// Matches x -> [scast -> scast] -> y, replacing the second scast with the
  // value of x if the casts invert each other.
  auto srcScastOp = getArg().getDefiningOp<StorageCastOp>();
  if (!srcScastOp || srcScastOp.getArg().getType() != getType())
    return OpFoldResult();
  return srcScastOp.getArg();
}

/// The quantization specification should match the expressed type.

				gp := *(**g)(unsafe.Pointer(s.base()))
				return gp
			}
			return nil
		}
	}
	return getg()
}

// sigtrampgo is called from the signal handler function, sigtramp,
// written in assembly code.
// This is called by the signal handler, and the world may be stopped.
//
// It must be nosplit because getg() is still the G that was running
// (if any) when the signal was delivered, but it's (usually) called

            RequirementMatcher matcher = provides.get(key);

            if (matcher == null) {
                getLog().debug("Toolchain {} is missing required property: {}", this, key);
                return false;
            }
            if (!matcher.matches(requirement.getValue())) {
                getLog().debug("Toolchain {} doesn't match required property: {}", this, key);
                return false;
            }
        }

LogicalResult QuantizedConstRewrite::matchAndRewrite(
    QuantizeCastOp qbarrier, PatternRewriter &rewriter) const {
  Attribute value;

  // Is the operand a constant?
  if (!matchPattern(qbarrier.getArg(), m_Constant(&value))) {
    return failure();
  }

  // Does the qbarrier convert to a quantized type. This will not be true
  // if a quantized type has not yet been chosen or if the cast to an equivalent

		return args, err
	}

	getCfg := func(cfgParam string) string {
		// As parameters are already validated, we skip checking
		// if the config param was found.
		val, _, _ := s.ResolveConfigParam(config.PolicyPluginSubSys, config.Default, cfgParam, false)
		return val
	}

	pluginURL := getCfg(URL)
	if pluginURL == "" {
		return args, nil
	}

	// FreeBSD users are running a patched kernel. See issue #15658.
	if gp := getg(); !isarchive && !islibrary && gp.m == &m0 && gp == gp.m.g0 {
		st := stackt{ss_flags: _SS_DISABLE}
		sigaltstack(&st, nil)
	}

	minitSignals()
}

// Called from dropm to undo the effect of an minit.
//
//go:nosplit
func unminit() {
	unminitSignals()
	getg().m.procid = 0
}

  LogicalResult matchAndRewrite(quantfork::DequantizeCastOp dq_op,
                                PatternRewriter& rewriter) const override {
    auto q_op = dq_op.getArg().getDefiningOp<quantfork::QuantizeCastOp>();
    if (!q_op) return failure();

    dq_op.replaceAllUsesWith(q_op.getArg());
    return success();
  }
};

class QuantizeSameScaleOpsPattern
    : public OpRewritePattern<quantfork::DequantizeCastOp> {
 public:

	sa.sa_sigaction = fn
	sigaction(i, &sa, nil)
}

//go:nosplit
//go:nowritebarrierrec
func setsigstack(i uint32) {
	throw("setsigstack")
}

//go:nosplit
//go:nowritebarrierrec
func getsig(i uint32) uintptr {
	var sa sigactiont
	sigaction(i, nil, &sa)
	return sa.sa_sigaction
}

// setSignalstackSP sets the ss_sp field of a stackt.
//
//go:nosplit

    if (!tensor_type) return cast_op.getArg();

    auto attr_names = tensor_type.getAttrKeys();
    if (attr_names.empty() || attr_names.size() > 1) return cast_op.getArg();
    StringRef tfr_type_attr = attr_names[0].getValue();
    if (!fixed_elt_type_attrs_.contains(tfr_type_attr)) return cast_op.getArg();

    Type result_elt_type = GetFixedElementType(tfr_type_attr, rewriter);

    b.setInsertionPoint(op);
    if (auto dq = llvm::dyn_cast<quantfork::DequantizeCastOp>(op)) {
      auto dcast = b.create<DequantizeOp>(dq.getLoc(), dq.getResult().getType(),
                                          dq.getArg());
      dq.getResult().replaceAllUsesWith(dcast);
      if (auto extra_attr = op->getAttr(mlir::quant::kVolatileOpAttrName)) {
        dcast->setAttr(mlir::quant::kVolatileOpAttrName, extra_attr);
      }
      dq.erase();