    41  	inst.FastMathFlags = irFastMathFlags(old.FastMathFlags())
    42  	// (optional) Metadata.
    43  	md, err := fgen.gen.irMetadataAttachments(old.Metadata())
    44  	if err != nil {
    45  		return errors.WithStack(err)
    46  	}
    47  	inst.Metadata = md
    48  	return nil
    49  }